The URL can be used to link to this page

Browse Search

Home My WebLink About20222104.tiffThe Honorable Scott James Chairperson, Weld County Board of Commissioners 1150 O Street Greeley, Colorado 80631 Dear Mr. James: U.S. Department of Homeland Security Region VIII Denver Federal Center, Building 710 P.O. Box 25267 Denver, CO 80225-0267 FEMA March 23, 2022 REVISED PRELIM TRANS -CEO Community Name: Weld County, Colorado (Unincorporated Areas) Community No.: 080266 On September 17, 2020, the Department of Homeland Security's Federal Emergency Management Agency (FEMA) provided your community with Preliminary copies of the Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for Weld County, Colorado and Incorporated Areas. The Preliminary has been revised to reflect appropriate changes based on our technical evaluation of available data. A summary of the changes made to the FIRM and FIS report is enclosed. To assist us in processing the revised FIRM and FIS report in a timely manner, we request that your community review the enclosed copies and submit any changes or comments within 30 days of the date of this letter. Any comments received during this 30 -day period will be reviewed and incorporated as appropriate before final publication of the FIRM and FIS report. Comments may be sent to: Additional copy to: Christine Gaynes, FEMA Region VIII Denver Federal Center, Building 710 Post Office Box 25267 Denver, Colorado 80225-0267 Christine.gaynes5lifema.dhs.gov David Sutley, Regional Service Center, STARR II Dewberry, 990 South Broadway, Suite 400 Denver, Colorado 80209 dsutley@Dewberry.com C o r -w wv, c o0+ ; o rt5 7 /2S 1:2.2 cc :p EI'l(RR),PL('rP/DA), Pw(s► IcH/Ea/to) 7/Z/2-2- 2022-2104 Marta Blanco Castano, GISP Flood Mapping Program Assistant Colorado Water Conservation Board 1313 Sherman Street, Room 718 Denver, Colorado 80203 Marta.blancocastano@state.co.us If we do not receive any changes or comments during this 30 -day period, we will initiate final preparation and printing. Your community will be provided with printed copies of the revised FIRM and FIS)report before the effective date. To assist your community in maintaining the FIRM, we have enclosed a Summary of Map Actions (SOMA) to document previous Letters of Map Change (LOMCs) (i.e., Letters of Map Amendment [LOMAs], Letters of Map Revision [LOMRs]) that will be superseded when the FIRM becomes effective. Information on LOMCs is presented in the following four categories: (1) LOMCs for which results have been included on the FIRM; (2) LOMCs for which results could not be shown on the FIRM because of scale limitations or because the LOMC issued had determined that the lots or structures involved were outside the Special Flood Hazard Area as shown on the FIRM; (3) LOMCs for which results have not been included on the FIRM because the flood hazard information on which the original determinations were based is being superseded by new flood hazard information; and (4) LOMCs issued for multiple lots or structures where the determination for one or more of the lots or structures cannot be revalidated through an administrative process like the LOMCs in Category 2 above. LOMCs in Category 2 will be revalidated through a single letter that reaffirms the validity of a previously issued LOMC; the letter will be sent to your community shortly before the effective date of the FIRM and will become effective one day after the FIRM becomes effective. For the LOMCs listed in Category 4, we will review the data previously submitted for the LOMA or LOMR request and issue a new determination for the affected properties after the FIRM becomes effective upon request. After the 30 -day review and appeal periods have ended and we have addressed all comments, we will initiate final preparation of the FIRM and FIS Report. The new FIRM and FIS Report for your community will become effective approximately 7 to 10 months later. Before the effective date, you will be notified in writing of the official FIRM and FIS Report effective date and asked to adopt floodplain ordinances or modify existing ordinances as necessary that correspond with the new FIRM or FIS Report. If you or other community officials have any questions regarding floodplain ordinances, you may raise them with our FEMA Regional Office or you may discuss those issues with your State NFIP Coordinator. A few months prior to the effective date, we will mail one set of printed copies of the finalized FIRM and FIS Report and digital copies of the map and report products. Your community's comments on the Preliminary FIRM panels and FIS Report are an important part of our review process, and we will consider them carefully before we publish the FIRM and FIS Report in their final form. If you have any questions regarding the Preliminary copies of the FIRM and FIS report, please contact the Consultation Coordination Officer designated for your community by telephone at (303) 235 4830. If you have general questions about mapping issues, please call our FEMA Mapping and Insurance eXchange (FMIX), toll free, at (877) 336-2627 (877-FEMA MAP) or e-mail our FMIX staff at FEMA-FMIX@fema.dhs.gov. Sincerely, Jeanine D. Petterson FEMA Region VIII Mitigation Division Director Enclosures: Revised Preliminary FIS Report Revised Preliminary FIRM Panels Revised Preliminary SOMA cc: Tom Parko, Planning Director Community Map Repository Doug Mahan, State NFIP Coordinator Marta Blanco Castano, GISP Flood Mapping Program Assistant Christine Gaynes, FEMA Region VIII Risk MAP Specialist Matt Buddie, FEMA Region VIII FM&I Specialist SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY Community No: 080266 To assist your community in maintaining the Flood Insurance Rate Map (FIRM), we have summarized below the effects of the enclosed revised FIRM panels(s) on previously issued Letter of Map Change (LOMC) actions (i.e., Letters of Map Revision (LOMRs), Letter of Map Revision based on Fill (LOMR-Fs), and Letters of Map Amendment (LOMAs)). 1. LOMCs Incorporated The modifications effected by the LOMCs listed below have been reflected on the Preliminary copies of the revised FIRM panels. In addition, these LOMCs will remain in effect until the revised FIRM becomes effective. LOMC Case No. Date Issued Project Identifier Original Panel Current Panel LOMR 15-08-0573P 07/14/2016 EATON DRAW HYDROLOGIC AND HYDRAULIC UPDATE 08123C1529E 08123C1533E 08123C1535E 08123C1529F 08123C1533F 08123C1535E1 LOMR 16-08-0665P 06/20/2017 WELD COUNTY ROAD 49 EXTENTION 08123C1561E 08123C1561F LOMR 17-08-1017X 12/22/2017 WELD COUNTY ROAD EXTENSION, UPDATE to LOMR (17-08-0665P) 08123C1561E 08123C1561F LOMR 17-08-1256P 07/26/2018 Northern Treatment Plant - South Platte LOMR 08123C2115E 08123C2115F LOMR 19-08-1058P 02/01/2021 SH 60 & SH 257 Bridge Replacement & LTR Channelization Project 08123C1684E 08123C1703E 08123C1684F 08123C1703F LOMR 21-08-0099P 08/30/2021 GWIP LOMR 08123C1503E 08123C1504E 08123C1503F 08123C1504F 1. Although a portion of LOMR 15-08-0573P falls within the scope of this map revision, panel 08123C1535E was not revised. 2. LOMCs Not Incorporated The modifications effected by the LOMCs listed below are either not located on revised FIRM panels, or have not been reflected on the Preliminary copies of the revised FIRM panels because of scale limitations or because the LOMC issued had determined that the lot(s) or structure(s) involved were outside the Special Flood Hazard Area, as shown on the FIRM. These LOMCs will be revalidated free of charge 1 day after the revised FIRM becomes effective through a single revalidation letter that reaffirms the validity of the previous LOMCs. Page 1 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY 2A. LOMCs on Revised Panels Community No: 080266 LOMC Case No. Date Issued Project Identifier Original Panel Current Panel LOMR-F 96-08-163A 06/28/1996 WESTGATE ESTATES, LOT 22 -- 5222 BROME COURT 0802660960D 08123C2058F LOMA 98-08-448A 09/18/1998 15600 WELD COUNTY ROAD 396 -- PORTION OF SECTION 34, T5N, R33W, 6TH P.M. 0802660750C 08123C1707F LOMR-F 98-08-405A 10/02/1998 LUPTON MEADOWS, LOT 1 -- 9999 WELD COUNTY ROAD 25 0802660866C 08123C1915F LOMA 01-08-312A 08/01/2001 370 WELD COUNTY ROAD 16 1/2 -- EXEMPTION PLAT, LOT B, PORTION OF SECTION 30, T2N, R68W, 6TH P.M. 0802660850C 08123C2056F LOMR-F 01-08-261A 10/10/2001 32235 WELD COUNTY ROAD 15; PORTION OF LOT B 0802660605D 08123C1483F LOMA 02-08-157A 06/26/2002 REFLECTION BAY, LOT 3 -- 7167 REFLECTION DRIVE 0802660850C 08123C2056F LOMR-F 02-08-312A 08/26/2002 1019 EAST 16TH STREET -- PORTION OF SECTION 9, T5N, R65W, 6TH P.M. 0802660637C 08123C1541F LOMA 02-08-262A3 10/04/2002 RODGER'S FARM, BLOCKS 1-9 0802660750C 08123C1905F LOMA 03-08-0025A 01/02/2003 PELICAN SHORES, PORTIONS OF SECTION 36, T3N, R68W, 6TH P.M. 0802660855O 08123C1890F LOMA 03-08-0254A 04/25/2003 11665 COUNTY ROAD 32 1/2 -- PORTION OF SECTION 13, T3N, R67W, 6TH P.M. 0802660750C 08123C1905F LOMA 03-08-0614A 10/01/2003 REFLECTION BAY, LOT 4 -- 7227 REFLECTION BAY DRIVE 0802660850C 08123C2056F LOMR-F 04-08-0161A 02/04/2004 4785 COUNTY ROAD 24.75 -- PORTION OF SECTION 2, T2N, R68W, 6TH P.M. 0802660855C 08123C1890F LOMA 04-08-0298A 03/10/2004 1435 COUNTY ROAD 16.5 -- PORTION OF SECTION 29, T2N, R68W, 6TH P.M. 0802660850C 08123C2057F LOMA 05-08-0009A 11/17/2004 31256 COUNTY ROAD 59 -- PORTION OF SECTION 25, T6N, R64W, 6TH P.M. 0802660635C 08123C1575F LOMA 05-08-0011A 11/23/2004 LIGHTHOUSE COVE, LOT 3 -- 9928 HARBOR DRIVE 0802660850C 08123C1870F LOMR-F 04-08-0753A 12/28/2004 MEADOW VALE FARM P.U.D. 3RD FILING, BLOCK 1, LOTS 1-3; BLOCK 2, LOTS 1-3; BLOCK 3, LOTS 1, 3-8 0802660850C 08123C1870F Page 2 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY Community No: 080266 LOMC Case No. Date Issued Project Identifier Original Panel Current Panel LOMA 05-08-0070A 01/05/2005 24507 STATE HIGHWAY 392 -- PORTION OF SECTION 18, T6N, R64W, 6TH P.M. 0802660635C 08123C1575F LOMA 05-08-0332A 03/28/2005 5792 COUNTY ROAD 26 0802660855C 08123C1890F LOMR-F 05-08-0670M 10/06/2005 RECORDED EXEMPTION NO. 2767, LOT B 0802660605O 08123C1481 F LOMA 06 08-B623A5 09/14/2006 NORTHCREEK AT MEAD, BLOCK 9, LOT 6 --16697 WEST VIEW DRIVE 0802660725C 08123C1860F LOMA 06-08-0002A 10/18/2005 SECTION 2, T2N, R68W, 6TH P.M. -- 4777 W.C.R. 24 3/4 0802660855C 08123C1890F LOMA 06-08-0142A 12/19/2005 9777 WELD COUNTY ROAD 7 -LOT A, RECORDED EXEMPTION 1313-16-RE2330 0802660850C 08123C1890F LOMA 06-08-0141A 02/14/2006 13640 WELD COUNTY ROAD 64 -PORTION OF SECTION 32, T6N, R66W 0802660608D 08123C1508F LOMR-F 06-08-B226A 04/18/2006 LOT A, SECTION 19, T6N, R67W OF THE 6TH P.M. 0802660605O 08123C1481F LOMA 06-08-B702A 10/12/2006 LIGHTHOUSE COVE, LOT 9 - 9951 HARBOR DRIVE 0802660850C 08123C1870F LOMA 07-08-0556A 05/17/2007 379 HIGHWAY 52 -- PORTION OF SECTION 31, T2N, R68W, 6TH P.M. 0802660850C 08123C2058F LOMA 08-08-0610A 12/11/2008 11360 COUNTY ROAD 36 - Sec 12, T3N, R67W, 6th P.M. 0802660750C 08123C1905F LOMA 09-08-0279A 02/10/2009 2462 WELD COUNTY ROAD 21 -- PORTION OF SECTION 23, T1 N, R67W, 6TH P.M. 0802660980C 08123C2115F LOMA 09-08-0426A 04/02/2009 LOTA-- PORTION OF SECTION 6, T1N, R68W, 6TH P.M. 0802660960D 08123C2058F LOMA 09-08-1013A 12/08/2009 LOT B--28847 WRC6Z 0802660635C 08123C1567F LOMA 10-08-0063A 04/20/2010 (70-R) 45363 HIGHWAY 34 -- A PORTION OF SECTION 22, T4N, R61 W, 6TH P.M. 0802660825C 08123C1850F LOMR-F 10-08-1029A2 10/12/2010 (65 -RS) HAUCK PRESERVE MINOR SUBDIVISION, LOT 4 -- 7641 XANADU FARM DRIVE 0802660850C 08123C2057F LOMA 11-08-0234Az 01/12/2011 (70 -RS) LOTA-- 1435 WELD COUNTY ROAD 16 1/2 0802660850C 08123C2057F LOMA 11-08-0821A 08/30/2011 (70 -RS) A PORTION OF SECTION 1, T4N, R66W --17842 WCR 394 0802660775C 08123C1726F Page 3 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY Community No: 080266 LOMC Case No. Date Issued Project Identifier Original Panel Current Panel LOMR-F 12-08-0022A 11/10/2011 PORTION OF SECTION 27, T5N, R63W -- 24965 COUNTY ROAD 69 0802660675C 08123C1820F LOMA 12-08-0124A 12/08/2011 PORTION OF SECTION 32, T3N, R67W -- 7095 WELD COUNTY ROAD 26 3/4 0802660855C 08123C1895F LOMR-F 12-08-0196A 01/31/2012 MEADOW VALE FARM P.U.D., THIRD FILING, BLOCK 3, LOT 2 -- 1756 EDGEWATER PLACE 0802660850C 08123C1870F LOMA 12-08-0876A 09/06/2012 REFLECTION BAY, LOT 1 -- 7107 REFLECTION DRIVE 0802660850C 08123C2056F LOMA 13-08-1319A 10/24/2013 LIGHTHOUSE COVE, PHASE II, LOT 12 -- 9845 SHORELINE DRIVE 0802660850C 08123C1870F LOMA 14-08-0156A 12/10/2013 LIGHTHOUSE COVE, PHASE 2, LOT 11 -- 9849 SHORELINE DRIVE 0802660850C 08123C1870F 08123C1890F LOMA 14-08-1167A 08/07/2014 LIGHTHOUSE COVE, PHASE II, LOT 17 -- 9825 SHORELINE DRIVE 0802660850C 08123C1870F LOMA 15-08-0148A 12/04/2014 LIGHTHOUSE COVE, LOT 1 -- 9974 HARBOR DRIVE 0802660850C 08123C1870F LOMA 15-08-0476A 02/26/2015 COTTONWOOD FALLS PUD, LOT 10 -- 24607 COTTONWOOD LANE 0802660675C 0802660800C 08123C1820F LOMA 15-08-0568A 03/27/2015 LIGHTHOUSE COVE, LOT 2 -- 9952 HARBOR DRIVE 0802660850C 08123C1870F LOMA 15-08-0647A 04/10/2015 LIGHTHOUSE COVE, LOT 10 -- 9977 HARBOR DRIVE 0802660850C 08123C1870F LOMA 15-08-0426A 06/15/2015 LIGHTHOUSE COVE, PHASE II, LOT 18 -- 9821 SHORELINE DRIVE 0802660850C 08123C1870F LOMA 15-08-1154A 07/29/2015 4699 Highway 85 0802660981C 08123C2104F LOMA 16-08-0190A 01/21/2016 PORTION OF SECTION 32, T6M, R66W -- 13648 CR 64 08123C1508E 08123C1508F LOMA 16-08-0635A1 04/28/2016 RS -1023, UNION COLONY, LOT 2 -- 1108 H STREET 08123C1529E 08123C1529F LOMA 16-08-0686A1 05/04/2016 STONEYBROOK FILING NO. 1, BLOCK 1, LOT 1 -- 435 NORTH 35TH AVENUE #111 08123C1536E 08123C1536F LOMR-F 16-08-1144A 08/25/2016 LOT B -- 6461 STATE HIGHWAY 392 08123C1481E 08123C1481F Page 4 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY Community No: 080266 LOMC Case No. Date Issued Project Identifier Original Panel Current Panel LOMA 17-08-0638A 04/11/2017 LIGHTHOUSE COVE, LOT 8 -- 9929 HARBOR DRIVE 08123C1870E 08123C1870F LOMA 18-08-0443A 02/12/2018 SUBDIVISION EXEMPTION NO. 741, PARCELA- 4795 WCR 24 3/4 08123C1890E 08123C1890F LOMR-F 18-08-0771A 08/02/2018 SECTION 12, T3N, R67W -- 16134 WELD COUNTY ROAD 23 08123C1905E 08123C1905F LOMA 19-08-0087A 12/13/2018 SECTION 23, T1 N, R67W -- 2532 & 2543 WELD COUNTY ROAD 21 08123C2115E 08123C1905F LOMR-FW 21-08-0953A 08/27/2021 CONTINENTAL VIEW POND P.U.D., LOT 2 -- 7257 COUNTY ROAD 3 1/4 08123C2060E 08123C2056F 1. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the City of Greeley due to annexations. 2. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the Town of Frederick due to annexations. 3. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the Town of Platteville due to annexations. 4. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the Town of Windsor due to annexations. 5. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the Town of Mead due to annexations. Page 5 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY 2B. LOMCs on Unrevised Panels Community No: 080266 LOMC Case No. I Date I Issued Project Identifier I Original I Panel l Current Panel LOMR-F 96-08-247A 08/13/1996 36125 WELD COUNTY ROAD 43 -- PORTION OF SECTION 33, T7N, R65W 0802660489C 08123C1250E LOMR-F 00-08-087A3 03/09/2000 WESTWOOD VILLAGE 2ND FILING, PHASE 2, BLOCK 1, LOTS 1-7; BLOCK 2, LOTS 1-31; BLOCK 4, LOTS 1-4; BLOC 0802660605D 08123C1482E LOMA 02-08-065A 12/14/2001 8257 COUNTY ROAD 47 1/2 -- LOT A, RECORDED EXEMPTION NO. 1307-24-3-RE2127, SECTION 24, T2N, R65W, 6 0802660900C 58123C2155E LOMA 02-08-318A 07/03/2002 13940 COUNTY ROAD 78 -- PORTION OF SECTION 29, T7N, R66W, 6TH P.M. 0802660475D 08123C1225E LOMA 03-08-0404A 06/27/2003 22985 COUNTY ROAD 86 -- PORTION OF SECTION 35, T8N, R65W, 6TH P.M. 0802660480C 08123C1275E LOMA 03-08-0429A 07/16/2003 13905 COUNTY ROAD 78 -- PORTION OF SECTION 20, T7N, R66W, 6TH P.M. 0802660475D 08123C1225E LOMA 03-08-0366A 10/22/2003 35347 COUNTY ROAD 39 -- PORTION OF SECTION 6, T6N, R65W, 6TH P.M. 0802660488C 08123C1239E LOMA 05-08-0067A 12/13/2004 28339 WEST COUNTY ROAD 44 -- PORTION OF SECTION 14, T1 N, R64W 0802660775C 08123C1775E LOMA 05-08-0558A 08/11/2005 510 NORTH 3RD AVENUE, A PORT OF SEC 12, T7N, R66W, 6TH P.M. 0802660480C 08123C1250E LOMA 07-08-0478A 06/26/2007 15575 COUNTY ROAD 90 -- PORTION OF SECTION 22, TBN, R66W (APN: 055322400011) 0802660325C 08123C0919E LOMA 08-08-0917A 01/15/2009 28496 WCR 44 -- PORTION OF SECTIONS 14 AND 23, T4N, R64W, 6TH PM 0802660775C 08123C1775E LOMR-F 08-08-0916A 02/17/2009 28519 WCR 44 -- PORTION OF SE/4 SECTION 11, T4N, R64W 0802660775C 08123C1775E LOMA 09-08-0413A 04/07/2009 36401 COUNTY ROAD 43 -- PORTION OF SECTION 33, T7N, R65W, 6TH P.M. 0802660487C 08123C1250E LOMA 10-08-0706A 07/08/2010 (70 -RS) LOT B -- 5198 CR 49 0802661025C 08123C2155E Page 6 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY Community No: 080266 LOMC I Case No. I Date Issued I Project Identifier I OrigiPanel pannal I Current LOMA 12-08-0562A2 05/22/2012 WEST FORK VILLAGE CONDOMINIUM, BLDGS 1-15, A -E & CLUBHOUSE -- 5775 WEST 29TH STREET 0802660619C 08123C1519E LOMA 14-08-0031A 12/17/2013 PORTION OF SECTION 4, T6N, R66W -- 14790 WCR 74 0802660475D 08123C1225E LOMA 14-08-0937A1 05/29/2014 EATON COMMONS SUBDIVISION, BLOCK 8, LOT 17 -- 341 WILLOW AVENUE 0802660486C 08123C1239E LOMA 16-08-0216A 12/30/2015 ARROWHEAD FOURTH FILING, TRACT A -- KIOWA DRIVE 0802660619C 08123C1519E LOMA 16-08-0634A 04/27/2016 SECTION 3, T1 N, R63W -- 33233 HIGHWAY 52 08123C2185E 08123C2185E LOMA 16-08-0663A 06/15/2016 RECORDED EXEMPTION NO. 1303-28-2 RE -4661, LOTA(SECTION 28, T2N, R63W) -- 7648 COUNTY ROAD 65 08123C2180E 08123C2180E LOMA 16-08-1361A 10/18/2016 SECTION 28, T2N, R63W -- 7532 WELD COUNTY ROAD 65 08123C2180E 08123C2180E LOMA 17-08-0015A 11/09/2016 SEC 5, T6N & SEC 32, T7N, R66W, 6TH PM --13462 WELD COUNTY ROAD 74 08123C1225E 08123C1225E LOMA 18-08-0308A 01/10/2018 TWOMBLY RANCH, LOT 5 -- 4402 COUNTY ROAD 49 08123C2155E 08123C2155E LOMA 19-08-0371A 03/08/2019 HUNT & CLAYTON'S TRACT ADJOINING PIERCE, LOT 6 --16107 COUNTY ROAD 90 08123C0919E 08123C0919E LOMA 19-08-0636A 05/13/2019 28828 WCR 60.5 & 29975 WCR 59 08123C1575E 08123C1567F LOMA 19-08-1064A 11/15/2019 EXEMPTION NO. 0707 -20 -4 -RE 1420, LOT A--13487 COUNTY ROAD 78 08123C1225E 08123C1225E 1. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the Town of Eaton due to annexations. 2. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the City of Greeley due to annexations. 3. LOMC was issued for the Unincorporated Areas of Weld County but is now located in the Town of Windsor due to annexations. Page 7 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY 3. LOMCs Superseded Community No: 080266 The modifications effected by the LOMCs listed below have not been reflected on the Preliminary copies of the revised FIRM panels because they are being superseded by new or revised flood hazard information or the information available was not sufficient to make a determination. The reason each is being superseded is noted below. These LOMCs will no longer be in effect when the revised FIRM becomes effective. LOMC Case No. Date Issued Project Identifier Reason Determination Will be Superseded LOMA 01-08-099A 02/09/2001 IDAHO CREEK SCHOOL PORTION OF SECTION 10, T2N, R68W, 6TH P.M. 2 LOMA 01-08-401A 10/24/2001 20114 WELD COUNTY ROAD 5 -- PORTION OF SECTION 21, T4N, R68W, 6TH P.M. 2 LOMA 02-08-319A 07/17/2002 WESTERN DAIRYMEN COOPERATIVE, BLOCK 3, LOT 1 3 LOMA 05-08-0105A 01/05/2005 ALLEN HOME SITES, LOT B -- 389 HIGHWAY 52 2 LOMA 14-08-0714A 05/08/2014 SECTION 2, T4N, R67W -- 23001 WEST COUNTY ROAD 21.75 4 LOMA 15-08-0421A 02/03/2015 WESTERN DAIRYMEN COOP PUD, BLOCK 3, LOT 1 -- 10895 COUNTY ROAD 7.5 3 LOMR 15-08-0943P 05/04/2016 BOULDER SCIENTIFIC PROPERTY 4 LOMA 16-08-1215A 09/14/2016 SECTION 28, T2N, R63W, 6TH PM, SHOWN AS LOT B -- 7532 COUNTY ROAD 65 6 LOMR 16-08-0734P 06/21/2017 WELD COUNTY ROAD 49 EXTENSION (SOUTH PLATTE RIVER) 4 LOMR 19-08-0012P 01/16/2020 IVERSON MINE 4 LOMR 19-08-0862P 10/26/2020 RIVERSIDE PARK 4 LOMR 21-08-0633P 01/27/2022 Godfrey Diversion and Fish Passage 4 Page 8 of 9 SOMA -1 PRELIMINARY SUMMARY OF MAP ACTIONS Community: WELD COUNTY Community No: 080266 1. Insufficient information available to make a determination. 2. Lowest Adjacent Grade and Lowest Finished Floor are below the proposed Base Flood Elevation. 3. Lowest Ground Elevation is below the proposed Base Flood Elevation. 4. Revised hydrologic and hydraulic analyses. 5. Revised topographic information. 6. Superseded by another LOMC. 4. LOMCs To Be Redetermined The LOMCs in Category 2 above will be revalidated through a single revalidation letter that reaffirms the validity of the determination in the previously issued LOMC. For LOMCs issued for multiple lots or structures where the determination for one or more of the lots or structures is no longer valid, the LOMC cannot be revalidated through this administrative process. There- fore, we will review the data previously submitted for the LOMC requests listed below and is- sue a new determination for the affected properties after the effective date of the revised FIRM. LOMC Case No. Date Issued Project Identifier Original Panel Current Panel NO CASES RECORDED Page 9 of 9 Mariah Higgins From: Sent: To: Cc: Subject: Hi all — Diana Aungst Monday, March 28, 2022 3:29 PM Angela Snyder Tom Parko Jr.; Mariah Higgins; Chloe White RE: Weld County, Revised Preliminary Digital Data FYI — it looks like we are not getting a digital version of the Revised Preliminary data (or the corresponding pdfs). The highlights on the changes made are in the email below. Thanks, Diana Aungst Planner Weld County Department of Planning Services 1555 N. 17th Avenue - Greeley, Colorado 80631 D: 970-400-3524 O: 970-400-6100 Fax:970-304-6498 daungst@weldgov.com www.weld9ov.com oO@ Confidentiality Notice: This electronic transmission and any attached documents or other writings are intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. If you have received this communication in error, please immediately notify sender by return e-mail and destroy the communication. Any disclosure, copying, distribution or the taking of any action concerning the contents of this communication or any attachments by anyone other than the named recipient is strictly prohibited. From: OMelveny, Sean <sean.omelveny@aecom.com> Sent: Monday, March 28, 2022 3:20 PM To: Diana Aungst <daungst@weldgov.com> Cc: Gaynes, Christine<christine.gaynes@fema.dhs.gov>; Johnston, James <James.Johnston@aecom.com> Subject: RE: Weld County, Revised Preliminary Digital Data Diana, No We do not have a spatial file showing the revisions between the preliminary FIRMs (2020) and the Revised Preliminary FIRMs (2022). Some of the Highlights for this revised preliminary 1) Resolved Appeal from Town of Windsor on panels 1477, 1481, 1483, 1484. 2) Split Town of Windsor between Larimer and Weld Counties on panel 1477 3) Split City of Longmont between Weld and Laimer Counties on panel 1870 4) Removed "For Information Purposes" mapping for Multi -County communities on panels adjacent to Larimer, Boulder and Adams county that were in the original preliminary 5) Incorporated a Few LOMRs, see SOMA 6) Clarified labeling for SFHAs and Base Flood Elevations on BFE lines and Cross Sections. - For this last I would need to look see specific instances. Fl you need to know more I can follow up later in the week. Thanks Sean O'Melveny FEMA Projects Lead US West Region Water Business Line Technology Solutions Group D +1-801-904-4079 sean.omelvenyriiaecom.com AECOM 756 E Winchester Street, Suite 400 Salt Lake City, Utah 84107, USA T +1-801-904-4000 aecom.com From: Diana Aungst <daungst@weldgov.com> Sent: Monday, March 28, 2O22 2:2O PM To: OMelveny, Sean <sean.omelveny@aecom.com>; Andrew Fisher <Andrew.Fisher@Greeleygov.com> Cc: Gaynes, Christine<christine.gaynes@fema.dhs.gov>; Johnston, James <James.Johnston@aecom.com> Subject: [EXTERNAL] RE: Weld County, Revised Preliminary Digital Data Hi Sean: I think my question may be the same as Andrew's. Does the zip file you just sent contain the revisions that are shown on the hard copies that we received on Friday 3/25/22? Thanks, Diana Aungst Planner Weld County Department of Planning Services 1555 N. 17th Avenue - Greeley, Colorado 80631 D: 970-400-3524 O: 970-400-6100 Fax:970-304-6498 daunqst@weldqov.com www.weldqov.com oar Confidentiality Notice: This electronic transmission and any attached documents or other writings are intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. If you have received this communication in error, please immediately notify sender by return e-mail and destroy the communication. Any disclosure, copying, distribution or the taking of any action concerning the contents of this communication or any attachments by anyone other than the named recipient is strictly prohibited. 2 From: OMelveny, Sean <sean.omelveny@aecom.com> Sent: Monday, March 28, 2022 1:30 PM To: Andrew Fisher <Andrew.Fisher@Greeleygov.com>; Diana Aungst <daungst@weldgov.com> Cc: Gaynes, Christine<christine.gaynes@fema.dhs.gov>; Johnston, James <James.Johnston@aecom.com> Subject: RE: Weld County, Revised Preliminary Digital Data Andrew, This does not include a Changes Since the 2020 Preliminary. I am compiling a list of changes made to the Greeley panels since 2020 and I will send that to you and Chris later this week. Sean O'Melveny FEMA Projects Lead US West Region Water Business Line Technology Solutions Group D +1-801-904-4079 sean.omelvenvfaecom.com AECOM 756 E Winchester Street, Suite 400 Salt Lake City, Utah 84107, USA T +1-801-904-4000 aecom.com From: Andrew Fisher <Andrew.Fisher@Greeleygov.com> Sent: Monday, March 28, 2022 1:22 PM To: OMelveny, Sean <sean.omelvenv@aecom.com>; daungst <daungst@weldgov.com> Cc: Gaynes, Christine<christine.gaynes@fema.dhs.gov>; Johnston, James <James.Johnston@aecom.com> Subject: [EXTERNAL] RE: Weld County, Revised Preliminary Digital Data Thank you. Does this include shape files showing changes since 2020 Preliminary, like that data set included changes since Effective? From: OMelveny, Sean <sean.omelveny@aecom.com> Sent: Monday, March 28, 2022 12:23 PM To: daungst <daungst@weldgov.com>; Andrew Fisher <Andrew.Fisher@Greelevgov.com> Cc: Gaynes, Christine<christine.gavnes@fema.dhs.gov>; Johnston, James <James.Johnston@aecom.com> Subject: [EXTERNAL] Weld County, Revised Preliminary Digital Data All, Chris asked me to send you the digital data from the Revised Preliminary for Weld County, CO that went out last week. We have not yet been able to push this data to the Map Service Center. In the meantime you can access the database (shapefiles), and digital copies of the FIS and FIRMs using the FTP information below. A file has been uploaded to the Floodmaps File eXchange (FFX) site for you by sean.omelvenv@urs.com. To download, select the link below. You have 7 days to download the file before it's deleted from the server. NOTE:.ZZZ files must 3 have their extensions changed to .ZIP, and .z must be changed to .7z before opening. Filenames with the character # will have it removed before opening. Select this link to download the file. If the above link does not work, go to https://floodmaps.fema.gov/ffx/download.php and enter the following filename: 144830_Database.zzz Please let me know if you have any questions. Sean O'Melveny FEMA Projects Lead US West Region Water Business Line Technology Solutions Group D +1-801-904-4079 sean.omelvenvW_aecom.com AECOM 756 E Winchester Street, Suite 400 Salt Lake City, Utah 84107, USA T +1-801-904-4000 aecom.com 4 HUC8 10190008 LONE TREE -OWL *0300E LARIMER COUNTY *0900E HUC8 10190007 CACNE E LA POUDRE *1200E TOWN OF SEVERJNCE 080317 TOWN, OF WINDSOR 080264 0595E 112012016 0885E 1/20/2016 0890E 1/20/2016 *0025E *0325E *0625E 1211E 1I2Ot2016 1213.E 1120d2018 *0050E **0350E i,� 0640. 0620E ' 1/20/2016 , { 1120/2016 t { 0910E 0030E' 7 p'%50E 1/2612016 1/20/2016 1/21i/2016 TOWN OF NUNN • 080188 *0075E LARAMIE COUNTY, WY **0375E 0040E 1120/2016 1250E f /20.2016 1239E 1/2012016 0801 X 75 km_ 1/20.12 Q16 1. r� TOWN OF EATON 0801851 TOWN OF SEVERANCE 080317 *0100E 0090E 1/20/2016 jeres— E `HUC8 10.90003 HUC8 10190003 MIDDLE SOUTH PLATTE -CHERRY CREEK *0125E 0115E 1120/2016 0425E 1(20(2016 **0725E *0150E HU08 **0450E WELD COUNTY 080266 C **1050E[ I *1350E r. rs *0175E I *0225E *0250E 10190015 UPPER LODGEPOL : KIMBALL COUNTY, NE HUC8 10190017 SIDNEY DRAW **1075E *1375E *0200E '0500E '?" Pr **0800 E "0525E **0825E HUC8 10190014 PAV E E Igo Creek; j Y~i l *1100E i **0550E t.y *0275E "Lett elP4t `-'4% *0875E *0575E HUC8 1019001 MIDDLE SOUTH PLATTE - STERLING i **0850EII. I. N NA. \r t _ vreesetet **1150E TOWN OF'RAYMER 080069 *1400E *1425E MIDDLE SOUTH PLATTE -CHERRY CREEK ATTENTION: The corporate limits shown on this FIRM Index are based on the best information available at the time of publication. As such, they may be more current than those shown on the panels issued before TBD. 1 inch = 28,668 feet feet 0 14,000 28L000 561000 1:344,010 Map Projection: Universal Transverse Mercator Zone 13N; North American Datum 1983 THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTPS:V/M C.FEMAIGOV SEE FLOOD INSURANCE STUDY FOR ADDITIONAL INFORMATION * PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS *1450E MORGAN RGAN COUNTY .ry Y Vein *1175E *1475E LOGAN COUNTY HUC810190012 MIDDLE SOUTH PLATTE - STERLING NATIONAL FLOOD INSURANCE PROGRAM noo I-) I N SU RA N CE U V ; Pli P INDEX WELD COUNTY, COLORADO PANELS PRINTED: And Incorporated Areas REVISED PRELIMINARY 3/23/2022 0090, 0115, 0400, 0425, 0595, 0615, 0620, 0640, O885, 0895, 0908, 0909, 0910, 0919, 0920, 0925, 0930, 0938, 0940, 0950, 1185, 1205, 1211, 1213, 1225, 1236, 1237, 1239, 1250, 1275 HMA MAP NUMBER 08123CIND1B MAP REVISED *R nA MCI klrlT fiOlKITtn nncn Iku -ran kir n • LARIMER COUNTY HUC8/0190006 BIG TH0MPSON TOWN OF WINDSOR 080264 '1476F HUC8 10190007 ...:` CACHE LA PO IJ D R E '11480F TOWN OF BERTHOUD (AREA NOT INCLUDED) TOWN OF MEAD 080218 CITY OF LONGMONT 080027 TOWN OF FREDERICK 080244 BOULDER COUNTY HUC8 10190005 ST. VRAIN TO'R'N OF ERIE (AREA NOT INCLUDED) TOWN OF JOHNSTOWN (AREA NOT INCLUDED) **1875E ^��.1660E 1120120% ZIf56F- 149OF 1680F 1830E 2077E j 52100E, 1/20/2016 1/2012016 1 r;� C1kTY �7F f NOR 'II.GLENN . (AREA NC T I1V€I U DE[[ 1835F TOWN OF SEVERANCE 080317 1510F iLtot '4Pkirrpcl '1702E CITY AND COUNTY OF BROOMFIELD 1530E ir2©>i20,1q-I- 1533F 1 ' '"'1362FS HHUCS 101 90008 LONE TREE OWL $666f CITY OF EVA S 1180 182 LaN 1730E-. {- re -TOWN OF GI LCREST 1F2QF 080213 _ I TO OF / , r M11141E I *17 0E ink aker Tow* OF. !PLATTEVHJLL 1935E 19x5 I112012016 e: 080190' TO. F 'REST NE 1.910E 080241'. ti r 1 4. i ,, CITY OF FORT L U PTON 2102F 2110E 080183 *1950E 2155E 1/201201 2136E 1/20/2018 ADAMS COUNTY 080012 1975E 1/20/2016 IUC8 10190009 CROW TOW)) F GARDEN CITY 0' 80246 1620F *1800F 1625E 1/20/2016 10190003 1640E 1120/2016 MIDDLE OUTH PLATTE -CHERRY CREEK ) 080249 2170E' 1/20/2016 2000E 1/20/2016 rj 2180E 1129120104 1 `2225E *1650E 2036E 1/20/2016 *2250E MORGAN COUNTY HUC8 10190010 KI0WA 0WA ATTENTION: The corporate limits shown on this FIRM Index are based on the best information available at the time of publication. As such, they may be more current than those shown on the panels issued before TBD. N 1 inch 23,153 feet 1:277 ,838 11,500 23,000 feet 46,000 Map Projection: Universal Transverse Mercator Zone 13N; North American Datum 1983 THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTPS://MSC.FEMA.GGV SEE FLOOD INSURANCE STUDY FOR ADDITIONAL INFORMATION ' PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS NATIONAL FLOOD INSURANCE PROGRAM OOD INSURANCE RATE o:'AP INDEX WELD COUNTY, COLORADO PANELS PRINTED; REVISED PRELIMINARY 3/23/2022 1477, 1481, 1482, 1483, 1484, 1490, 1495, 1501, 1503, 1504, 1508, 1509, 1510, 1511, 1512, 1513, 1514, 1516, 1517, 1518, 1519, 1528, 1529, 1530, 1533, 1535, 1536, 1537,1541, 1542, 1543, 1544, 1561, 1562, 1563, 1564, 1566, 1567, 1568, 1569, 1575, 1600, 1610, 1620, 1625, 1640, 1660, 1674, 1.676, 1677, 1680,1681, 1682, 1683, 1684, 1686, 1687, 1695, 1701, 1703, 1704, 1706, 1707, 1708, 1709, 1715, 1720, 1726, 1727, 1730, 1731, 1735, 1775, 1810, 1820, 1825, 1850, 1860, 1870, 1880, 1885, 1890, 1895, 1905, 191,5, 1935, 1975, 2000, 2025, 2035, 2056, 2057, 2058, 2066, 2068, 2077, 2079, 2080, 2081, 2083, 2084, 2100, 2102, 2104, 2105, 2115 2135 2155 2157 21.6.0, 2165, 2170, 2180, 2185, 2205 FEMA MAP NUMBER 081230IND2B MAP REVISED ++� DAKICI hlrIT PPIPOTrn 8GC8 f i n-Qin= Inc r`ftl IKITV Ord Rona my FLOOD INSURANCE STUDY VOLUME 'I OF 4 COMMUNITY NAME AULT, TOWN OF DACONO, CITY OF EATON, TOWN OF EVANS, CITY OF FIRESTONE, TOWN OF FORT LUPTON, CITY OF FREDERICK, TOWN OF GARDEN CITY, TOWN OF* GILCREST, TOWN OF NUMBER 080179 080236 080180 080182 080241 080183 080244 080246 080213 GREELEY, CITY OF 080184 GROVER, TOWN OF* 080025 HUDSON, TOWN OF 080249 KEENESBURG, TOWN OF 080251 KERSEY, TOWN OF 080185 LASALLE, TOWN OF 080186 LOCHBUIE, TOWN OF* 080012 LONGMONT, CITY OF 080027 *No Special Flood Hazard Areas Identified REVISED: FLOOD INSURANCE STUDY NUMBER 08123CV001 B WELD COUNTY, COLORADO AND INCORPORATED AREAS COMMUNITY NAME MEAD, TOWN OF MILLIKEN, TOWN OF NUNN, TOWN OF PIERCE, TOWN OF PLATTEVILLE, TOWN OF RAYMER, TOWN OF* SEVERANCE, TOWN OF I WELD COUNTY, UNINCORPORATED AREAS WINDSOR, TOWN OF NUMBER 080218 080187 080188 080189 080190 080069 080317 080266 080264 REVISED PRELIMINARY 3/23/2022 FEMA Version Number 2.6.4.6 TABLE OF CONTENTS Volume 1 SECTION 1.0 — INTRODUCTION 1.1 The National Flood Insurance Program 1.2 Purpose of this Flood Insurance Study Report 1.3 Jurisdictions Included in the Flood Insurance Study Project 1.4 Considerations for using this Flood Insurance Study Report SECTION 2.0 - FLOODPLAIN MANAGEMENT APPLICATIONS 2.1 Floodplain Boundaries 2.2 Floodways 2.3 Base Flood Elevations 2.4 Non -Encroachment Zones 2.5 Coastal Flood Hazard Areas 2.5.1 Water Elevations and the Effects of Waves 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 2.5.3 Dams aand Other Flood Hazard Reduction Measures 2.5.4 Levee Systems SECTION 3.0 — INSURANCE APPLICATIONS 3.1 National Flood Insurance Program Insurance Zones SECTION 4.0 — AREA STUDIED 4.1 Basin Description 4.2 Principal Flood Problems 4.3 Non -Levee Flood Protection Measures 4.4 Levees SECTION 5.0 — ENGINEERING METHODS 5.1 Hydrologic Analyses 5.2 Hydraulic Analyses 5.3 Coastal Analyses 5.3.1 Total Stillwater Elevations 5.3.2 Waves 5.3.3 Coastal Erosion 5.3.4 Wave Hazard Analyses 5.4 Alluvial Fan Analyses SECTION 6.0 — MAPPING METHODS 6.1 Vertical and Horizontal Control 6.2 Base Map 6.3 Floodplain and Floodway Delineation P. age I 1 2 2 13 23 23 33 34 35 35 35 35 35 35 35 35 36 36 37 38 38 38 39 56 57 57 57 57 58 58 58 58 69 69 TABLE OF CONTENTS (CONTINUED) Volume 1 (Continued) Figures Page Figure 1: FIRM Index 14 Figure 2: FIRM Notes to Users 17 Figure 3: Map Legend for FIRM 20 Figure 4: Floodway Schematic 34 Figure 5: Wave Runup Transect Schematic 35 Figure 6: Coastal Transect Schematic 35 Figure 7: Frequency Discharge -Drainage Area Curves 45 Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 57 Figure 9: Transect Location Map 58 Tables Page Table 1: Listing of NFIP Jurisdictions Table 2: Flooding Sources Included in this FIS Report Table 3: Flood Zone Designations by Community Table 4: Basin Characteristics Table 5: Principal Flood Problems Table 6: Historic Flooding Elevations Table 7: Dams and Other Flood Hazard Reduction Measures Table 8: Levees Systems Table 9: Summary of Discharges Table 10: Summary of Non -Coastal Stillwater Elevations Table 11: Stream Gage Information used to Determine Discharges Table 12: Summary of Hydrologic and Hydraulic Analyses Table 13: Roughness Coefficients Table 14: Summary of Coastal Analyses Table 15: Tide Gage Analysis Specifics Table 16: Coastal Transect Parameters Table 17: Summary of Alluvial Fan Analyses Table 18: Results of Alluvial Fan Analyses Table 19: Countywide Vertical Datum Conversion Table 20: Stream -Based Vertical Datum Conversion Table 21: Base Map Sources Table 22: Summary of Topographic Elevation Data used in Mapping Table 23: Floodway Data ii 3 25 36 37 37 38 38 38 40 56 56 58 66 66 66 67 67 67 68 68 69 71 72 TABLE OF CONTENTS (Continued) Volume 2 Page 6.4 Coastal Flood Hazard Mapping 6.5 FIRM Revisions 6.5.1 Letters of Map Amendment 6.5.2 Letters of Map Revision Based on Fill 6.5.3 Letters of Map Revision 6.5.4 Physical Map Revisions 6.5.5 Contracted Restudies 6.5.6 Community Map History 120 120 120 121 121 122 122 123 SECTION 7.0 - CONTRACTED STUDIES AND COMMUNITY COORDINATION 125 7.1 Contracted Studies 125 7.2 Community Meetings 127 SECTION 8.0 - ADDITIONAL INFORMATION 129 SECTION 9.0 — BIBLIOGRAPHY AND REFERENCES 131 Tables Page Table 23: Floodway Data (Continued) 93 Table 24: Flood Hazard and Non -Encroachment Data for Selected Streams 120 Table 25: Summary of Coastal Transect Mapping Considerations 120 Table 26: Incorporated Letters of Map Change 121 Table 27: Community Map History 124 Table 28: Summary of Contracted Studies Included in this FIS Report 125 Table 29: Community Meetings 128 Table 30: Map Repositories 128 Table 31: Additional Information 131 Table 32: Bibliography and References 132 #ii TABLE OF CONTENTS (Continued) Volume 2 (Continued) Exhibits Flood Profiles Ashcroft Draw Big Thompson River Big Thompson River — CR 13 Split Boulder Creek Cache La Poudre River Cache La Poudre River - 35th Avenue to 25th Avenue Pits SFP FLood Profile Cache La Poudre River Pits SFP Cache La Poudre River - Cache La Poudre River - Cache La Poudre River - Cache La Poudre River - Cache La Poudre River - Cache La Poudre River SFP Cache La Poudre River - Cache La Poudre River - Cache La Poudre River - SFP Cache La Poudre River - Cache La Poudre River - Cache La Poudre River SFP Cache La Poudre River Coalbank Creek Consolidated John Law D Volume 3 Exhibits - Downstream of 83rd Avenue Habitat Lake SFP Kodak SFP North Island Grove Park SFP North of 8th Street SFP Over 83rd Avenue SFP - Railroad to 35th Avenue Pits South Island Grove Park SFP State Highway 392 SFP Upstream of 83rd Avenue Pits Upstream of Railroad SFP Varra Pits SFP - Waste Water Treatment Plant Water Valley SFP itch iV Panel 01P -07P 08P-18(b)P 19P 20 P -25P 26-46(c) P 46(d)P Panel 46(e)P 46(f) P 46(g)P 46(h)P 46(i)P-46(j)P 46(k)P-46(m)P 46(n)P 46(o)P 46(p)P-46(q)P 46(r)P 46(s)P-46(u)P 46(v)P 47P 48P -49P 50P-52 P 53P TABLE OF CONTENTS (Continued) Volume 3 (Continued) Flood Profiles Panel Dry Creek No. 2 53(a)P Eaton Draw 54-57P Eaton Draw Split Flow 57(a)P Greeley Canal No. 2 58P John Law Ditch 59P -61P John Law Ditch — CO and Southern RR Flow Path 62P John Law Ditch — FR Energy Flow Path 63P John Law Ditch — FRE SE Flow Path 64P John Law Ditch — FRE SW Flow Path 65P John Law Ditch — GWD Flow Path 66P John Law Ditch — Kodak L Path 67P -68P John Law Ditch — Kodak Road Split Flow 69P John Law Ditch — Railroad Flow Path 70P John Law Ditch — WCR 23 Flow Path 71 P John Law Ditch — WCR 23 Lower Flow Path 72P John Law Ditch — West Tributary 73P John Law Ditch — Whitney Flow Path 74P Little Thompson River 75P-79(j)P Little Thompson River Railroad Split 79(k)P Little Thompson River Schaal Split 79(I)P Little Thompson River SH60 Split 79(m)P Pumpkin Ridge Split Flow Path 80P St. Vrain Creek 81P-86(i)P v TABLE OF CONTENTS (Continued) Volume 4 Exhibits St. Vrain Creek — Existing Lakes 87P St. Vrain Creek — Sandstone Split 87(a)P-87(b)P Sheep Draw 88P -96P South Platte River 97P-118(j)P South Platte River Breach 118(k)P South Platte River Spill 118(I)P Spring Creek 119P Spring Creek Overflow 120P Spring Creek Tributary 121 P -122P The Slough 123P -124P The Slough — Below John Law Ditch Reservoir 125P -126P The Slough Split 1 — Below John Law Ditch Reservoir 127P Tri-Area Drainageway 128P -134P US Highway 34 Bypass Split Flowpath 135P Western Flow Path to Spring Creek Tributary 136P Published Separately Flood Insurance Rate Map (FIRM) vi FLOOD INSURANCE STUDY REPORT WELD COUNTY, COLORADO SECTION 1.0 — INTRODUCTION 1.1 The National Flood Insurance Program The National Flood Insurance Program (NFIP) is a voluntary Federal program that enables property owners in participating communities to purchase insurance protection against losses from flooding. This Insurance Is designed to provide an alternative to disaster assistance to meet the escalating costs of repairing damage to buildings and their contents caused by floods. For decades, the national response to flood disasters was generally limited to constructing flood -control works such as dams, levees, sea-walls, and the like, and providing disaster relief to flood victims. This approach did not reduce losses nor did it discourage unwise development. In some instances, it may have actually encouraged additional development. To compound the problem, the public generally could not buy flood coverage from insurance companies, and building techniques to reduce flood damage were often overlooked. In the face of mounting flood losses and escalating costs of disaster relief to the general taxpayers, the U.S. Congress created the NFIP. The intent was to reduce future flood damage through community floodplain management ordinances, and provide protection for property owners against potential losses through an insurance mechanism that requires a premium to be paid for the protection. The U.S. Congress established the NFIP on August 1, 1968, with the passage of the National Flood Insurance Act of 1966. The NFIP was broadened and modified with the passage of the Flood Disaster Protection Act of 1973 and other legislative measures. It was further modified by the National Flood Insurance Reform Act of 1994 and the Flood Insurance Reform Act of 2004. The NFIP is administered by the Federal Emergency Management Agency (FEMA), which is a component of the Department of Homeland Security (DHS). Participation in the NFIP is based on an agreement between local communities and the Federal Government. If a community adopts and enforces floodplain management regulations to reduce future flood risks to new construction and substantially improved structures in Special Flood Hazard Areas (SFHAs), the Federal Government will make flood insurance available within the community as a financial protection against flood losses. The community's floodplain management regulations must meet or exceed criteria established in accordance with Title 44 Code of Federal Regulations (CFR) Part 60, Criteria for Land Management and Use. SFHAs are delineated on the community's Flood Insurance Rate Maps (FIRMS). Under the NFIP, buildings that were built before the flood hazard was identified on the community's FIRMs are generally referred to as "Pre -FIRM" buildings. When the NFIP was created, the U.S. Congress recognized that insurance for Pre -FIRM buildings would be prohibitively expensive if the premiums were not subsidized by the Federal Government. Congress also recognized that most of these floodprone buildings were 1 built by individuals who did not have sufficient knowledge of the flood hazard to make informed decisions. The NFIP requires that full actuarial rates reflecting the complete flood risk be charged on all buildings constructed or substantially improved on or after the effective date of the initial FIRM for the community or after December 31, 1974, whichever is later. These buildings are generally referred to as "Post -FIRM" buildings. 1.2 Purpose of this Flood Insurance Study Report This Flood Insurance Study (FIS) Report revises and updates information on the existence and severity of flood hazards for the study area. The studies described in this report developed flood hazard data that will be used to establish actuarial flood insurance rates and to assist communities in efforts to implement sound floodplain management. In some states or communities, floodplain management criteria or regulations may exist that are more restrictive than the minimum Federal requirements. Contact your State NFIP Coordinator to ensure that any higher State standards are included in the community's regulations. 1.3 Jurisdictions Included in the Flood Insurance Study Project This FIS Report covers the entire geographic area of Weld County, Colorado. The jurisdictions that are included in this project area, along with the Community Identification Number (CID) for each community and the United States Geological Survey (USGS) 8 -digit Hydrologic Unit Code (HUC-8) sub -basins affecting each, are shown in Table 1. The FIRM panel numbers that affect each community are listed. If the flood hazard data for the community is not included in this FIS Report, the location of that data is identified. Jurisdictions that have no identified SFHAs as of the effective date of this study are indicated in the table. Changed conditions in these communities (such as urbanization or annexation) or the availability of new scientific or technical data about flood hazards could make it necessary to determine SFHAs in these jurisdictions in the future, Please note that the Towns of Berthoud and Johnstown are located in more than one county but are included in their entirety in the Larimer County FIS report. The Towns of Erie and Longmont are located in more than one county but are included in their entirety in the Boulder County FIS report. The Towns of Brighton and Northglenn are located in more than one county but are included in their entirety in the Adams County FIS report. Any references to Adams County, Boulder County, Larimer County, Town of Berthoud, Town of Brighton, Town of Erie, Town of Johnstown, Town of Longmont, and Town of Northglenn, on the Weld County FIRM panels, are for informational purposes only. Please also note that Town of Windsor is located in more than one county but is being shown in its entirety in the Weld County FIS Report. 2 Table 1: Listing of NFIP Jurisdictions Community CID HUC-8 Sub- Sasin(s) Located on FIRM Panel(s) If Not Included, Location of Flood Hazard Data Ault, Town of 080179 10190007, 10190008 08123C1225E, 08123C1250E Berthoud, Town of 080296 10190005, 10190006 08123C1674F, 08123C1676F, 08123C1677F, 08123C1680F, 08123C1686F, 08123C1687F, 08123C1690F2 Larimer County FIS (2021) Brighton, City of 080004 10190003 08123C2115F, 08123C2120E2 Adams County FIS (2018) Dacono, City of 080236 10190003, 10190005 08123C2079E, 08123C2080E, 08123C2083E, 08123C2084E, 08123C2100E Eaton, Town of 080180 10190007, 10190008 08123C1236E, 08123C1237E, 08123C1238E2, 08123C1239E, 08123C1250E Erie, Town of 080181 10190003, 10190005 08123C2056F, 08123C2058F, 08123C2059F2, 08123C2066E, 08123C2068E, 08123C2070E2, 08123C2080E, 08123C2100E Boulder County FIS (2019) Evans, City of 080182 10190003, 10190006 08123C1518E, 08123C1519E, 08123C1540E2 08123C1543F, 08123C1706F, 08123C1707F, 08123C1708F, 08123C1709F, 08123C1726F, 08123C1727F, 08123C1730F, 08123C1731F 3 Table 1: Listing of NFIP Jurisdictions Community CID HUC-8 Sub- Basin(s) Located on FIRM Panels) If Not Included, ' Location of ' Flood Hazard Data Firestone, Town of 080241 10190005, 08123C1870F, 08123C1880F, 08123C1885F, 08123C189 F 08123C1895F, 08123C2077E, 08123C2081E, 08123C2082E2 08123C19115F, 08123C2102F, 08123C2104F, Fort Lupton, City of 080183 10190003 08123C2105E, 08123C2110E2, 08123C2115F, 08123C2120E2, 08123C2130E2 08123C1870F, 08123C1890F, 08123C1895F, 08123C2056F, 08123C2057F, 08123C2058F, 10190003, 08123C2059F2, Frederick, Town of 080244 10190005 08123C2077E, 08123C2079E, 08123C2080E, 08123C2081E, 08123C2082E2, 08123C2083E, 08123C2084E Garden City, Town oft 080246 10190003, 10190007 08123C1540E2, 08123C1543F Gilcrest, Town of 080213 10190003 08123C1720F 4 Table 1: Listing of NFIP Jurisdictions Community CID HUC-8 Sub- Basins) Located on FIRM Panel(s) If Not Included, Location of Flood Hazard Data Greeley, City of 080184 10190003, 10190006, 10190007, 10190008 08123C1495F, 08123C1503F, 08123C1504F, 08123C1508F, 08123C1509F, 08123C1510F, 08123C1511F, 08123C1512E, 08123C1513E, 08123C1514E, 08123C1516E, 08123C1517E, 08123C1518E, 08123C1519E, 08123C1528F, 08123C1529F, 08123C1530E, 08123C1533F, 08123C1535E, 08123C1536F, 08123C1537F, 08123C1540E2, 08123C1541F, 08123C1542F, 08123C1543F, 08123C1544F, 08123C1561F, 08123C1575F Grover, Town of 080025 10190009 08123C0450E2, 08123C0750E2 Hudson, Town of 080249 10190003 08123C2135E, 08123C2145E2, 08123C2155E, 08123C2165E Johnstown, Town of 080250 10190005, 10190006 08123C1674F, 08123C1680F, 0$123C1681 F, 08123C1683F, 08123C1684F, 08123C1695F Lorimer County FRS (2021) Keenesburg, Town of 080251 10190003 08123C2000E, 08123C2155E, 08123C2157E, 08123C2160E, 08123C2180E 5 Table 1: Listing of NFIP Jurisdictions Community CID HUC-8 Sub- Basin(s) Located on FIRM Panel(s) If Not Included, Location of Flood Hazard Data 08123C1544F, 08123C1561 F, Kersey, Town of 080185 10190003, 10190007 08123C1563F, 08123C1564F, 08123C1568F, 08123C1569F 08123C1726F, LaSalle, Town of 080186 10190003 08123C1727F, 08123C1730F 08123C2120E2, Lochbuie, Town oft 080012 10190003 08123C2140E2, 08123C2145E2 08123C1860F, Longmont, City of 080027 10190005 08123C1870F, 08123C1890F 08123C1670F2, 08123C:16h+F, 10190005, 08123C1690F2, Mead, Town of 080218 08123C1860F, 10190006 08123C1880F, 08123C1885F, 08123C1890F 08123C1682F, 08123C1684F, 08123C1695F, 10190003, 08123C1701F, 08123C1703F, Milliken, Town of 080187 10190005, 08123C1704F, 10190006 08123C1706F, 08123C1708F, 08123C1715F, 08123C1905F Adams County Northglenn, City of 080257 10190003 08123C2100E FIS (2021) 08123C0908E, 08123C0909E, Nunn, Town of 080188 10190008 08123C0910E, 08123C0925E 10190007, 08123C0919E, Pierce, Town of 080189 10190008 08123C0938E 6 Table 1: Listing of NFIP Jurisdictions Communi CID HUC-8 Sub- Basin(s Located on FIRM PaneIfs) If Not Included, Location of Flood Hazard Data Platteville, Town of 080190 10190003, 10190005 08123C1715F, 08123C1720F, 08123C1885F, 08123C1905F, 08123C1910E7, 08123C1915F Raymer, Town oft 080069 10190012 08123C 1425E2 Severance, Town of 080317 10190007 08123C1185E, 08123C1200E1, 08123C1205E, 08123C1211 E, 08123C1213E, 08123C1215E2, 08123C 1501 E, 08123C1502E2 Weld County, Unincorporated Areas 080266 10190003, 10190005, 10190006, 10190007, 10190008, 10190009, 10190010, 10190012, 10190014, 10190015, 10190017 08123C0025E2, 08123C0050E2, 08123C0075E2, 08123C0090E, 08123CO1O0E2, 08123C0115E, 08123C0125E2, 08123C0150E2, 08123C0175E2, 08123CO200E2, 08123C0225E2, 08123C0250E2, 08123CO275E2, 08123C0300E2, 08123C0325E2, 08123C0350E2, 08123C0375E2, 08123C0400E, 08123C0425E, 08123C0450E2, 08123C0475E2, 08123C0500E2, 08123C0525E2, 08123CO550E2, 08123C0575E2, 7 Table 1: Listing of NFIP Jurisdictions If Not Community CID HU C-8 Sub- Basints Located on FIRM Panel(s) Included, Location of Flood Hazard Data 08123C0595E, 08123C0600E2, 08123C0615E, 08123C0620E, 08123C0625E2, 08123C0640E, 08123C0650E2, 08123C0675E2, 08123C0700E2, 08123C0725E2, 08123C0750E2, 08123C0775E2, 08123C0800E2, 10190003, 08123C0825E2, 10190005, 08123C0850E2, 10190006, 10190007, 08123C0875E2, Weld County, 10190008, 08123C0885E, Unincorporated Areas 080266 10190009, 08123C0895E, (cont.) 10190010, 10190012, 08123C0900E2, 10190014, 08123C0908E, 10190015, 08123C0909E, 10190017 08123C0910E, 08123C0919E, 08123C0920E, 08123C0925E, 08123C0930E, 08123C0938E, 08123C0940E, 08123C0950E, 08123C0975E2, 08123C1000E2, 08123C1025E2, 08123C1O50E2, 08123C1075E2, 08123C1100E2, 8 Table 1: Listing of NFIP Jurisdictions Community CID HUC-8 Sub- Basins) Located on FIRM Panel(s) If Not Included, Location of Flood Hazard Data 08123C1125E2, 08123C1150E2, 08123C1175E2, 08123C1185E, 08123C1200E2, 08123C1205E, 08123C1211E, 08123C1213E, 08123C1215E2, 08123C1225E, 08123C1236E, 08123C1237E, 08123C1238E2, 08123C1239E, 10190003, 08123C1250E, 10190006, 10190006, 08123C1275E, 10190007, 08123C1300E2, Weld County, Unincorporated Areas (cont.) 080266 10190008, 10190009, 10190010, 08123C1325E2, 08123C1350E2, 10190012, 08123C1375E2, 10190014, 10190015, 08123C1400E2, 10190017 08123C1425E2, 08123C1450E2, 08123C1475E2, 08123C1477F, 08123C1481F, 08123C1482E, 08123C1483F, 08123C1484F, 08123C1490F, 08123C1495F, 0812301501 E, 08123C1502E2, 08123C1503F, 08123C1504F, 08123C1508F, 9 Table 1: Listing of NFIP Jurisdictions Community CID HUC-B Sub- Basin(s) Located on FIRM Panel(s) If Not ' Included, Location of Flood Hazard Data 08123C1509F, 08123C1510F, 08123C1511F, 08123C1512E, 08123C1513E, 08123C1514E, 08123C1516E, 08123C1517E, 08123C1518E, 08123C1519E, 08123C1528F, 08123C1529F, 08123C1530E, 10190003, 10190005, 08123C1533F, 10190006, 08123C1535E, 10190007, 08123C1536F, Weld County, 10190008, 08123C1537F, Unincorporated Areas (cont.) 080266 10190009, 10190010, 08123C1540Ez, 10190012, 08123C1541F, 10190014, 08123C1542F, 10190015, 08123C1543F, 10190017 08123C1544F, 08123C1561F, 08123C1562F, 08123C1563F, 08123C1564F, 08123C1566F, 08123C1567F, 08123C1568F, 08123C1569F, 08123C 1575F, 08123C1600F, 08123C1610F, 08123C1620F, 10 Table 1: Listing of NFU:. Jurisdictions Community Weld County, Unincorporated Areas (cont.) CID 080266 HUC-8 Sub- Basin(s) 10190003, 10190005, 10190006, 10190007, 10190008, 10190009, 10190010, 10190012, 10190014, 10190015, 10190017 Located an FIRM Panels} 08123C1E25E, 08123C1640E, 08123C1650E2, 08123C1660E, 08123C1670F2, 08123C1674F, 08123C1676F, 08123C1677F, 08123C1680F, 08123C1681F, 08123C1682F, 08123C1683F, 08123C1684F, 08123C1686F, 08123C1687F, 08123C1690F2, 08123C1695F, 08123C1701F, 08123C1702E2, 08123C1703F, 08123C1704F, 08123C1706F, 08123C1707F, 08123O1708F, 08123C1709F, 08123C1715F, 08123C1720F, 08123C1726F, 08123C1727F, 08123C1730F, 08123C1731F, 08123C1735E, 08123C1750E2, 08123C1775E, 08123C1800F2, 08123C1810F, 08123C1820F, If Not Included, Location of Flood Hazard Data 11 Table 1: Listing of NFIP Jurisdictions Community CID HUC-8 Sub- Basin(s) Located on FIRM Panel(s) If Not Included, Location of Flood Hazard Data 08123C18251, 08123C1850F, 08123C1860F, 08123C1870F, 08123O1880F, 08123C1885F, 08123C1890F, 08123O18951, 08123C1905F, 08123C1910E2, 08123C1915F, 08123C1920E2, 08123C1935E, 08123O1950E2, 08123O1975E, 10190003, 10190005, 08123C2000E, 10190006, 08123O2025E, 10190007, 08123O2035E, Weld County, Unincorporated Areas (cont.) 080266 10190008, 10190009, 10190010, 08123O2050E2, 08123O2056F, 10190012, 08123C2057F, 10190014, 08123O2058F, 10190015, 10190017 08123O2059F2, 08123O2066E, 08123O2068E, 08123O2070E2, 08123O2077E, 08123O2079E, 08123O2080E, 08123C2081E, 08123O2082E2, 08123O2083E, 08123O2084E, 08123O2100E, 08123C2102F, 08123C2104F, 08123O2105E, 08123O2110E2, 12 Table 1: Listing of NFIP Jurisdictions Community CID HUC-8 Sub- Basin(s) Located on FIRM Panel(s) If Not Included, Location of Flood Hazard Data Weld County, Unincorporated Areas (cont,) 080266 10190003, 10190005, 10190006, 10190007, 10190008, 10190009, 10190010, 10190012, 10190014, 10190015, 10190017 08123C2115F, 08123C2120E2, 08123C2130E2, 08123C2135E, 08123C2140E2, 08123C2145E2, 08123C2155E, 08123C2157E, 08123C2160E, 08123C2165E, 08123C2170E, 08123C2180E, 08123C2185E, 08123C2200E2, 08123C2205E, 08123C2225E2, 08123C2250E2 Windsor, Town of 080264 10190006 10190007 08123C1200E2, 08123C1476F2, 08123C1477F, 08123C1480F2, 0812301481 F, 08123C1482E, 08123C1483F, 08123C1484F, 08123C1490F, 08123C1495F, 08123C1501E, 08123C1503F, 08123C1504F, 08123C1511F No Special Flood Hazard Areas Identified 2 Panel Not Printed 1.4 Considerations for using this Flood Insurance Study Report The NFIP encourages State and local governments to implement sound floodplain management programs. To assist in this endeavor, each FIS Report provides floodplain data, which may include a combination of the following: 10-, 4-, 2-, 1-, and 0.2 -percent annual chance flood elevations (the 1 -percent -annual -chance flood elevation is also referred to as the Base Flood Elevation (BFE)); delineations of the 1 -percent -annual - 13 chance and 0.2 -percent -annual -chance floodplains; and 1 -percent -annual -chance floodway. This information is presented on the FIRM and/or in many components of the FIS Report, including Flood Profiles, Floodway Data tables, Summary of Non -Coastal Stillwater Elevations tables, and Coastal Transect Parameters tables (not all components may be provided for a specific FIS). This section presents important considerations for using the information contained in this FIS Report and the FIRM, including changes in format and content. Figures 1, 2, and 3 present information that applies to using the FIRM with the FIS Report. • Part or all of this FIS Report may be revised and republished at any time. In addition, part of this FIS Report may be revised by a Letter of Map Revision (LOMR), which does not involve republication or redistribution of the FIS Report. Refer to Section 6.5 of this FIS Report for information about the process to revise the FIS Report and/or FIRM. It is, therefore, the responsibility of the user to consult with community officials by contacting the community repository to obtain the most current FIS Report components. Communities participating in the NFIP have established repositories of flood hazard data for floodplain management and flood insurance purposes. Community map repository addresses are provided in Table 30, "Map Repositories," within this FIS Report. • New FIS Reports are frequently developed for multiple communities, such as entire counties. A countywide FIS Report incorporates previous FIS Reports for individual communities and the unincorporated area of the county (if not jurisdictional) into a single document and supersedes those documents for the purposes of the NFIP. The initial Countywide FIS Report for Weld County became effective on January 20, 2016. Refer to Table 27 for information about subsequent revisions to the FIRMs. • FEMA has developed a Guide to Flood Maps (FEMA 258) and online tutorials to assist users in accessing the information contained on the FIRM. These include how to read panels and step-by-step instructions to obtain specific information. To obtain this guide and other assistance in using the FIRM, visit the FEMA Web site at www.fema gpv/online-tutorials. The FIRM Index in Figure 1 shows the overall FIRM panel layout within Weld County, and also displays the panel number and effective date for each FIRM panel in the county. Other information shown on the FIRM Index includes community boundaries, flooding sources, watershed boundaries, and USGS HUC-6 codes. 14 Figure 1: FIRM Index HUC8 10190008 LONE TREE -OWL LARIIVMER COUNTY *0300E *060OE *0025E *0050E *0075E LARAMIE COUNTY, WY *0100E 0090E 1/2012016 *0125E 0115E 1/20/2016 55 *0325E PIMIL r L t*0350E **0525E • *0900E HUC8 1 01 90007 CACHE LAPDL GRE 0615E 1120/2016 **0650E 1? 0640E 0620E 1/2012016 1/20/2016 Zn fl _ 1 **0375E no • 77' 0400E 1/2012016 *"`0675E r rre sic r r 0666E . `i' 1/2012016 0896E 1/20120/6 091.0:F 1120/2016 �E a$OBEJ 15 0968E 112P14318 0930E 0950E 1/20/2016 112012016 TOWN OF N U N 080188 0925E 1.12012016 *1200E TOWN OF SEVERANCE 080317 TOWN OF WIND':OR 080264 J/ 1186E 1120120,16 1206E • 1/20/2016 - '1215 t₹91iE; 9 P241420115 { Irk: t+2n*I16 I 09.20E 0940E 112012016 1/20/2016 8939E B ecru '112 012 0 1 6 11 U12u1d? 1 HU0U 11 0190009 CROW **0700E F **0975E TOWN OF PIERCE 080189 *1000E TOWN (SAULT 1250E 1/20/2016 1237E4 wj6E pon...U110 1!101201.9 1225E I clb 1120/2016 17;FE 0801 1275E 1120120'15 • TOWN OF EATON 080180 79 **1300E d 04. 0425E 1/20/20196 r — iv r **0725E f i *0200E *0150E *0175E HUC8 10190015 UPPER LODGEPOLE i *0225E *0250E KIMBALL COUNTY, NE HUC8 10190017 SIDNEY DRAW **0450E **0475E **0500E TOWN OF GIZOVER 080025 *0275E #*O525 E **0750E WELD C i]4TN1 , 080266 *Q775E krrlfrrarft rt. ire, **0800E HUGS 10190014 PAWN EL **0825E fijo ('rarg,h **1025E **1050, **1075E *1100E **1125E iftirrS St)X411,1 *1132.5E *1350E *1375E *1400E HUC8 10190003 **0550E 10575E H U C8 10190012 MIDDLE SOUTH PLATTE- TERLINO licto I4 'ode **0850E *0875E LOGAN COUNTY *1175E *t1150E TOWN O F-IAYMER 080069\ *1425E (SD *1450E *1475E HUC8 10190012 MIDDLE SOUTH PLATTE_ STERLING TOWN OF SEVERANCE HUC8 10190003 MIDDLE SOUTH PLATTE -CHERRY CREEK 080317 MIDDLE SOUTH PLATTE -CHERRY CREEK ATTENTION: The corporate limits shown an this FIRM Index are based on the best information available at the time of publication. As such, they may be more current than those shown on the panels issued before TBD. A 1 inch = 28,668 feet 1:344,010 feet 0 14,000 28,000 56,000 Map Projection: Universal Transverse Mercator Zone 13N; North American Datum 1983 THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTPS:V/MSC.FEMA.COV SEE FLOOD INSURANCE STUDY FOR ADDITIONAL INFORMATJON * PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS **PANEL NOT PRINTED -AREA IN ZONE D COUNTY LOCATOR NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP INDEX WELD COUNTY, COLORADO PANELS PRINTED: MORGAN COUNTY And Incorporated Areas REVISED PRELIMINARY 3/23/2022 0090, 0115, 0400, 0425, 0595, 0615, 0620, 0640, 0885, 0895, 0908, 0909, 0910, 0919, 0920, 0925, 0930, 0938, 0940, 0950, 1185, 1205, 1211, 1213, 1225, 1236, 1237, 1239, 1250, 1275 L� MIN is s st i i MAP NUMBER 0812301ND1B MAP REVISED 15 1 1 LARIMER COUNTY HUC8 10190006 BIG THOIVIPSON TOWN OF WINDSOR 080264 HUGS 10190007 CACHE LA POUDRE TOWN OF BERTHOUD (AREA NOT INCLUDED) TOWN OF MEAD 080218 CITY OF LONGMONT 080027 TOWN OF FREDERICK 080244 BOULDER COUNTY HUCS 10190005 St VRAIN TOWN OF ERIE (AREA NOT INCLUDED) TOWN OF JOHNSTOWN TOWN (AREA NOT INCLUDED) **j$75E **1875E **2075E 9 670F 2QS6iF 21!57 F 2b5EF '2Q59F A 1 inch =23,153 feet 1:277,838 feet N 0 11,500 23,000 46,000 Map Projection: Universal Transverse Mercator Zone 13N; North American Datum 1983 THE INFORMATION DENOTED ON THIS MAP AND SUPPORTING DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT HTTP:// M S C. FE M A.G OV SEE FLOOD INSURANCE STUDY FOR ADDITIONAL INFORMATION * PANEL NOT PRINTED - NO SPECIAL FLOOD HAZARD AREAS " PANEL NOT PRINTED - AREA OUTSIDE OF COUNTY BOUNDARY 1490F 1680F 1695F _sy 1880F` *NIUE 2105E 1/20i2015 -20S4E 1,21;0 901.6 CITY OF Iric_ICONO 080236 TOWN OF SEVERANCE 2104F 2100E 1/20/2016 cc r -v o NOLt[II��I.I NN (ARREA N91' INJ 'L'LIDEI'.) 2115F CITY AND COUNTY OF BROOMFIELD 080317 1510F 1748E 11700E 1720F 15313E 1120120416 1528E 1535E 112012 ' 16 1730E- 1735E 112012016 TOWN OF OILOREST 080213 TOWN OF f4 MILLIKEN * 17'50E .080187 TOWN OF PLATTEVIL'LE 080190 419217E 4935E 1/2O/2O16 *1950E CITY OF FORT LUPTON 080183 2135E 41130E' 1/20/2016 CITY 0I- ' I Rlt�l ursvg 1AREA NOT INCLUDE -'1 4.21.20E 24410E HUC8 1019O008 LONE TREE OWL 1575F CITY CI F GREELEY 080184 1552F 1$04F S 1600F HUCS 10190009 CROW TowNeo '. GARDEN CITY 680246 1620F CITY OF F. 4'A NS TOWN I -F KERSEY 080182 080185 1775E 1/20/2016 1975E 1/20/2016 *1800F 1625E 1/20/2016 10190003 1640E 1/20/2016 MIDDLE SOUTH PLATTE -CHERRY CREEK 080249 2165E 2170E °2145E 11.2012016 1/20/2016 TOWN OF rLOCIMUIE ADAMS COUNTY 080012 2205E 1/20/2016 *2225E *1650.E 2035E 172O12O16 *2250E 2000E 1/20/2016 TOWN OF KEENESBURO 080251 2185E 1/20/2016 *2200E MORGAN COUNTY HUC8 10190010 KIOWAi V VLl+A ATTENTION: The corporate limits shown on this FIRM Index are based on the best information available at the time of publication. As such, they may be more current than those shown on the panels issued before TBD, NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP INDEX WELD COUNTY, COLORADO PANELS PRINTED: REVISED PRELIMINARY 3/23/2022 1477,1481, 1482, 1483, 1484, 1490, 1495, 1501, 1503, 1504, 1508, 1509, 1510, 1511, 1512, 1513, 1514, 1516, 1517, 1518, 1519, 1528, 1529, 1530, 1533, 1535, 1536, 1537, 1541, 1542, 1543, 1544, 1561, 1562, 1563, 1564, 1566, 1567, 1568, 1569, 1575, 1600, 1610, 1620, 1625, 1640, 1660, 1674, 1676, 1677, 1680, 1681, 1682, 1683, 1684, 1680, 1687, 1695, 1701, 1703, 1704, 1706, 1707, 1708, 1709, 1715, 1720, 1726, 1727, 173O, 1731, 1735, 1775, 1810, 1820,1825, 1850, 1860, 1870, 1880, 1885, 1890, 1895, 1905, 1915, 1935, 1975, 2000, 2025, 2035, 2056, 2057, 2058, 2066, 2068, 2077, 2O79, 2080, 2O81, 2083, 2084, 2100, 21O2, 2104, 2105, 2115, 2135, 2155 2157, 2160, 2165, 217O. 2180. 2185, 22O5 r. w ..i _.i MAP NUMBER 08123OIND2B MAP REVISED 16 Each FIRM panel may contain specific notes to the user that provide additional information regarding the flood hazard data shown on that map. However, the FIRM panel does not contain enough space to show all the notes that may be relevant in helping to better understand the information on the panel. Figure 2 contains the full list of these notes. Figure 2: FIRM Notes to Users NOTES TO USERS For information and questions about this map, available products associated with this FIRM including historic versions of this FIRM, how to order products, or the National Flood Insurance Program in general, please call the FEMA Map Information eXchange at 1-877- FEMA-MAP (1-877-336-2627) or visit the FEMA Flood Map Service Center website at mc.fema_goy. Available products may include previously issued Letters of Map Change, a Flood Insurance Study Report, and/or digital versions of this map. Many of these products can be ordered or obtained directly from the website. Users may determine the current map date for each FIRM panel by visiting the FEMA Flood Map Service Center website or by calling the FEMA Map Information eXchange. Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well as the current FIRM Index. These may be ordered directly from the Flood Map Service Center at the number listed above. For community and countywide map dates, refer to Table 27 in this FIS Report. To determine if flood insurance is available in the community, contact your insurance agent or call the National Flood Insurance Program at 1-800-638-6620. PRELIMINARY FIS REPORT: FEMA maintains information about map features, such as street locations and names, in or near designated flood hazard areas. Requests to revise information in or near designated flood hazard areas may be provided to FEMA during the community review period, at the final Consultation Coordination Officer's meeting, or during the statutory 90 -day appeal period. Approved requests for changes will be shown on the final printed FIRM. The map is for use in administering the NFIP. It may not identify all areas subject to flooding, particularly from local drainage sources of small size. Consult the community map repository to find updated or additional flood hazard information. BASE FLOOD ELEVATIONS: For more detailed information in areas where Base Flood Elevations (BFEs) and/or floodways have been determined, consult the Flood Profiles and Floodway Data and/or Summary of Non -Coastal Stillwater Elevations tables within this FIS Report. Use the flood elevation data within the FIS Report in conjunction with the FIRM for construction and/or floodplain management. FLOODWAY INFORMATION: Boundaries of the floodways were computed at cross sections and interpolated between cross sections. The floodways were based on hydraulic considerations with regard to requirements of the National Flood Insurance Program. Floodway widths and other pertinent floodway data are provided in the FIS Report for this jurisdiction. 17 Figure 2. FIRM Notes to Users FLOOD CONTROL STRUCTURE INFORMATION: Certain areas not in Special Flood Hazard Areas may be protected by flood control structures. Refer to Section 4.3 "Non -Levee Flood Protection Measures" of this FIS Report for information on flood control structures for this jurisdiction. PROJECTION INFORMATION: The projection used in the preparation of the map was Universal Transverse Mercator (UTM) Zone 13. The horizontal datum was the North American Datum of 1983 NAD83, GRS1980 spheroid. Differences in datum, spheroid, projection or State Plane zones used in the production of FIRMs for adjacent jurisdictions may result in slight positional differences in map features across jurisdiction boundaries. These differences do not affect the accuracy of the FIRM. ELEVATION DATUM: Flood elevations on the FIRM are referenced to the North American Vertical Datum of 1988. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between the National Geodetic Vertical Datum of 1929 and the North American Vertical Datum of 1988, visit the National Geodetic Survey website at www.ngs.noaa.gov_ Local vertical monuments may have been used to create the map. To obtain current monument information, please contact the appropriate local community listed in Table 30 of this FIS Report. BASE MAP INFORMATION: Base map information shown on this FIRM was derived from the National Flood Hazard Layer (NFHL), dated 2016 and digital data provided by Weld County GIS Department, dated 2018 and Ortholmagery derived from the National Agriculture Imagery Program (NAIP), dated 2017. For information about base maps, refer to Section 6.2 "Base Map" in this FIS Report. Corporate limits shown on the map are based on the best data available at the time of publication. Because changes due to annexations or de -annexations may have occurred after the map was published, map users should contact appropriate community officials to verify current corporate limit locations. NOTES FOR FIRM INDEX REVISIONS TO INDEX: As new studies are performed and FIRM panels are updated within Weld County, CO, corresponding revisions to the FIRM Index will be incorporated within the FIS Report to reflect the effective dates of those panels. Please refer to Table 27 of this FIS Report to determine the most recent FIRM revision date for each community. The most recent FIRM panel effective date will correspond to the most recent index date. ATTENTION: The corporate limits shown on this FIRM Index are based on the best information available at the time of publication. As such, they may be more current than those shown on FIRM panels issued before (TBD] 18 SPECIAL NOTES FOR SPECIFIC FIRM PANELS This Notes to Users section was created specifically for Weld County, CO FLOOD RISK REPORT: A Flood Risk Report (FRR) may be available for many of the flooding sources and communities referenced in this FIS Report. The FRR is provided to increase public awareness of flood risk by helping communities identify the areas within their jurisdictions that have the greatest risks. Although non -regulatory, the information provided within the FRR can assist communities in assessing and evaluating mitigation opportunities to reduce these risks. It can also be used by communities developing or updating flood risk mitigation plans. These plans allow communities to identify and evaluate opportunities to reduce potential loss of life and property. However, the FRR is not intended to be the final authoritative source of all flood risk data for a project area; rather, it should be used with other data sources to paint a comprehensive picture of flood risk. 19 Each FIRM panel contains an abbreviated legend for the features shown on the maps. However, the FIRM panel does not contain enough space to show the legend for all map features. Figure 3 shows the full legend of all map features. Note that not ail of these features may appear on the FIRM panels in Weld County. Figure 3: Map Legend for FIRM SPECIAL FLOOD HAZARD AREAS: The 1% annual chance flood, also known as the base flood or 100 -year flood, has a 1% chance of happening or being exceeded each year. Special Flood Hazard Areas are subject to flooding by the 1% annual chance flood. The Base Flood Elevation is the water surface elevation of the 1% annual chance flood. The floodway is the channel of a stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood can be carried without substantial increases in flood heights. See note for specific types. If the floodway is too narrow to be shown, a note is shown. Special Flood Hazard Areas subject to inundation by the 1% annual chance flood (Zones A, AE, AH, AO, AR, A99, V and VE) Zone A The flood insurance rate zone that corresponds to the 1% annual chance floodplains. No base (1% annual chance) flood elevations (BFEs) or depths are shown within this zone. Zone AE The flood insurance rate zone that corresponds to the 1% annual chance floodplains. Base flood elevations derived from the hydraulic analyses are shown within this zone. Zone AH The flood insurance rate zone that corresponds to the areas of 1% annual chance shallow flooding (usually areas of ponding) where average depths are between 1 and 3 feet. Whole -foot BFEs derived from the hydraulic analyses are shown at selected intervals within this zone. Zone AO The flood insurance rate zone that corresponds to the areas of 1% annual chance shallow flooding (usually sheet flow on sloping terrain) where average depths are between 1 and 3 feet. Average whole -foot depths derived from the hydraulic analyses are shown within this zone. Zone AR The flood insurance rate zone that corresponds to areas that were formerly protected from the 1% annual chance flood by a flood control system that was subsequently decertified. Zone AR indicates that the former flood control system is being restored to provide protection from the 1% annual chance or greater flood. Zone A99 The flood insurance rate zone that corresponds to areas of the 1% annual chance floodplain that will be protected by a Federal flood protection system where construction has reached specified statutory milestones. No base flood elevations or flood depths are shown within this zone. Zone V The flood insurance rate zone that corresponds to the 1% annual chance coastal floodplains that have additional hazards associated with storm waves. Base flood elevations are not shown within this zone. Zone VE Zone VE is the flood insurance rate zone that corresponds to the 1% annual chance coastal floodplains that have additional hazards associated with storm waves. Base flood elevations derived from the coastal analyses are shown within this zone as static whole -foot elevations that apply throughout the zone. Regulatory Floodway determined in Zone AE. 20 Figure 3: Map Legend for FIRM OTHER AREAS OF FLOOD HAZARD Shaded Zone X: Areas of 0.2% annual chance flood hazards and areas of 1% annual chance flood hazards with average depths of less than 1 foot or with drainage areas less than 1 square mile. Future Conditions 1% Annual Chance Flood Hazard — Zone X: The flood insurance rate zone that corresponds to the 1% annual chance floodplains that are determined based on future -conditions hydrology. No base flood elevations or flood depths are shown within this zone. Area with Reduced Flood Risk due to Levee: Areas where an accredited levee, dike, or other flood control structure has reduced the flood risk from the 1% annual chance flood. Area with Flood Risk due to Levee: Areas where a non -accredited levee, dike, or other flood control structure is shown as providing protection to less than the 1% annual chance flood. OTHER AREAS Zone D (Areas of Undetermined Flood Hazard): The flood insurance rate zone that corresponds to unstudied areas where flood hazards are undetermined, but possible. NO SCREEN Unshaded Zone X: Areas of minimal flood hazard. FLOOD HAZARD AND OTHER BOUNDARY LINES (ortho) (vector) * A. GENERAL STRUCTURES Aqueduct Channel Culvert Storm Sewer Flood Zone Boundary (white line on ortho-photography-based mapping; gray line on vector -based mapping) Limit of Study Jurisdiction Boundary Limit of Moderate Wave Action (LiMWA): Indicates the inland limit of the area affected by waves greater than 1.5 feet Channel, Culvert, Aqueduct, or Storm Sewer Dam Jetty Dam, Jetty, Weir Weir IttllIIIIlllnlilllttf[t Levee, Dike, or Floodwall Bridge Bridge 21 Figure 3: Map Legend for FIRM REFERENCE MARKERS 22.0 River mile Markers CROSS SECTION & TRANSECT INFORMATION 20.2 Lettered Cross Section with Regulatory Water Surface Elevation (BFE) 21.1 17.5 Numbered Cross Section with Regulatory Water Surface Elevation (BEE) Unlettered Cross Section with Regulatory Water Surface Elevation (BFE) Coastal Transect Profile Baseline: Indicates the modeled flow path of a stream and is shown on FIRM panels for all valid studies with profiles or otherwise established base flood elevation. Coastal Transect Baseline: Used in the coastal flood hazard model to represent the 0.0 -foot elevation contour and the starting point for the transect and the measuring point for the coastal mapping. 513 Base Flood Elevation Line ZONE AE (EL 16) ZONE AO (DEPTH 2) ZONE AO (DEPTH 2) (VEL 15 FPS) BASE MAP FEATURES Missouri Creek 234 MAPLE LANE RAILROAD Static Rasp Flnnd Flevation valiia (shown limier lone label) Zone designation with Depth Zone designation with Depth and Velocity River, Stream or Other Hydrographic Feature Interstate Highway U.S. Highway State Highway County Highway Street, Road, Avenue Name, or Private Drive if shown on Flood Profile Railroad 22 Figure 3: Map Legend for FIRM t Land Grant 7 R. 43 W. T. 22 N. 4276000mE 365000 FT 80° 16' 52.5" Horizontal Reference Grid Line Horizontal Reference Grid Ticks Secondary Grid Crosshairs Name of Land Grant Section Number Range, Township Number Horizontal Reference Grid Coordinates (UTM) Horizontal Reference Grid Coordinates (State Plane) Corner Coordinates (Latitude, Longitude) SECTION 2.0 — FLOODPLAIN MANAGEMENT APPLICATIONS 2.1 Floodplain Boundaries To provide a national standard without regional discrimination, the 1 -percent -annual - chance (100 -year) flood has been adopted by FEMA as the base flood for floodplain management purposes. The 0.2 -percent -annual -chance (500 -year) flood is employed to indicate additional areas of flood hazard in the community. Each flooding source included in the project scope has been studied and mapped using professional engineering and mapping methodologies that were agreed upon by FEMA and Weld County as appropriate to the risk level. Flood risk is evaluated based on factors such as known flood hazards and projected impact on the built environment. Engineering analyses were performed for each studied flooding source to calculate its 1 - percent -annual -chance flood elevations; elevations corresponding to other floods (e.g. 10-, 4-, 2-, 0.2 -percent annual chance, etc.) may have also been computed for certain flooding sources. Engineering models and methods are described in detail in Section 5.0 of this FIS Report. The modeled elevations at cross sections were used to delineate the floodplain boundaries on the FIRM; between cross sections, the boundaries were interpolated using elevation data from various sources. More information on specific mapping methods is provided in Section 6.0 of this FIS Report. Depending on the accuracy of available topographic data (Table 22), study methodologies employed (Section 5.0), and flood risk, certain flooding sources may be mapped to show both the 1 -percent and 0.2 -percent -annual -chance floodplain boundaries, regulatory water surface elevations (BFEs), and/or a regulatory floodway. Similarly, other flooding sources may be mapped to show only the 1 -percent -annual - chance floodplain boundary on the FIRM, without published water surface elevations. In cases where the 1 -percent and 0.2 -percent -annual -chance floodplain boundaries are close together, only the 1 -percent -annual -chance floodplain boundary is shown on the FIRM. Figure, "Map Legend for FIRM", describes the flood zones that are used on the FIRMs to account for the varying levels of flood risk that exist along flooding sources 23 within the project area. Table 2 and Table 3 indicate the flood zone designations for each flooding source and each community within Weld County, respectively. Table 2, "Flooding Sources Included in this FIS Report," lists each flooding source, including its study limits, affected communities, mapped zone on the FIRM, and the completion date of its engineering analysis from which the flood elevations on the FIRM and in the FIS Report were derived. Descriptions and dates for the latest hydrologic and hydraulic analyses of the flooding sources are shown in Table 12. Floodplain boundaries for these flooding sources are shown on the FIRM (published separately) using the symbology described in Figure 3. On the map, the 1 -percent -annual -chance floodplain corresponds to the SFHAs. The 0.2 -percent -annual -chance floodplain shows areas that, although out of the regulatory floodplain, are still subject to flood hazards. Small areas within the floodplain boundaries may lie above the flood elevations but cannot be shown due to limitations of the map scale and/or lack of detailed topographic data. The procedures to remove these areas from the SFHA are described in Section 6.5 of this FIS Report. 24 0 N Ll. in 0 0 0 U) O O N d ea F - N- C) N- 0 N 0 a N co a N co 0 N CO N CO a N W LIJ W W LUJ W LU Lu >- >- >- >- >- } >- >- ° co al '^ {EO •E C O 40 ' a V (-4 c% co d) O N co LC) M O co O O co co i . 0 = �o U) _ �!) m C.) O 0 rn r OE t— CO CO O O 0 0 rn rn r r O r r L() O O rn v- 0 r CO N- CO ti 0 0 0 O O4a o as a) rn rn r r r r O O O O ti 0 0 rn r O N- a O rn r O &. _E -„ J LO EL) N a' Q) E N S� 0 al E E X Q ) a Q Q 7 o 0 teM0 -O LL cu O C Zi -o C = m as 0 Q:_ in _ N (n 7) Co .. Q c (4 / U0 0 E L Q) a) O c 92 ` a' r..) v a) 43 a) z d� co O ? O _I co c-.) —.1 N 0 E . C > O a) - C a) 0_ ? O ❑J 7--- 2 r ` Q) 03 N c cNn O O 0- 0 E J E 0 2? rei c o ❑ s 0 a) 0 0 �, r, N _ p o - o a) Cn m - • • 7� 3± a) 16 a)c c c a) ix O Q. 7 = E 0 CO d O.C 0 a 0 1- cn 3 Y a)0 c a� a)o C 'C O 0> - O co 2 ..=,•3 L 3 d a)o a) r)- n o c c a)cc a)J c c a) C C C) N O@ o CO .? 0 a 00E? N 3 0 a)a c o dJ c Q) CO O N .? 00 Et 2 3 0 a)0- c a)J = a) COW O co .? 00 ix o U co 2 a) c U o a u d- c'cc cu 0 c UJ co co 2 a < O a) a F- _ = 0 o E o a cU d U d c_"cc"c a= d c d C cu 5n m m 2 °o a w a) C_ CF- 3 ()coo- O 0. = E o -o arc c '( a) c O c wLLJ ❑ ro m 2 2 4 ao a o� �_ S d H = `0 U o - O E- 0 >.0 O° O 0 a) ca -o c -o c a) a O .c .= d .E C7Y�=5 = us 0 2 a o (-) c O 0- a)0 d -o c o N 'E C7 D o _ F - i_- o c a) e o COE7 _ j O LL a d co a L L N a) > C C u°, °w._ �co 1- I T O co cc m m 0 a) V 'O 0 m d ))) 2 2ca 7 0>= a° a.C Q) co JCr)Q t` _` C .? N .? N LL CL D ix 00U E N 2 0 ul D CL 3 0 > coJ❑Q L` M c .? m u_ 0 O u) a) 2.0 = y a_0 (C) J= L` c .? L). 0 Q U) t Q LL C a W U 2 0 co ci '43 O O U- N a) fa H en O To a) T co r N CO r N CO CO T T �N (N CO r N CO r E. N CO T N CO O N C O 0CCC U) I ¢ Q a ¢ a a a I- LLI co g LL rya .- .2 .C co 0 o 92Ia ¢—'`o E n -'r a) 4 C v +- ,,, J y g f] U C) 0 d r N- U7 r O r r CO O r (.Oa) O (} - ,C z co 2 m f- N- a p co co O a r T N- N p a fA o) o a r r N a aO) O r N O co O r N- C rn O T N a 0) O r -. E a�c°i n N fl) C O U E a) 0 0 O C T CO] fp 0> 4-.0 roocv � EE "3 =-o`o ' x N N 0) 7 O U O 00.7., ,c 7 7a a 7 §= •o� 0 a) ._• U co c Lij co (gypV T _ o N 0 O 7 io�o'no'� m ) Ea)T.- c.0 . .. fa a) a) 7 O c O ag a1G 7a <0 < 5J +. 42 [O7 >+ c o com EE • x fn E O ay <=O 0) O al Q r z 7, = f7 U 0 I? N f0 E C 7 Jm N N C N COCa)-0 a c a T [l) •,- eaOa) EE -5 ' X fa co O? U '- a fn y > a a S'M J cc o c O 0 o L) ,ate_. C = o 3 O a)a a) o- NJ NJ 7 a) 3 a) I = X� w L L C O o C O O o f4 .> O f4 .> UU0C UUE N N - 7 • 7 3 O 3 O Na 0a NJ cuJ 7 a) 7 a) 4 L 6 C .C L C U O C O O O f4 .> O f0 .7 UUi UUk -C 7 3 O (1) e- NJ 7 a) = r L C O O fc .> UUE ( C LL o.0u) a)Cl- - a,JZ n3 7 a) 1 a) ti= L� J C O o O O f8 .> 2 UUEC7 N 7 3 O cu 0- 2J 7 a) 4- i 6 C 'c•-a' O fa .> ()L.) ix N ... C o 4)O NJ 7 (1) ,.•= L O C (C-13) O f 3 .> UUo >, _ O 0 2 Q c) o 7 O U o n > 0 _a) • -0 G I) 0 2 a) 4 Q ° N 0 U 7 O 7 O T o Q o- 00 Uo a) a C -O e 1O D D a) _ Q O N U 7 O T O a a)0o N"O c C.DD _ O 0 a _o a) C.9 2 o Q O 7 O o 2- 00o "O C D a) Q -a)a) 7 O o d Uo 17 C n U 7 o 0f C 0 o Lf. 2� faa E U) 'O y 7 13 v. OA O.zco a-0 a- fie fa O to O ft) JY JZa N I o a) 0 a)> f� .7 co .? O UQ UIC7 i �°O 22 -O O -0 c•) 7 O 700 oL O ,_a a 'C a a o LL @ O , , fa > CJ) JZU JO O Q) .. W ' 7 u a) a) u N a) c4 .> > as .� to- U�fl) Ui< 2 — -O -0 = 7 IV 0- o O a) a= 7 it f6 C J� 7 a) 1 Q cL) a)-0 a f� .7 f17 LL UD'fhc!) C a) co a fA 7—L. o co a 7- co o ca Jcna (i% I N U O >o co .? 2 UFcC7 d 4L 7 u) own) a LO M c4 a-' J0) > Q) I `$ ow -c f0 .? .21 Uw2 O `Eru,. U . _ 7 a) a O a) d. V) 7 m a C —I :D a) 1 Q U O 12 a ff) .≥ M LL Uixawu) 4- Ca o •F, y T C d C 0 N C O C LU N O ' a es) OD O W co O N >- } 0 6) 0) z CO O N r co a13) CO iO] r z 0 O ao N c0 U) O ti N CO Cn Q N c = N - a) 0 r-- 0 rn C) r - O 0 0 Cs, 0 N O 0 C) 0 r — CD O 0 a) 0 O 0 0 C) a N- O a 0) 0 N- O a O a) 0 r U) N- O O 0 0 CD C) r 0 0 r T Upstream Limit W L. E a) r O0 wa 0 _ E E m .x ro !` o 2 I lA 0. 3 a) E a) 1 ,- 6 roa azt E E ro 00~ a • 6 ca_ 2, o ro a.) O a) E E 0 •xcaro o 2U n y L Q ) a3 CE End of Detailed Study Downstream Limit C E 0 U a) 3 O cr) C a 0 L_ a) r -0 •30 v a C J 7 a) c ou Cu U CJ CC co d c O O U o Q) E • o �a C � tea) C .0.= a) 0 O a - o c c Im N E c JU End of Detailed Study W E a a) E E o nu n a C O U co I C a) m0 a) L -a 3 a) 0W C @ J 7 C U N O 0 U) ro a) O Q C N o C co H O 0 o 0 o 1 C C N Windsor, Town of O c Co m 0 a) f0 9 C N Q O a to c4 N a) 8 O o 3 C - C Q) ().C LUO Cl, S Ia CO O ) a a. o • U • C C•[4 0> 32 feet above mouth (I) Cl) OS N 2 2 a < O 00 it C • N >' 1 0 2- U 00 0. U o W U "o O E 2 a) E = 19 I a) 'L) 0 o ` O aO CO Of 7 a) ' U N d U cLI) a) O 0 U N U 0 U Coalbank Creek C O 0 a) ro L i c O U� Dry Creek No. 2 Eaton Draw Table 2: Flooding Sou±es Included in this FIS Report CD 0 N CD a N 0) 0 w C, r 0) W Z W Z I Z W Z Z Z Z s to m .. •E Q)•— co L c E a) 0 Cl) J O 0 N O CO N N N-• N O LO 0 C.j c m a 0 0 rn 0 N- 0 0 rn 0 r ti O 0 0 a) C 0 0 0 C) 0 N O 0 0 w 0 C- O 0 a) 0 r E J 8 n ❑ N Q) E o C7 C 30 cooa E E 2a)m° a Cl) n a < < L O as C '- O o o 0 CO 0 a) co L 0 a0 Q N Cl) o a) E E co N N r 7-. ?+ a) O 2 L L a a a Q E E m 2 n Q a Downstream Limit End of Detailed Study 1.7 feet above mouth CD a) r L -0 a) a) 3 O a 2 C X co a)o Qa a a) 't a — O CU QEoU Limit of detailed study 0 ' Co o 2 ro Q a L co d 0 LL C 0 -C C a) C U J Y CV 0 L 0 J d co a) o " U 5 Io o o L) -a C Windsor, Town of U) co 115 C O o U o -a C m•E ❑ Windsor, Town of Windsor, Town of Windsor, Town of Flooding Source Eaton Draw Greeley Canal No. 2 John Law Ditch Ce I pa I t S4 ❑ mEC ❑ o m -o E m Co LL J N L Q_ J m C 0 5 c I- zoo -,W -C I 10- O 2 U - J5 L7 CW 0 AI. LL t o 'm i9 C 0 0) O) r N C) N O2 o0L N Ca w w w w w z z z z z z z n= CYJ E is o y C cn a) O ti O N O ao N O J O C) V-6 c ,= •.�w VJ 5V = m o o 0) O r t` o a a) O r N a o 0) O T ti o a a O r ti 0 w r d ti 0 rn r O r N. C) a r O T r~ C) a) T O T _E E a 275 TA' CD E E� O T E E as ¢_ a) E N 7, Q) E E a ¢= CO >, m iii E E aQ a= a) .E co r >, w m E E an ¢_ a) E CO r 7>, a3 'di E E a°. ¢_ a) E N O ?, a) tri E E 0. . ¢_ al E N T Ti.). to E E a Q ¢= a) t Lo-i O 7, 4) Iti E E aQ a= E J E a) _a) = oO o O 2 a a)�'§o is 0 0a tom/) CJ R a- a) = =L a2ocan.? ¢ E UUd' 2 L 0 a)a CJ a) y= L oM.- UUG C LC+) ON ' ct _c U 3 a) I C U a) ' � o o 0.�IL C _c —I 0sc [0 r Q •O• a, I C o a) w. C:� onjio UJa 2 _ 3o a)0 C J 0 4t Co....'. UUct C LM ON ) IX •U 0 I C C)v, Q) ._ N 4�d o0O U_iIi C 0 L-40 o 0 O i O SUE m I a) C o5.' 0 ..- d�a omco U_i mu- C L 0 3 a) co a) a-. =❑ a UJ C EE E 0 c...) o C O H L uo) -0 C_ 0 2 o< C 0 O -. Sao o E- oU o "C -O C •C_ .C D as 2 o ¢ C 0 o E �-ao o f oU o -O 'O C C_ E n Cu 2 o Q C ms off' LI)E �a`o 'o E cU o 10 -C) C E ' •E Cl) 2 o a cm; o �=0 -o g OU o -0 "0 C C N •E D c`oo 2 < o ao o Q 00 U C 0 .E : 0 2 o¢ C N O .'2 Sao o 2- �U o -0 o C • C .E D a C O '- ,--- 0 -O C a) 0 C oC 0 I� I o io C� 0 -I L" CD LO �C7 I . -= 6 io 3a J y C O 0 —) I y . C 6c 3 o JY C 7y _C 00 O ��11Lj r I is 3 O Q 3" J0 C d L '= -� = I co .. co 31i -IN C LL' _C U °› 3 0 I l .0 0 o 3� JN C L s U >a I 0.3 3P -J I- C cn s a) -0 I ro � a O o 3� J a) C c L - 0 N ti 0 N N- 0 N ti 0 N ti rn ti Cn CO 0 N cc 0 N CO 0 N C N LI . W W W W W W W U) C) E Co J LI) } } z LC) (A 0 0 CD O N N - cc N N r- 0 c =CO cc .Q m W O 2 O V1 0 O LL _d .) to Cp O 0 0 Cn 0 T 0 0 a Cn 0 N- O 0 a rn I 0 co 0 0 rn 0 '3) 0 O 0 rn 0 0 0 0 rn 0 Upstream Limit 2 y z a) E E 2, a a = C0 co d O E Co 2 a U3 CO E co oU u) a) Ea) (,! = C 7, o groUj .,_ •5 Co 0 2 as Q 0 Z" C - _ o CoEa) E •X j a) OL C a o o C Q 00 N. Josephine Avenue L a) U C a) C 0 U I- O a a) a) t C!) a) fl a) a- 0 a) a) J C O a) O Co .? UUE2 0 CA a) U 0D a) o C � OE C E O U U) f9 O 2 c C < C o O O C ti H o o °n oNa)U0 C Y -0 c. 0) •- c Milliken, Town of N a 0 C' - o o. U 0 _ O E Cl) CO a) 4 Q C a) L O Q- �U c°) 'O C a)•C Greeley, City of Firestone, Town of w N 2 Q ro C = o 0 EU 8 p)a C C O •C J > Flooding Source a c co o a m E O 'gyp a) 0 7 J a oQ- aco E C° 0 = I -C( a) 5 J a a) a) L co St. Vrain Creek as 2 co U a) c C 0 J C co CA Cn t 0 t • cn W J U) a) cn 0 i31 O O LL a) I - O .7) co O A '-' O QC N Q co O N co O N N. N - a) N- N. r-- CT) O) 6) r r r r 0) O) r C O C C ii Q< r°)ii U, Q ¢ Q Q ¢ Q co O >- II >- >- >- z >- >- z i N T2 g, E C ° .E �_ C C- T O .-. ,cNi a) •--- ,- co J O 0 r r N d C) r CD LC) O r T r CD r C) LC) N- 6 P V O aO 0 0 0 0 , � O) O) a) _ '0 (7 r r r on 0 0 0 r r r CO O O Q) r O %— M a O 6) r O r co co 00 N- O O O O Q O a O O) Q) 0) O r r [- r O O O O r T r r N O O 67 r O r >, ° () co E E co 0 i a -c C _ QJ r 00 LI7 0 >. E cocoo(0a) a X a C 0 3 7 a� <4=0<4=0 1 0 r N r 0 ?. a) E NmC E y a )C a a) O C 7 a� CL ft C O a) a) • .E O) O O CC) O r r r ?+ 7. ' T ) a) a) a) (V N CC (0 E E E E EE' >7 C0 'X M 'X CO .X i6 O O O O a� a� la_ 7, o_ 7, 13- <7 <7 <a 7 <7 a) E CO T >. m COL0 EE 'X (0 Ott a,, < 0. 7 E C Ccu Co O) C_ cft °J C O "8 7 O O U t o Cl) _c CLI a) G✓ - Q)4- C O (J � r o Cn r V C � 3 C C— 0 03 U CL -p CO w 5 co ai Ln O N o "a co � o 0 7 O" ]. Ip O .0 +. CO (13 •E m� aCi� ° _ +u Cr) 0 7 r7+ 7 O •._ Q C a w m G L) N a N a= O O N .7 O a C Q E U U U � r -O O E .c as +_' 2 � u) C U a [) C: 3 7 aim a) w C J O O V C O C L r s-, O • `) Z. >, C¢ o ° o 3? p U C 3 O .2 E '=y _ 3 O� c 0 E 0,..--0,, o o a O c- C.) a �_ O LO2- o o vi J ate) C'50 o co _c c)a3� iY �,C •;,-77 5 O a) = as C c 03LULLr2c DIY 2 Q O C 0)) 3 m = 0 5-..C.)O 0� C C a) E D 2 Q a 0)) ro =0 O2- OO 12 C a) 'C : 2 2 2 O d ¢ a a 3 a o a o a. o 0 D C 2 C O C F a) 3w a 0 C Z'm rroo 0=0o m = I-02-i-02-,_0I-02-502-,,902- -U a -U o ai0 0 L'V a 4� C i_a C C ,__ a p•_ C a) a) 'E a) C E> 0 C C C C 'E aim a�D zr cnD O N 3 Q O -a I- a) any co 0 0 0 ;1'‘..)o o >_ C C C 'E cf) M a) > c) E ) to {4 co d O > 0 LL En 7 E' (tl Er_ .�+ 7 0) OL CF) 0a 7 E C C C L N N C () u) 0. 0 U o U o m _ C C `C C D (!) = — •l •C a) •'4 in a) Oa a a> a'C t (1) U) U) COO CA H I— I- o o C C m C L o)-= o� p Cn C a) .O N - t a a) LL ■ k U # - � O � 0 O L N 2 . I- %$ 0' 2\ & \ N o_ / C m & N E NJ 0 .C In < k k / \� 2 — z >- >- > Area (mil) (estuaries _or pending) ) a) +=k_= \ -°5 ] q a co w d N d m U\; =q(tg i co k 0 a) k 0 0 0 0 a) a) k k O 0 a) k Upstrea�,ri Limit ° 0 » $ too CD >. w Approximate y 1,500 feet upstrea m Tii E E ( 2 < } ± » CD to E E E E d § d § < g < ± Downstream Limit /k\ � a _ § Is a) 'u 7§ a) CI .0.3 r-oe—i E 6 § a _ % � /B�k c0 2_ c.E as - 0.0.@ 2 ¢�U� 3q Confluence with Spring Creek Tributary E E co c 2 § 0=2 §q 222 3\= 5 $ t, cc 0�7§0 §k / .q 2 Diu_\\ A U 7 O Nunn, Town of Flooding Source I Z. $�� us = © 0-)ce /�0 > § Cig k0 ■ 2u_ >1,p., al » O)$ /C0_ Western Flow Path to Spring Creek Tributary 2.2 Floodways Encroachment on floodplains, such as structures and fill, reduces flood -carrying capacity, increases flood heights and velocities, and increases flood hazards in areas beyond the encroachment itself. One aspect of floodplain management involves balancing the economic gain from floodplain development against the resulting increase in flood hazard. For purposes of the NFIP, a floodway is used as a tool to assist local communities in balancing floodplain development against increasing flood hazard. With this approach, the area of the 1 -percent -annual -chance floodplain on a river is divided into a floodway and a floodway fringe based on hydraulic modeling. The floodway is the channel of a stream, plus any adjacent floodplain areas, that must be kept free of encroachment in order to carry the 1 -percent -annual -chance flood. The floodway fringe is the area between the floodway and the 1 -percent -annual -chance floodplain boundaries where encroachment is permitted. The floodway must be wide enough so that the floodway fringe could be completely obstructed without increasing the water surface elevation of the 1 -percent -annual -chance flood more than 1 foot at any point. Typical relationships between the floodway and the floodway fringe and their significance to floodplain development are shown in Figure. To participate in the NFIP, Federal regulations require communities to limit increases caused by encroachment to 1.0 foot, provided that hazardous velocities are not produced. Regulations for Colorado require communities in Weld County to limit increases caused by encroachment to 0.5 foot and several communities have adopted additional restrictions. The floodways in this project are presented to local agencies as minimum standards that can be adopted directly or that can be used as a basis for additional floodway projects. 33 Figure 4: Floodway Schematic LIMIT OF FLOODPLAMI FOR kI MCROACHED 1% ANNUAL CHANGE 'FLOOD GROUND SURFACE. FL000WAY FRINGE t FLOOD aEVATIOH WHEN CONFINED WITHIN PLOOOWAY ENCROACHMENT FILL FLOD WAY STREAM 4-CIAANNEL� 0 SURCHARGE' AREA QP ALLDWABI E ENCROACHMENT; RAISING GROUND SURFACE WILL NW CAUSE A SURCHARGE THAT W O IS THE INDICATED STANDARDS FLOODWAY FRINGE - EHCHOAC I EST FILL FLOOD ELEVATION BEFORE IDICROACHNN NT ON ELDOOPLAIN LINE A - B IS THE FLOOD ELEVATION BEFORE ENCROACHMENT LINE C - D IS THE FLOOD ELEVATION AFTER ENCROACHMENT `SYIRCHA OE NOT TO ENO= TO FOOT;REW. REQUIREMENT) OR LESSER HEIGHT W SPECIFIED. BY STATE DR CO*NSJNITY. Floodway widths presented in this FIS Report and on the FIRM were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. For certain stream segments, floodways were adjusted so that the amount of floodwaters conveyed on each side of the floodplain would be reduced equally. The results of the floodway computations have been tabulated for selected cross sections and are shown in Table 23, "Floodway Data." All floodways that were developed for this Flood Risk Project are shown on the FIRM using the symbology described in Figure. In cases where the floodway and 1 -percent - annual -chance floodplain boundaries are either close together or collinear, only the floodway boundary has been shown on the FIRM. For information about the delineation of floodways on the FIRM, refer to Section 6.3. 2.3 Base Flood Elevations The hydraulic characteristics of flooding sources were analyzed to provide estimates of the elevations of floods of the selected recurrence intervals. The BFE is the elevation of the 1 -percent -annual -chance flood. These BFEs are most commonly rounded to the whole foot, as shown on the FIRM, but in certain circumstances or locations they may be rounded to 0.1 foot. Cross section lines shown on the FIRM may also be labeled with the BFE rounded to 0.1 foot. Whole -foot BFEs derived from engineering analyses that apply to coastal areas, areas of bonding, or other static areas with little elevation change may also be shown at selected intervals on the FIRM. BFEs are primarily intended for flood insurance rating purposes. Cross sections with 34 BFEs shown on the FIRM correspond to the cross sections shown in the Floodway Data table and Flood Profiles in this FIS Report. For construction and/or floodplain management purposes, users are cautioned to use the flood elevation data presented in this FIS Report in conjunction with the data shown on the FIRM. For example, the user may use the FIRM to determine the stream station of a location of interest and then use the profile to determine the 1 -percent annual chance elevation at that location. Because only selected cross sections may be shown on the FIRM for riverine areas, the profile should be used to obtain the flood elevation between mapped cross sections. Additionally, for riverine areas, whole -foot elevations shown on the FIRM may not exactly reflect the elevations derived from the hydraulic analyses; therefore, elevations obtained from the profile may more accurately reflect the results of the hydraulic analysis. 2.4 Non -Encroachment Zones This section is not applicable to this Flood Risk Project. 2.5 Coastal Flood Hazard Areas 2.5.1 Water Elevations and the Effects of Waves This section is not applicable to this Flood Risk Project. Figure 5: Wave Runup Transect Schematic [Not Applicable to this Flood Risk Project] 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas This section is not applicable to this Flood Risk Project. 2.5.3 Coastal High Hazard Areas This section is not applicable to this Flood Risk Project. Figure 6: Coastal Transect Schematic [Not Applicable to this Flood Risk Project] 2.5.4 Limit of Moderate Wave Action This section is not applicable to this Flood Risk Project. SECTION 3.0 - INSURANCE APPLICATIONS 3.1 National Flood Insurance Program Insurance Zones For flood insurance applications, the FIRM designates flood insurance rate zones as described in Figure, "Map Legend for FIRM." Flood insurance zone designations are assigned to flooding sources based on the results of the hydraulic or coastal analyses. 35 Insurance agents use the zones shown on the FIRM and depths and base flood elevations in this FIS Report in conjunction with information on structures and their contents to assign premium rates for flood insurance policies. The 1 -percent -annual -chance floodplain boundary corresponds to the boundary of the areas of special flood hazards (e.g. Zones A, AE, V, VE, etc.), and the 0.2 -percent - annual -chance floodplain boundary corresponds to the boundary of areas of additional flood hazards. Table 3 lists the flood insurance zones in Weld County. Table 3: Flood Zone Designations by Community Community _ Flood Zone(s) Ault, Town of A, X City of Dacono A, AE, X Eaton, Town of A, AE, X Evans, City of AE, X Firestone, Town of A, AE, X Fort Lupton, City of A, AE, X Frederick, Town of A, AE, X Garden City, Town of X Giicrest, Town of A, X Greeley, City of A, AE, AO, X Grover; —Town- X — of Hudson, Town of A, X Keenesburg, Town of A, X Kersey, Town of AE, X LaSalle, Town of AE, X Lochbuie, Town of X Longmont, City of A, AE, X Mead, Town of A, AE, X Milliken, Town of AE, AO, X Nunn, Town of A, AE, AO, X Pierce, Town of AE, AO, X Platteville, Town of A, AE, X Raymer, Town of X Severance, Town of A, AE, X Weld County, Unincorporated Areas A, AE, AO, X Windsor, Town of A, AE, AO, X SECTION 4.0 — AREA STUDIED 4.1 Basin Description Table 4 contains a description of the characteristics of the HUC-8 sub -basins within which each community falls. The table includes the main flooding sources within each 36 basin, a brief description of the basin, and its drainage area. Table 4: Basin Characteristics HUC-8 Sub -Basin Name HUC-8 Sub -Basin Number Primary Flooding Source Description of Affected Area Drainage Area (square miles) Big Thompson 10190006 Big Thompson Begins at confluence with Inundation River, extends northwest, affecting one third of Weld County 87 Cache La Poudre 10190007 Cache La Poudre River 289 Crow 10190009 Crow Creek 844 Kiowa 10190010 Kiowa Creek t 82 Lone Tree -Owl 10190008 Spring Creek 421 Middle South Platte -Cherry Creek 10190003 South Platte River HUC 8 Basin 1,171 Middle South Platte -Sterling 10190012 South Platte River Largest watershed within Weld County, encompassing the southeastern half of the county 243 Pawnee 10190014 Pawnee Creek 580 Sidney Draw 10190017 Sidney Draw 137 St. Vrain 10190005 St. Vrain Creek 140 Upper Lodgepole 10190015 Creek Lodgepole 23 4.2 Principal Flood Problems Table 5 contains a description of the principal flood problems that have been noted for Weld County by flooding source. Table 5: Principal Flood Problems Flooding Source Description of Flood Problems Big Thompson River July 31 to August 1, 1976. This flood was one of the worst natural disasters in the history of Colorado. In both Larimer and Weld Counties, the most significant recent flood event resulted from heavy rainfall spanning September 9th to September 181h.2013 South Platte River Flooding along the South Platte River in Morgan County normally occurs from May through September with the most frequent flooding occurring during June. Major floodson the South Platte River in Weld County are caused by intensive rainstorms or cloudbursts that normally occur between May and August, with the most frequent flooding occurring in June 37 Table 6 contains information about historic flood elevations in the communities within Weld County. Table 6: Historic Flooding Elevations [Not Applicable to this Flood Risk Project] 4.3 Non -Levee Flood Protection Measures Table 7 contains information about non -levee flood protection measures within Weld County such as dams, jetties, and or dikes. Levees are addressed in Section 4.4 of this FIS Report. Table 7: Non -Levee Flood Protection Measures [Not Applicable to this Flood Risk Project] 4.4 Levees This section is not applicable to this Flood Risk Project. Table 8: Levees [Not Applicable to this Flood Risk Project] SECTION 5.0 — ENGINEERING METHODS For the flooding sources in the community, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this study. Flood events of a magnitude that are expected to be equaled or exceeded at least once on the average during any 10-, 25-, 50-, 100-, or 500 -year period (recurrence interval) have been selected as having special significance for floodplain management and for flood insurance rates. These events, commonly termed the 10-, 25-, 50-, 100-, and 500 -year floods, have a 10-, 4-, 2-, 1-, and 0.2 -percent -annual -chance, respectively, of being equaled or exceeded during any year. Although the recurrence interval represents the long-term, average period between floods of a specific magnitude, rare floods could occur at short intervals or even within the same year. The risk of experiencing a rare flood increases when periods greater than 1 year are considered. For example, the risk of having a flood that equals or exceeds the 100 -year flood (1 -percent chance of annual exceedance) during the term of a 30 -year mortgage is approximately 26 percent (about 3 in 10); for any 90 -year period, the risk increases to approximately 60 percent (6 in 10). The analyses reported herein reflect flooding potentials based on conditions existing in the community at the time of completion of this study. Maps and flood elevations will be amended periodically to reflect future changes. In addition to these flood events, the "1 -percent -plus", or "1%+", annual chance flood elevation has been modeled and included on the flood profile for certain flooding sources in this FIS Report. While not used for regulatory or insurance purposes, this flood event 38 has been calculated to help illustrate the variability range that exists between the regulatory 1 -percent -annual -chance flood elevation and a 1 -percent -annual -chance elevation that has taken into account an additional amount of uncertainty in the flood discharges (thus, the 1% "plus"). For flooding sources whose discharges were estimated using regression equations, the 1%+ flood elevations are derived by taking the 1 - percent -annual -chance flood discharges and increasing the modeled discharges by a percentage equal to the average predictive error for the regression equation. For flooding sources with gage- or rainfall -runoff -based discharge estimates, the upper 84 - percent confidence limit of the discharges is used to compute the 1 %+ flood elevations. 5.1 Hydrologic Analyses Hydrologic analyses were carried out to establish the peak elevation -frequency relationships for floods of the selected recurrence intervals for each flooding source studied. Hydrologic analyses are typically performed at the watershed level. Depending on factors such as watershed size and shape, land use and urbanization, and natural or man-made storage, various models or methodologies may be applied. A summary of the hydrologic methods applied to develop the discharges used in the hydraulic analyses for each stream is provided in Table 12. Greater detail (including assumptions, analysis, and results) is available in the archived project documentation. A summary of the discharges is provided in Table 9. 39 Peak Discharge (cfs) Tn O a 7 C0 4 N C CD CO C7 r O r r o O O CO. c)C) U) CD r t0 Ln CO - Ln I C) CO T-- in C N Co CO Ln [D CD r Lo CD CO co - co LO N N co O .- ti CO CO C aU) C 11.. co - . q L a. U T r i e * COD co ai N 000 in N co CO N co in N CO co N CA io Lii C) Co N N r N To a) C C CO D L O 0 4 l CO CD LAC] COD CA N- N N N co Cr) N a) co O N a) co� O N co in c r C) N N in co- r Ln co r To 7 41 C 2 a Q❑ & O Ln M ,_. r - CD co co T N- CO 0 c l O) Li] c'7 r •— N 0)CO N vi r I r r Li-) N L() N- C� r CO ":1- C•') 1%— To c C C CU L ,'"E' e x « CO D) co N- 4 - O Q) a N N in O in co CO N r O CA CO Co - co To Cc m o \° 0 N C) ..,— V N CO ' LLn N 4 co co 4 CO a))_ V CO cc 4 r CO - 4 f -- A CD 4 a Ifrl CO C 2 CIS co I) CO @ [D d ..r COO C CO V CO T Lo CO 0N0 co 00 i 1.1.iO) r 00 CD N L- CD CA T CD+ L.0 CO CD CO T C co oo J 7 o 2 Q O a Oa) E a) t3 RI U) L C 3 32 o ❑¢ O L 2 ° Eit- () y a) o w aa) ❑il D _ rC - LD ) Q' ❑ a Q65 O coCn L U ou a) 7 c a) C O m cia a) J O N LO can fin a CE 30 OL ❑H J a) E 2 Ea a a. y E w o aL ❑I— Lo r °o N Z. Q"'C a ¢ 04 co > C "O 3 T La 0 ° 0c�._ N co -.Z. -4- To' L64, g a) — ,_ C N LnL- N C o a Ca a) `� > +`+ co (n0)0 ain� ❑co o L 3 N ? 7 w c a a E L.) 0 L <H a) 0 7 N a) p U 0 O f0 }s L.-- U)L ae- ❑ 3 co 0 C 3 O 0 Q a) 4 o to 0 ,.� 2 O v L ¢ El 0 o L < @ 0 U Lcil < 2 O U L < a) a C COQ) 0 I- CD CE `a) be C UU) E O M CO ca a) C N a O H C Co a) I C 0 0 H CJ) Co 'or) ix C UU)) O H L7) Cs i d) E C 0 +_. 0. n O H CO cm ll E c.) Y d) U a O cam Y `) U 0 *Data not Available Peak Discharge (cfs) a c / / <\ C k q CD C / & CD & CD N \ N a) q \ N TO =i& o E C zi O <2E C /0 - • , - - - - - = Ta 8 N C$ § / o CO o O / 7 r r O 7 r O \ 2 o o r O o r o q r O 7 r TO C C < m - m E 0 co m « E c 0 co & 0 co c E e a 0 o w _ 6 a TO c k 1- < 2N- Q c « 0 0 & w w 0 w w 0 w E r 0 r (6 E 0 co w e To c§ O C c in < 2 Lo / Q O ,-- O CD O O U co co- o O CD n O O N- co" o O o + O O O + O O O O O N + + II 2— & ■ ca ns c® 2 a a k Cr & ? 6 a) e \ \ co # / / \ O w \ o / & R o a \ CO LO7 co r % � -a o ix: 0 •�� a� 0k < = o O co m w _ _ )' /% 2.$ 22 �� k� \k cot or 0(..)o o o = \ k \0 E2 2� kf e» 4) co O o 0 _ /�,_ 2k/ k/D 000 000 m (. = o 2 o o 4o /T,• m0 D SR » c o= _o o = C/ \� -\w TA k®^ C=O �_ C - -00 %\» eceCC ❑Uf O 2 2 c_± ° 6 5 72 O o L CO > > U)2 U)2 _ -es _ o o= o n o= u c 00 00 00- Q a _ > a)2 _ -o 00 00_ > 2_ U)2 _ -c o= co o 00_ > a)2 _ o u D = o OM > j- a)2 _ -o u COO 00- > > c j a)2 o 2 _ _ _ _ D o n u= 0 o 0 o o o O CI - a) -C cc cc E Cv « ❑ Peak Discharge (cfs) y c m=& k 0 E CO N R CO N E = c S n S # , , w T o S c O C o 0 7 w , Ili C8 _ C C 2 «2t /U - - K I - * - - - \ R @ - - - Ti c 0 c c / \ S a) _ a C _ q r 2 w r 2 .e -o N "-- o o N C) CO 7 N- + 2 Cr, \ o R' CO \ \ / q N / S \ 6 \ a k to _ 7 ' * , co -w N \ t--- - 5 \ / $U « c \ \ w , - , - * • k w - - K T e, < k / q O T, - N \ + \ + k \ w - * \ 2 I N - a) f§ w) im « 47 6 co N co k k 7 N w CO o sl- - - CO $ | N ? \ Location Upstream of Confluence with Law Ditch North of County Road 62/State Highway 257 South of intersection of State Highway 392/11th Street At Briggs Street Far Tri-County Airport At Confluence with Cache La Poudre River At Confluence with John Law Ditch At River Station 14651 At confluence with St. Vrain Creek At County Road 66 At County Road 70/Greeley No. 2 Ditch At Confluence with Cache La Poudre Flooding Source Cache La Poudre River Cache La Poudre River Cache La Poudre River Coal Creek Coal Creek Coalbank Creek Consolidated John Law Ditch Consolidated John Law Ditch Dry Creek No. 2 Eaton Draw Eaton Draw Eaton Draw Split Flow *Data not Available E' 4R E E 0) w H N t el 21 Pa U la 113 0) CL 0.2% Annual Chance 1% Annual Chance Plus C C ro yZ U T � N co Ch 4 N c.7 N] 2 T 4 v G7) O �� A T C al ,y 8 V N # k k I 1 1 % # # WI c cu c v C c # # # k k # k % # 10% Annual Chance Drainage Area (Square Miles) k k N O N O V 1 c*) oci co r 4 co # # c O .3 8 J Just Downstream of State Highway 382 Just Downstream of Divergence from John Law Ditch Upstream of C&S Railroad Downstream of John Law — West Tributary Downstream of State Highway 392 Upstream of Greeley Canal No. 2 Upstream at Law Reservoir At River Station 565 At River Station 4370 Flooding Source Greeley Canal No. 2 Greeley Canal No. 2 John Law Ditch John Law Ditch John Law Ditch John Law Ditch John Law Ditch John Law Ditch — Colorado and Southern Railroad Flow Path John Law Ditch — Colorado and Southern Railroad Flow Path *Data not Available 'Discharges decrease moving downstream due to split flows Peak Discharge (cfs) 0.2% Annual Chance I | To m / 2 / /Q 4,- 4, 4, 4, 4,' - - 1% Annual Chance N � G _ \ \ \ a) N r 2% Annual Chance 713 7 ID Co < / - • 4,$Q - - - , - - - - 10% Annual Chance Drainage Area (Square Miles) Location At River Station 5675 At River Station 6330 C 7 R / 2� N $ O 2 j\ t Cl CO $t k 0 3 be 0 3 ¢ < j C f k_i a# . -0 0 2 C I /I \/ O» a ¢ ca ~ Ni- § k < L 7 C t k < 5 ' § 6% g 0 0 § cm % Co > O g E c -,-:e 0 < Flooding Source John Law Ditch — Colorado and Southern Railroad Flow Path John Law Ditch — Colorado and Southern Railroad Flow Path IX 13 I\ ga t� 3§ c2 LL _J>s \(0 0C \� -)L -)± I« . 0/ \ \� )E I t\ \ _i CO -,o I gt 0 \� \9. -)o i i 5 7 /ro 0/ \. \% ct coo 00 \0 n -Y Table 9: Summary of Discharges C 0 4-4 Peak Discharge (cfs) 0 CO 7 U N C a) < C) 4 4 4 4 4 4 4 4 4 4 4 CO 7 a} (} C C 3 cr L i a U 4 4 4 4 k 4 4 4 4 k 4 W c u oC co r c0 cf) N- CO) Lo CO O N 1-O CY N N "I- N CD Cfl N 0~0 CO N CO N '• co co 7a) C L.4 Mx L a 0 N 4 x 4 4 4 4 4 4 x Ctl 7 a) C U C c a) S c U Mr 4 4 4 4 4 4 4 4 4 4 4 CU jai C o M L aU r I 4 I 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 At River Station 3695 At River Station 7045 River Station 8235 I u7 co N C O a) a) O N CA C O cr a) River Station 10475 O O N C O C4 U} a) River Station 12800 C L i CD 0 a) c a) U C a O f < a_ Flooding Source I I .(-) L U L Cl- 3a CDJ co J Y J Y C M I C (0 O O O ▪ O -) L ❑ id a. ca J J Y C CD L -O - Y L L L a m J CCD L —) L L 3 • a- m J Y C L O O L 0 J C L D CD d J CU a O *Data not Available Table 9: Summary of Discharges C O Co [) O J Peak Discharge (cfs) oivu o . CV C ea p L ..* * * x 1 * * * * To ct, 7 C N < 2 CL. a U T I M O (0 r a s - C7 ID 0 O N CO CO CO = N CO C C Q .C o C N * -0 it * 1. * x it it CO M CD C U C C * L 4 U * * 1.* x 1, itx * * Ccl C V. C U C C {d 4' P T * * it it * x * * f * it * 1 * * * * * At River Station 2645 At River Station 2985 At River Station 3514 At River Station 3515 At River Station 3825 Flooding Source L I <4 za ❑ L0 Co - J O c U Et L L I Iti I N �a .Ca ❑ 4 ❑ O LL 3 L` c m c O 0 co 0 m L I f4 _c O- .4`) LL CU J f4 C O m - CC At River Station 5163 Downstream of At Confluence with Cache La Poudre River At River Station 9652 At River Station 10057 At Confluence with John Law Ditch — GWD Flow co d *Data not Available Peak Discharge (cfs) (q u N c co c p� o x x * 4, La LU co c.E CO M N- N ci co C) co M ,[OD co co pirCJ o co n 7 a) C 0 N C c 2 d r * x . * a N N- N N O r CO N Liz N N x Nr In Q) a) a) c C 0) N LO M r C9 r N Lc)0 (C) r Liz r CD r LC) (0 LC) r N M LC) r O LC) O C7 r O LoLo CD LO O N c 0 <cu t o{} N * * « x M CO O r M O r r Off)) N d r co T CD C7 r-- O c) N N CD M N CU <c Ca o O e x $ x CO ti CO N CC) N W CD co r o To =a) c U C < () 0 U r * x x * CO CO C'7 M CD CO CO LC) ECO CO C+) r r Cr 1 a) • n. CD W 03 * CD 0) r W LC) CD Li) CO 00 x At Nankeen Drive C O 0 O j O) N l- c -O 0 0 OC L 0 W $uJ a) u_ u_ c I 7 L �+. =oa j 3 Q J LL C a) Q E as N +610 C -0 O N E c N 0 r (� LC) >▪ I 71 5 O N E • Q X 2 a)C O t a Q — co Q a O a N- U) O c a E a) TX N Q O +r C 0. — a• � -F65 Flooding Source L CU ❑ D • LL J a) C_ 0 _c *Data not Available Table 9: Summary of Discharges - J - \ fa \ I g N f R ci C k co co - $ N N J r- _ k N- 7 $ N E J \ $ N 7 3 [ m co Lri I \ Ir C § \/ . 67 co- N- N co / co- N k N k I co N \ k \§ <.(O O ;,-2,-- E n CO N N- n N N CO n + N N N N co L N N N CO U) N Ta <\ $ q a ' k % N- \ k 2 k \ co- N 2 O / Tv C CO C c / \ « ' S S ^ N- r CO CO 7 » 2 C') \ r / co L N CO Cr) 10% Anrial Chance 763 q O N o 03 co \ � N- CD m e o ? CO e co N- co \ CO co - a) n%? C e= 2 ._<( 2 6 , = k N- m N E co a CD w e » e co 7 N CO N co \ Location At Confluence with Sheep Draw \% E 7R oE b\ 2m k3ki§$fI, =R \ 2 $pk k�k�/�\\�k� Ctce nn�-a E 2- =-O� EK'�ac"3$ra n=» o 2/% (/E kkb 0_ a�� Rkk$R),32\k o.) C.) o)O S% >, » % a) # COW § 70 .2 a)Ls t:� 4-$ E 7 &I Vi 000 2 CO mQ Flooding Source Pumpkin Ridge Split Flow Path a) U c p > | a) O c # > 2 O c 7 > \ \ O O c _ p # > > / \ \ O c 2 > .% \ O c 2 > U) k 0 c 2 > / *Data not Available to ■ ■ t co 2 ■ E E 0) ■ . ■ w Peak Discharge (cfs) 0.2% Annual Chance C OS 43,526 43,107 43,499 42,901 Co i § T ac Co 39,446 N CO Co 1% Annual Chance Plus 29,240 29,157 N CO N O) N N � N 28,483 r NN 24,827 G O) N 1% Annual Chance CO N N- N co N Co N N- co- / co- 17,450 CO 16,867 2% Annual Chance CO 2 N 17,827 17,652 17,777 17,536 17,573 @ 3 r 11,431 10,952 / E 2 / /0 # 11,947 G _ CD y _ © R.-..6 11,655 N w N 1O & 6 Co q 10% Annual Chance CO- 6,737 co c N- e CO o O) e CO- k = N Lii $ ct 7 0 C 0 g ) « 00 / O n a O) c CO CO @ N CO w d CO c & CO # 6 \ U) CO \Nr e co Location 3500 feet upstream of Colorado Boulevard (excluding side drainage) At Interstate 25 At Interstate 25 (excluding side drainage) 0.9 miles upstream of Interstate 25 0.9 miles upstream of Interstate 25 (excluding side drainage) Downstream of the confluence of Boulder Creek Upstream of the confluence of Boulder Creek Just downstream of the confluence of Union Reservoir Ditch Just upstream of the confluence of Union Reservoir Ditch Flooding Source St. Vrain Creek St. Vrain Creek St. Vrain Creek St. Vrain Creek - - St. Vrain Creek St. Vrain Creek St. Vrain Creek St. Vrain Creek St. Vrain Creek *Data not Available Peak Discharge (cfs) 65 Z. C N C N c; c.C O CO CO r N CS) COCO O o V 6) C CO I CO) C)) h cv CD CO h C D 1~ ti CO 1~ N. i N lf) ti snld aoueyD IEnuuV %6 N Co N * I N CO r * * * * * + * * 1% Annual Chance CD r CT) r r CO Cr) CO CO in Ni: CD in , CO 1n N CD CD 11) CO N 2% Annual Chance CO co C) O r 4. co.am r N r N C CO Lo r I^7 r• -•N r r C6 O e-- Cr1 LC) U) [ c7 N c. O C) r.-- C) O N O co 1 N. N 4% Annual Chance O CD Cf) co r * * * Y * * * * * N C- o CD r lf1 r * r N r O N r co ti r r Cr) (D r '- r O r r in COCO o r 4,1 L9) td CI 0 C d) 7 4) ❑ -- LC) U) * 4 * * * * * * * * Location Downstream of the confluence of Dry Creek No. 2 At Confluence with St. Vrain Creek At confluence with St. Vrain Creek At upstream side of Greeley No. 3 Ditch At upstream side of C Street Downstream of Hunter's Cove Detention Pond Downstream of Summer Park Detention Pond At upstream side of 4th Street Downstream of HP Detention Pond At upstream side of 10th Street Tributary Inflow (Downstream of 71St Avenue) Flooding Source St. Vrain Creek 7St. Vrain Creek — Existing Lakes St. Vrain Creek Sandstone Split Sheep Draw Sheep Draw Sheep Draw Sheep Draw Sheep Draw Sheep Draw Sheep Draw Sheep Draw *Data not Available ca L C) O CU E 7 iri d Cb I - Peak Discharge (cfs) Iii U c C N C ay a c -c Cr Co 00 CC U) CO CD CD N- mt CD CD CD Co CA CD CD I- 1- CC a) CD C3) tr LC) CD a) en- co 47 N- Ln r CO CD CD 0 CC) a c o w Cw 7 a L a .. U , 4 4 x 4 x 4 x 4 4 t 4 Ri C U C C = U 1 - CD 0 L(7 if N- N CD O l[) Q) C) t t vt 0 Co LU co r CD h r CI") U) a 1.0 OD Lf) 00 CA '7 Ts C U c c < t e_c N N Co N N. CD CV N- N N N LO CV N 00 CA r N N CO a N CD CO CA r- a) N- C) r Cr) Cn co r r a) CD r Co Co co r To - QC CI x x x x x x x x x i x x Ts CU C Cu < (a ; .C a r r CO co o 00 o N N- co N- a co N- LC) a) cocoCoCD e- co N- LU N- N O CI) LA O (� u') co (6 {b (5 Cn C `) = a) E5<CI)MC ❑ v # 4 4 4 x 4 x 4 4 t 4 C] co J CT) 7 Et O N- L.-- co _T CO C -.. F- U) r ti O C Q E_N CO N -9 ��C -,> Q N > O 0 c N o (0 C .5Q i- fn v 9- O E ea Z 7 cE o> ❑ a @ o V CM _N (O c 5o I- in 3 9 O Oct, c E ( CL m c C in I '� c C C o o CD ❑ 2 ❑ Q c c O. o E e) Q) fn ❑ C0 o° ❑ XI m .-.• . c Y Ca 003 mar= _i c to E CU 92 (A a) CC o> ❑ < a) Cl, a C) - E co CU - al D • r�a ro (A Q ❑ • co - E' CC co CU 3 a2' DI a) 2 0 Cl) co o O LL 3 m 0 a a a) L CI) 3 (`a 0 a Cl) a) t CI) 3 2 0 a N a) L U) 3 m ❑ a a) a) L U) 3 L 0 a a) a) L U) 3 2 0 a Cl) a) ..C CI) 3 (`a 0 a a) a) L U) 3 c2 i 0 a Cl) Cl) L U) 3 cu 0 a a) a) L U) 3 m 0 a Cl) a) L Cl) 3 m 0 a a) Cl) L Cl) Table 9: Summary of Discharges Peak Discharge (cfs) ar 0 CO C N C co O C Co Co c CO in N O (D N N co, r 00 NI_ V co CO N CVO Co Cr) N CO M u) 000 N Co Co N 0 0000 N 0C)) O co r N- CND O cO V 00)) j a) C 0 0 C C O < 2 a 179.. U r x x x x r, U) T m V 0) co N O) V CD T 0) Q N C) N 0) a V Is . U) r ri V r` Co T co- V N- Co T Co V V O CO U) CD Co co O co- V CO N V co - CD a C r N N (U CO - N CND CO co 00 T V 0) 6 N r- CO CND CD Co CND (D Co V 0) N Co CA V 00 6 V N 6 Co TU C U C C ...., N I N- CO r V I- r r coN- N N- L— r N. O V 0) N [D Co Co CO N- r I 0~) N- N V O N V 0) N r Coi N O CO Co 000 N Co Co (4 M TO C C C CIS Q 0 V x x k x O r N C )) CO N N (D T V Cr), N O T N O r N N- N T C)) U) N 'V I- N co C) N TO V " Q co c V a r OV0 V Cr) co M ..:r V N N- N N- U7 T CJ (D D) ti r cY co N- O r CO r C) V r r- N N- LC) T r- N r• U) T V N Co co- M CD CO N U) I r IIII cO N 0 r~ r CO 0) V U) r O O O O r, CD C) O co O O) C 0 •C CC O L L O N CC O Upstream Limit of Study At State Highway 60 At State Highway 85 Flooding Source South Platte River South Platte River South Platte River South Platte River South Platte River South Platte River South Platte River South Platte River South Platte River South Platte River *Data not Available ca t E a) d 25 L- 1' 2' 14 u r5 Y L4 a_ i a o c SV C go < 0 52 M co- co~O N N 0[+7 0 0 co t.„4- M ti o o ti CO co- N co 00 4 CO To o c U uj C C 0 d=a Q L) r co N O o Nr Lo Co * 4 4 4 * n 4 * c e < 2 c U r- M tiCO Tr- N o M Lf) co � r cb cn C') co N if) C o co Id o co N < m C0 N , it.; I Qa N o Q) in v N `41-r Co 0.4 N 01 co N 0 co N o COr V o CC') 1- Sfl = C} c C} c c Q o 0 V" r C) N a •r 4 v N 4 4 4 4 4 4 * 75 < 3 L Z3'9: U 0 r r i 0 co' N r 11) 0) N nr co `CC 1j) N N 1- * N al co fu c Ln .L rr=n tl) Qd Yf 0 0 LL) 0 0)) * W o L1) csi I- Lei 07 0 Li.)* 0 co * M p p J C O OD N 61' U O. U> o t 0) O • w m N r O reU} O,_ > >, 4-, N oC f0 ro =Cu) a) Q. .X C N N m C3 a 2 2 O e C, b C O Mce ❑ uI- a. =<I 7 C > O a ni 0 CC .. c p C) < 03 COO C) c N of a 7 c > 3 O a 'O as Q' c o V of ...1.., c08 CD 7 a co C o U- r =itC) I -y 0 V) I a Y N a 0 '5 a 7 C U) U) Y C) `) U co '4 03 Y C) 2 03 co E 'C C) (n OP Y C) 2 U Q1 E 'C C) co O Y a) 2 U E 'C C) co O Y C) `} U C !3cll 'C .O w H 0 7.) m ,+V+ t z CI O) CO i- O O cC O Cl) CO— 49 C) C) t N HI- -) ) (L' *Data not Available Peak Discharge (cfs) 0.2% Annual Chance 0 Lo r `$ — ,t -r o 03 CI CO 0 CO CD N 1% Annual Chance Plus s s • 4' 4, C C <(IDr a.'"U r a 767 365 CO co ar 2% Annual Chance 907 674 ao uD CO N 0 CO CO C) CD 4% Annual Chance « « « it « m 3 y C c Q 0 � 416 , CO ON) N in N OS cc C 03 W .@< L d '- f+ 3.1 2.7 all N N r C O 49 0 0 J At County Road 13 1 At McClure Avenue At 1 St Street At Miner's Park Pond Overflow At Confluence of Tri- Area East Tributary Flooding Source Tri-Area Drainage Tri-Area Drainage Tri-Area Drainage Tri-Area Drainage TriArea Drainage *Data not Available I er- Figure 7: Frequency Discharge -Drainage Area Curves 1 • • a (sp) albinism aaueip lenuuy %L — — BIG THOMPSON RIVER t Boulder Creek LRTLETHOMPSON RIVER Cache la Poudre River St. Vrain Creek Ds E •i w 01 eo a Table 10: Summary of Non -Coastal Stillwater Elevations [Not Applicable to this Flood Risk Project] Table 11: Stream Gage Information used to Determine Discharges Flooding Source Gage Identifier Agency that Maintains Gage Site Name Drainage Area (Square Miles) Period of Record From To Big Thompson River 06744000 USGS Big Thompson at LaSalle Gage 831 6/13/1915 9/13/2013 Boulder Creek 06730500 USGS Boulder Creek at Mouth Near Longmont, CO 447 6/28/1927 9/13/2013 Saint Vrain Creek 06730525 USGS St. Vrain Creek Below Longmont, CO 424 7/25/1977 9/13/2013 Saint Vrain Creek 06731000 USGS St. Vrain Creek at Mouth, Near Platteville, CO 979 9,661 7/11/1905 5/7/1906 9/13/2013 5/11/2015 South Platte River 06754000 USGS South Platte River near Kersey, CO 5.2 Hydraulic Analyses Analyses of the hydraulic characteristics of flooding from the sources studied were carried out to provide estimates of the elevations of floods of the selected recurrence intervals. Base flood elevations on the FIRM represent the elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report. Rounded whole -foot elevations may be shown on the FIRM in coastal areas, areas of ponding, and other areas with static base flood elevations. These whole -foot elevations may not exactly reflect the elevations derived from the hydraulic analyses. Flood elevations shown on the FIRM are primarily intended for flood insurance rating purposes. For construction and/or floodplain management purposes, users are cautioned to use the flood elevation data presented in this FIS Report in conjunction with the data shown on the FIRM. The hydraulic analyses for this FIS were based on unobstructed flow, The flood elevations shown on the profiles are thus considered valid only if hydraulic structures remain unobstructed, operate properly, and do not fail. For streams for which hydraulic analyses were based on cross sections, locations of selected cross sections are shown on the Flood Profiles (Exhibit 1). For stream segments for which a floodway was computed (Section 6.3), selected cross sections are also listed in Table 23, "Floodway Data." 56 A summary of the methods used in hydraulic analyses performed for this project is provided in Table 12. Roughness coefficients are provided in Table 13. Roughness coefficients are values representing the frictional resistance water experiences when passing overland or through a channel. They are used in the calculations to determine water surface elevations. Greater detail (including assumptions, analysis, and results) is available in the archived project documentation. 57 Special Cor°siderations Flood Zone on FIRM W <4 3< c '3 0 0 O N EN W c 3< 1:1):'='-0 O O EN W c 3 (De= -0 O O EN W k Qs 3< 0-17 O O EN W c� c 3 c' 0 O 0 LL W <4 3 c o 0 0 N LL W <r 3 c 0 0 0 NENE LU Q. 3 c '3 0 0 0 o . N elk cc a ❑ LG Q 0 c.) N- � ` N- --... r r N- a N co N N- O Cl CO N CO r 0 N co r co r O N CO r co O N CO . r CO r E) N CO r r co r a N co r Hydraulic Model or Method Used N U W I oC!) Q S a o W r U t34 W C 2 r° 0 GJ us g C V o g W r I I - W C= 2 co r th a c U It W2 2 O cri CI) a 7 ' c11:3 U 2 0 ui (n 0- 4.c 7 c U w W 2 0 Sri co O- cr 7 c W CO W 2 0 rri Cn Q. < 7 T C aS W 2 Hydrologic Model or Method Used 7 CO CO _ o c6 W 2 Y 0 r W 2 W u� 2 c N U@ U Wo a) =via C!) 7a IL = C N U O U Wow Ir). CO 0 ui = C N omo WO a) 2c7❑ U) 0 N um o Wow 2rh❑ CO a = c N 0 w 0 Wo a) 2cria Study Limits Upstream Limit A Ti) E OL E 2 C1 IS Q N a <c 7 -o w c "0 = 0 c Cp 7 �, O <0 a) C J Z' C O- O 03 O co �, w 2 r CC) Q "a 7 7 . �' E c c 43 7 7 (`p O O J003 E O 4- L.- a) j C m [L J2 Ls -0 w U 7 7 (a o ❑Ua E O . Cl) j C - a) J 0L - w U 7 7 1p O bUa C1 p �- 7 '- O ro dF- Study Limits Downstream Limit +� 7 O E O 0 co ) a) co _c 3 co] _c 3 U> C I cEt c--. O@ Ud m . 7 Six 0 c c 0 c a C O O 01— C!) L 3�c 0 C 2 a)0 c O r 0> s = C/) _c 3 cwi c �E c O( 0C w U co 0 L w 3E c Cl) c c0 ca O co UJ w U @ 0 y Cr) 3P c0i a) c c0 ca O co UJ a) U co U_ t Zr) iv O W C >> ca O co UJ Flooding Source 2 o 2 s N Q O a E o ' o,7 0OiE a o c (#)0.'— E � s I- '(7,, co > COOL: w a) U j o 00 2 O a co w 0a) co .> UQ 2 am s W a L N �+ JCO Oa as ' (1) c cLi�a1)aci co .> 7 7 O1X<<O O d "� 0 E 7 CL 7 J as a) O +� 7 a) ' U) G 0w3aa co .≥ or) LL OCpC) 2 V �, O c- a J2 <L w' f1) 0a) co .> h3 UCCJ Special Considerations Table 12: Summary of Hydrologic and Hydraulic Analyses U' 4 N oU- o w ra7' Q �_ 3 C .� 0 0 0 N u W Q L o 0 o N u_ W m W al W m W m a)!=� a)"= -a a)"= -o a) -= -a 0c3_00 030 030 030 N W N I NENE CO CO CO O N O CO CO r O 0 O CO CO O O r r N N O O r r r r C) O L[) Ls-) co) a (n a 4 "g � g q � g Um U0 W LU 2 2 O O 0 u) cn a ) g13 L.L g c , C C U (13 U CU U al W W W 2 2 2 f!) ui 0 c (-4 Wnj o 0 2cYi0 co a u� =0 2 N 0CUo W o a) 2 M O TS CCN 0 C13 W 0 a ) =rriO U] 0- cfi o = c (3cou Wow 2(6CI U) 7 0 CI) 0 o cn 043 _ 'C N = C N C N ca (a ns o o N W O N W o O 2riO 2cei 2criO E {,r) Upstream Limit L 7+ a) 3 N m Oa) ? E y E J ir X N [0 a) 4? a) a E L '- U -o 0_ O ca o < o c o U L() CO A 0 >, N E (4 0 E E a) L L_ X O a1 2 N c' (I) "0 a) <c.0 -a2 as¢ C O U a) a) c E E J CD C V) o a) a) L L U 0 co co U U w r a 45 a) ) U) U, u a) u 2 a = o "Ea ca o UJ 0 J 0 0 0_ N 14th Avenue "O CO '07) > vi E c C 2 CU O O U J U CO a) a) L L U U co co U U i w j U N U 2 a)-3 a)c O 2 o c a C d 0 ca 0 J 00 J a) L U l0 0 s U C a) m U 0 Ca 0 03 UJ Flooding Source d t 0 a Jo a) ' I- U a) UCC Y w 0 y, c a = 0 0 co CL 0oa a>u) JZ0 JZco JO aa) a) a) ' ` a) L C m.? �aa cua.? i- m.? 0� A(!) UCCV) 0I < O � y c c ,s• 00a) d = 7 tv N C J o N 0 O d co ? 7 a 0 can CO 0 O N M O JCOO JU) W ' -0 W , U 3 Ca aU a) -c co.? mu ca.?.0) 0r:t' u) Ore2 Special Considerations Table 12: Summary of Hydrologic and Hydraulic Analyses N"- 13 LT - O O 0 L co c_V tb w T Q L 3 a) -0 NiO • O w w QQL3 CD 0 .. C O O • 3 0 0 3 0 N E N LE 03 C Co w '' Q L c 3 O o 3 0 i U) 0 N 03 N 0d r 03 N 00 T 00 C N 09 O C) CD T a a) Qa 0 Lt) U W _ 07 0- 0 ca w z 0- J a (U U w 2 c1 U w _ CD Ou7 7a = C N co Wao I (Yi O A E E J E >. L >, a? ,� 3 .6 cD 0 N 7 CL .;c' U) OE 4) a) 3 a) a(ao°o Q o 7 t.) U 2 T a) a (o E ECr= x = ` OL E•, -O_ 0. q) 7 '- 0_ T t1 0 @ Q o: H- L U) • N a) • ,_ N 0,7 o O a) E U) E CL E N E C J �A E .° E °)L O_ U) 3= Q y c o. O_ 0 _ 0- n 0 <0 7 CL H< C 7 U U (15 7 O CL 74 E J Cl) Downstream Limit a) L U to U L �3 > U W -o a) 7 7 0 E 0 UJ a) L U (U 0 L a) U a) C 0 U 0 CC `) U 0 a. as J Flooding Source • E LL 0 Oi d r0 -0 a J O U U CC o U 0_ N 01 CU 0 a E C C O O 000 End of Detailed Study a) `J U U) 0 0 Y a) 2 U To 0 r_) C c 0 a, C U Table 12: Summary of Hydrologic and Hydraulic Analyses a, c2 IL o c O o L W • r c0 N 0 0 LL W W c� < < . c c ? 0 N N 0 LL ti O) O Cr) Cr) t 0 2 o 5 2 = a u a, 4 0 4} z m S N U w 2 N U W 2 A U) 7 0) a) co 0 ,E E o • Cr) N < N 7 T TD (o E 'x 0 �_ 2 a E a'a < O 7 E E a T 0 a) t U co U a) o a`) C a) 7 7 0 "Ea 0 Uco C L 0 L_ C L 0 c 0 O_I Flooding Source Coalbank Creek W Q 03) 13 c� NO $ O LL Q W N a, Q 3 a) r= "O N Ni0 00 W W W Q Q O a c ill a) N 0 0 N N co a Co CO CO E) r N N N r r N N w w 2 2 O CD O w Cr) 0) a) O) O) T r r r r r 1 • 1`J iriO g co 0'0 W C 2 (1s N U W 2 N U W 2 N N W W 2 = L() W 2 Ill 0) L L = 7 N Cn 7, U) 7, C!) a) CA a) 7 C/) m 2' m O = C U m >, a) co 0 E E `Ea22 aCO a °0 a < N 7 Confluence with Eaton Draw >, 7, A a)) a):) E0E EcnE E 'E X a) co 'R ) O RI) co 20E o'E> 2 E 2 con a17 a a °p a o_ NI a < r 7 < N 7 ¢ r 7 32 feet above End of Detialed Study 1.7 feet above ECo co co co tti 3-c o 02 U) L V CO co U r t a) a) .0 C xcoa) O a a))'.E o <Eco a) N 7 O a co J Limit of detailed study Dry Creek No. 2 Eaton Draw Eaton Draw o — Z Cn To ro O ❑ N C O Tv 0 LULL ON John Law Ditch I -a co t O E a) c O _C - 0 O O(I) Table 12: Summary of Hydrologic and Hydraulic Analyses LOMR 21-08-0099P E k N \ \ < < N N w k N w ( N w 0 N \ \ \ CS) k / 0 I I O w I / U E I w 0 N k \ U L I & E N & E N k / (N / / O I / O Ui I .Q 7�= :? 2 / / \ / 2 / 2 / \ / \ / / / E >, >,f = 2 e ro ca o& .leE E_E o§ .1 §/§ • §Jk§E/ co cl. k�. Q. k $'"E «�_ <01=<d= E # / Downstream Limit / -c O =Q \ C=C0- 2 Ek\%/ <=u_JL O '0 \$ C\ =0 \\ o E f Q� F 2 Id.. �\ E c # 2em� o 2 o O- < o_ocu Flooding Source �t 1 02 \$ cw kE 0_ CO O a) E— E.E w E § k § § f / O -o% (3 - au") n a= n <n:<4= \ _c 50 \2 O CC § ES % 2 / < \ / k $ 0 O co O g_ 0 CO _1 / I Special Consideration f4 fe (0 c (4 (U tz < Qs 3 < c 3 Q. 3 ¢= 3 ar 3<= 3 ¢L 3 a) a) . v a) c 4)--v a) v m v 0) . -o a) • v 0 OO -. 0 O 0 O '' O COO $ COO _O CO 3 00 OO N N I N U_ N I N I N I N W N I m d.7 co di a O E c o 0 0 ti N- C N N CO n a N ti 0 cc N N ti C N CO N ti 0, ti 0) cc 0 co U W 2 N U W 2 cn r c0 r r U) C3 O < O O < iri ui Sri u7 x coCJc>. coUg cnU0 cnU0 Q W r W r Wc.' � wr '5 2� ur 2 nt 2 v Uv 0-o 0 o Uv W C W e W C W 2 O 2 2 al 0 N U W 2 N U W 2 U t� W 2 a) U) U) U) U) U) '-° 2u) 2in 2 L tj r) U U c6( c W W W W I I I = 7, a) U) U) 0-C o _ -C N 0 o W O a) M 7+ E J a) > EC Ct E N 2 a E L:1- N. a Q r 7 t C O c ro N E c °Ja(t3ir L .N N ca a =ate E 0) a) co � C N a) tea) C cc > u) < N a) E >. to O MOcn 0. < L[) 7 a) co E E. E 0 • E m ac <Ln jI en J cn Downstream Limit c O 0 o U- a O O Uc U I L_ C 7 0 O Ucocm ma c s m L_ L_ N 3 E a) a) c a) a) 0 a ki=❑ =E C 3 CO 0� UH N. Josephine Avenue m J _c Iffy c — 7 a) 2 a) C L C O Ct a) N a) 7 n L 7 .-, c C O 7 a) UH ci)< 0. a) -0 ro U) 0 7 L ,.— � j cr 0 U a) a) a) a) 41 7 J E 7 Ce a a) C 03 C d C ❑ l6 UO L_ U_I 0 nooding Source .c 1 io U a c o r a O o E J a) L C•— a) a) J •c C a w(a E o O .� a) N a+ .? a J Q U) c n c o a_ as n Eo Ct E(0 u?I- 5 O N a) 16 z .? .? . tom`i2 St. Vrain Creek Special Considerations Table 12: Summary of Hydrologic and Hydraulic Analyses I \k0 N u_ u a) N C 0 N & 0 0 N Lu -t co o k a) N w O 0O N \ / / \ CO CO % \ / 0) E § 0) E HEC-RAS 3.1.1 o. G u) %r \k0 &0 o Ind co ±C.ei 0 2 c9 wc) InG C" 0 I _ \ Co m D-� \COO &0o n Imo \ / >, ± R ° 1E$\j Em\k co mE '7‹ r2= PM_$k §kk am k/ E� VIZ 0-� E <�=u<w=u<d= .E o E co 0co </� 7 E E ZIT, O. < CL Downstream Limit .2 > $ / C c 0o 0 _ = I. o 0 ff n m e= -C 3 °° CO a) _ f = @ ° % o 0 (CC kJ E E� = 2= 227 \/ 00_ c 0 Weld County Road 88 k O 0 Z L 0 2c >\ td South Platte River k 0 E co 1 Special Considerations (5 U co � ■ U . 2 2 2 ( I E E _ a) .C I - g2 NJCt\o k LLI (13 < < < 2 C C 0 N N N L.T.O 0 0 ° LU LLI <2 < = =2 OC 0 k 0 N I N I k k \ \ k 0 w _ CV 0 LU I & Q LU I (N 0 LU I / w 0 = I a) C.0 / / a) $ a) a co / { 2 J 'co 0 m stream Limit ❑ownstream Limit a) E U) E \5§E_ >, E E 2 . <o.0= 1) E E 2 2 a� < (N 2 7 ca E_ E EE §J§ 2oI' ao2 ao2 �q � ar0 < C < I E O Casco > '- a) tel 3(3 ,2§�_ 7( -0 >, ko <E 3 < o c k O. co \ \ a § S/ / ■ C ccv ta) 00 00 Flooding Source 7 d / U i0 2 o. @■§ o 2 U) _ccoI ■ » k jw cro 0-� fa 0 >, / ■ a) 3 § / m 3 Et = a" \og <• I = k� 2 __� .■ co c_... @@� RIa #0 ,:lo ii kar= Table 13: Roughness Coefficients Flooding Source Channel "n" Overbank "n" Ashcroft Draws 0.035-0.040 0.040-0.060 Big Thompson River 0.03-0.05 0.016-0.1 Boulder Creek 0.035-0-04 0.016-0.12 Coal Creek 0.075 0.055 Coalbank Creek 0.040 0.040 Eaton Draws 0.016-0.050 0.040-0.070 Sheep Draws 0.030-0.040 0.040-0.070 Little Thompson River 0.03-0.065 0.016-0.12 Little Thompson River - Railroad Split 0.045-0.055 0.016-0.1 Little Thompson River - SH60 Split 0.016-0.085 0.016-0.1 St. Vrain Creek 0.035-0.040 0.016-0.11 South Platte River 0.04-0.1 0.02-0.12 South Platte River 0.04-0.045 0.02-0.12 South Platte River 0.035-0.045 0.02-0.15 South Platte River 0.031-0.033 0.016-0.12 South Platte River Breach 0.04-0.045 0.04-0.1 South Platte River Spill 0.04-0.1 0.04-0.1 Spring Creek 0.020-0.040 0.035-0.080 The Slough 0.035-0.043 0.070-0.090 Tri-Area Drainageway 0.045-0.060 0.045-0.090 5.3 Coastal Analyses This section is not applicable to this Flood Risk Project. Table 14: Summary of Coastal Analyses [Not Applicable to this Flood Risk Project] 5.3.1 Total Stillwater Elevations This section is not applicable to this Flood Risk Project. Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas [Not Applicable to this Flood Risk Project] Table 15: Tide Gage Analysis Specifics [Not Applicable to this Flood Risk Project] 66 5.3.2 Waves This section is not applicable to this Flood Risk Project. 5.3.3 Coastal Erosion This section is not applicable to this Flood Risk Project. 5.3.4 Wave Hazard Analyses This section is not applicable to this Flood Risk Project. Table 16: Coastal Transect Parameters [Not Applicable to this Flood Risk Project] Figure 9: Transect Location Map [Not Applicable to this Flood Risk Project] 5.4 Alluvial Fan Analyses This section is not applicable to this Flood Risk Project. Table 17: Summary of Alluvial Fan Analyses [Not Applicable to this Flood Risk Project] Table 18: Results of Alluvial Fan Analyses [Not applicable to this Flood Risk Project] SECTION 6.0 - MAPPING METHODS 6.1 Vertical and Horizontal Control All FIS Reports and FIRMs are referenced to a specific vertical datum. The vertical datum provides a starting point against which flood, ground, and structure elevations can be referenced and compared. Until recently, the standard vertical datum used for newly created or revised FIS Reports and FIRMs was the National Geodetic Vertical Datum of 1929 (NGVD29). With the completion of the North American Vertical Datum of 1988 (NAVD88), many FIS Reports and FIRMs are now prepared using NAVD88 as the referenced vertical datum. Flood elevations shown in this FIS Report and on the FIRMs are referenced to NAVD88. These flood elevations must be compared to structure and ground elevations referenced to the same vertical datum. For information regarding conversion between NGVD29 and NAVD88 or other datum conversion, visit the National Geodetic Survey website at wwwnqs. noaa.gov. 67 Temporary vertical monuments are often established during the preparation of a flood hazard analysis for the purpose of establishing local vertical control. Although these monuments are not shown on the FIRM, they may be found in the archived project documentation associated with the FIS Report and the FIRMs for this community. Interested individuals may contact FEMA to access these data. To obtain current elevation, description, and/or location information for benchmarks in the area, please visit the NGS website at ww+u.ncis.noa t gov, The datum conversion locations and values that were calculated for Weld County are provided in Table 19. Table 19: Countywide Vertical Datum Conversion [Not Applicable to this Flood Risk Project] A countywide conversion factor could not be generated for Weld County because the maximum variance from average exceeds O.25 feet. Calculations for the vertical offsets on a stream by stream basis are depicted in Table 20. Table 20: Stream -Based Vertical Datum Conversion Flooding Source Average Vertical Datum Conversion Factor (feet) Ashcroft Draw 3.0 Big Thompson River 3.0 Boulder Creek 3.1 Boulder Creek Diversion 3.1 Boulder Creek Turnpike 3.1 Cache La Poudre River 3.0 Coal Creek 3.0 Divided Flow Area and Tri-Area Drainageway 3.0 Eaton Draw 2,9 Kodak Wastewater Treatment Plant Divided Flow 3.0 Little Thompson River 2.9 St. Vrain Creek 3.1 Sheep Draw 3.0 South Platte River 2.7 Spring Creek 2.9 Spring Creek Overflow 2.9 Spring Creek Tributary 3.0 The Slough 3.0 The Slough -Below John Law Reservoir 3.0 Tri-Area Drainageway 3.0 Unnamed Tribuatry to Tri-Area 3.0 U.S. Highway 34 Levee Overflow Channel 2.7 WCR 17 — SH 257 Divided Flow 3.0 Western Flow Path to Spring Creek Tributary 3.0 Windsor Wastewater Treatment Plant Divided Flow 3.0 68 6.2 Base Map The FIRMs and FIS Report for this project have been produced in a digital format. The flood hazard information was converted to a Geographic Information System (GIS) format that meets FEMA's FIRM Database specifications and geographic information standards. This information is provided in a digital format so that it can be incorporated into a local GIS and be accessed more easily by the community. The FIRM Database includes most of the tabular information contained in the FIS Report in such a way that the data can be associated with pertinent spatial features. For example, the information contained in the Floodway Data table and Flood Profiles can be linked to the cross sections that are shown on the FIRMs. Additional information about the FIRM Database and its contents can be found in FEMA's Guidelines and Standards for Flood Risk Analysis and Mapping, www.feEna.goviniedia-library/resources-documents/collections/361. Base map information shown on the FIRM was derived from the sources described in Table 21. Table 21: Base Map Sources Data Type Data Provider Data Date r Data Scale Data Description Digital Orthophoto US Department of Agriculture (USDA) 2017 1: 24,000 Color orthoimagery was provided for the county Political boundaries Weld County GIS Department 2018 1: 24,000 Municipal and county boundaries and Survey Public Land(PLSS) System ( SS) Bureauof Land Management (BLM) 2016 1: 24,000 PLSS data Surface Water Features National Flood Hazard Layer (NFHL) 2016 1:24,000 Streams, rivers, and lakes for the county Transportation Features Weld County GIS Department 2018 1: 24,000 Roads and railroads for the county 6.3 Floodplain and Floodway Delineation The FIRM shows tints, screens, and symbols to indicate floodplains and floodways as well as the locations of selected cross sections used in the hydraulic analyses and floodway computations. For riverine flooding sources, the mapped floodplain boundaries shown on the FIRM have been delineated using the flood elevations determined at each cross section; between cross sections, the boundaries were interpolated using the topographic elevation data described in Table 22. In cases where the 1 -percent and 0.2 -percent -annual -chance floodplain boundaries are close together, only the 1 -percent -annual -chance floodplain boundary has been shown. Small areas within the floodplain boundaries may lie above the flood elevations but cannot be shown due to limitations of the map scale and/or lack of detailed topographic data. 69 The floodway widths presented in this FIS Report and on the FIRM were computed for certain stream segments on the basis of equal conveyance reduction from each side of the floodplain. Floodway widths were computed at cross sections. Between cross sections, the floodway boundaries were interpolated. Table 2 indicates the flooding sources for which floodways have been determined. The results of the floodway computations for those flooding sources have been tabulated for selected cross sections and are shown in Table 23, "Floodway Data." Certain flooding sources may have been studied that do not have published BFEs on the FIRMs, or for which there is a need to report the 1 -percent -annual -chance flood elevations at selected cross sections because a published Flood Profile does not exist in this FIS Report. These streams may have also been studied using methods to determine non -encroachment zones rather than floodways. For these flooding sources, the 1 - percent -annual -chance floodplain boundaries have been delineated using the flood elevations determined at each cross section; between cross sections, the boundaries were interpolated using the topographic elevation data described in Table 22. All topographic data used for modeling or mapping has been converted as necessary to NAVDSB. The 1 -percent -annual -chance elevations for selected cross sections along these flooding sources, along with their non -encroachment widths, if calculated, are shown in Table 24, "Flood Hazard and Non -Encroachment Data for Selected Streams." 70 Table 22: Summary of Topographic Elevation Data used in Mapping Community Flooding Source Source for Topographic Elevation Data Description Scale Contour Interval RMSEZ Accuracyz Citation Weld County All within HUC 10190003 Light Detection and Ranging data (LiDAR) N/A N/A 3 cm 0.6 m USGS 2013 Firestone, Town of; Frederick, Town of; Weld County Sheep, Ashcroft, and Eaton Draws and Tri-Area Drainageway Topographic Contours 1:1,200 1 ft N/A N/A Weld 1975 Weld County Coal Creek Topographic Contours 1:4,800 2 and 4 ft N/A N/A Water 1980 Weld County Kodak and Windsor Wastewater Treatment Plants Topographic Contours 1:2,400 4 ft N/A N/A Weld 1978 BFEs shown at cross sections on the FIRM represent the 1 -percent -annual -chance water surface elevations shown on the Flood Profiles and in the Floodway Data tables in the FIS Report. 71 Table 23: Floodway Data 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) W 0 0 0 0 07 Tr (D 0 0. O. 0 CD O N C*) 01 x 0 0 0 0 0 0 CD C7 r C7 x 0 0 0 0 0 WITH FLOODWAY Lo. thNco, co. rCO. Cr) LC) O)CD(DCDCDM0 C) 0) • Tr 41CDCD 41U)CO u7TrN-000ON N N 03 CO CA r r N nk u) CO CD N N CO CD T— V:, CO CQ CD (D N ti N N N N N N N N NI co Tr - WITHOUT FLOODWAY co 't7 co N u l CA CCl (D M u7 O CD O CD N 0 LC) N co r nk 41 co co u) u) N T— Tr Tr N 00 00 N N- N 00 CO co O r N- LC) CO CO N N CO C)) r CD CO Cfl CO CD N N ti N N N N N N N N CO vv - - -'1— �vvTvTJ:vvTiv REGULATORY 0. c) N 0 0) N) (D M LC) 0 CA O (0 N- O L° C4 CD Tru)0)OOLnu)Nr- TrTr NODOO N N N 00 0) 0) 0— N Tr Lo (D (D N N 00 CD r (D (D CO (D (D N N N ti N N N N N- N N CO FLOODWAY MEAN VELOCITY (FEET/ SEC) TrTrcalrCATr(DL1,r Nc.TrTrNru7 (DCJiV cc; N00Lc1O61Nc'0LnTiQ)COa SECTION AREA (SQ. FEET) rc7NC)C+7 U)L.LTr 00C U) O N r O co 00 00 01 r O nt d' 00 N N 0) r r r N r r CO r r N N r r r X p ~ W 0 W CaCD00CDO CANCD NCV CD 0100 CD Tr0)u7(DNM Mc7M"Tr TrN(DTr(D N LOCATION W U Z Q co 5 00000000 OOOOOOOOTrNetQDntnkOUJ 0e-C7CV e4OOTrNu7(DNO(DCD000 0�L('rNrN�� O r r N co u) co N OD O r r co co ' t U) N CROSS SECTION <c0UawNiCJ2--, -J 2 zOaO L_ 0 m 0 (0 N FLOODWAY DATA FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO CO a W a a W H O a NY O C) z_ c z a TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) w rn cc CK U z rC,T-N ChYrYrC7CrLA, TrN01CACV OD01T-Or 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2? 1— ❑ 0 O LL 41 OD CDCDhsCDCDOCrCAO4101CD 0NCrCDhs41 O O 41 CO T- O1 CJ N N CD N CD CD COCO N M CO r ti CD CD CD O r r N N N CO CO 47 47 CO Cr- r- r- CO CO r- r-NN-Nr-titi�r-N-N-N--N-tir-tir-ti •TrT�Tr-TvvTr- TJ:vTr- Tr- acr'Tr- TNI:' vl: NI: NI: ❑ 0 I- O — O NT6047r`TrNNr-OTrCDMCDODCOtDtOr�� T-Ni47cD,C`70N CK)6, CO6CD oST- rChCDT-r� C7 O O O r r N N N CO CO CO CO CD CD r- ti ti CO O I- ti r- ti r- ti ti r- ti r- r- I• r- r- ti NNNNN TrCr Cr Cr Tr— Ti-- Tr— Tr" Tr- Cr Tr Ti: Ti Cr Cr Cr Cr NI-- Cr Ce O Q J ❑ CD w o yrC7O47hsNtNNr—OTrcri.07 ODODCDCAr41rsYr r YiC(7 CD r CO O N6 OC0 O) CD CO r CO CD r ti O O O O r r N N N 01 CO CO 41 CO CO ti ti r— CO OO r— r— r` r— r— r- r• ti r, N- r- r- ti r- ti r- r- r- r• r - Cr Cr Cr Cr Cr Cr Tr- Tr- Tr- Tr- Cr Cr Cf Tr- Cf FFLOODWAY U Q<0 W O- gww LU > LL1 rr-r-0)CnC77aDr7CAOChOC]DtiCrOD47N47s- (Ni r(NI Cr; 470']N4i0C7r NN(Ni 47NCON47 Z I — O_ Q Lid �wLL W<0 U) Cr) CO N- O) Non N CA CD CO Cr 2 r CO co_ Cr r— CO CO CD C D CDOMCOOCDOODfi2 :Tr 47-Or.CrNc7r"S r0, ii) Ni-47r-Tr CID r —, Lo" r-N-000OCOCDCOYr iI- C- w ❑ w LL NCr MN N Tr CO co NOO C7O) C3 Tr Ct rCO r Ct r- r Cr N- CO O) CO N r- 47 O v CD N r- Tr r- CO 47 CO O N r O CO M r CO_ CO,. 0) CO. Cr r'l O r O Q O N N N r O r r r r r rCrj N N N N N r LOCATION w Z Z C% Ei 60]NCONOOCCOOrO-OOOC O)COCODODCONOCCI OCDCCO O C 1 Cr r- O 47 CD O) 41 CO O hs N cr., CO O CO CO in O �NNNNNCCOC000�7CCOci C74O7]4O)CDCOOCCDDCODN- co Co O 0U Uw QmC)❑WLL0=--YJ2Z00-0WCAI a L U) a O rn C a) Cu a) FLOODWAY DATA w oC z O a 0 I CJ O U) C9 z 0 0 J LL >- V z w a I z w 5 w C, a z a 2 CJ z w C9 w S Lu J w w LL WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE LD CN 6 a c O WITH FLOODWAY CD CDQr N- CO WI OD WITHOUT FLOODWAY W. rave CV C) CO O D7ppr r- OD CO CO a‘zi:vv ' REGULATORY (-4 CO CD CD CD O O r r...- CO CO CO V FLOODWAY MEAN VELOCITY (FEET/SEC) o) c0 r 01. yl CA Nh 01 SECTION AREA (SQ. FEET) BCD 0, OD Yl- 01 a0 07 CD Cn CD N CO) = p ow 1-` r,NOO v i r.,- r rr,-� LOCATION DISTANCE' UCLON CR LD u7 cO r- OD CD OD C) -rnr tiN.N-Oo CROSS SECTION N N W E_ t O U) f a) C) C OU z C C O C) O O O7 N a) LI- FLOODWAY DATA w z 0 U) a 0 H CO W U 0 U) z O 0 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 w w C.) C) O 04* d 0 C7 W • co a> z O z 0 u Ou >- U0 0 D I> ~O ✓ J J �-J w a 7 z z a REGULATORY r O 0 U- Nr 03 C▪ J 03 co 0D ▪ V T— Nr 00 CP r CV C11 Co C7 O Ca CS op cO o3 CQ Tr- FLOODWAY (4 C)* M .— M z P a i= . Cd) U) CD -'j- 2p LU W '—C) 0) 4 CO C)) co LOCATION DISTANCE' CO r (0 Cfl DO N C7 U, r- 00 CI) Z co — cr C1) a) n C O C o Eo Q7 CO • N U 4_ U) N N 7 7 C [D O 7 U A 7 o • 0 0 li ▪ Z FLOODWAY DATA H J a U, M re c) re w re 0 a 0 H w U re I a V z 0 O N- U - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) _ INCREASE O O O O o O O O 0 0 0 r o 0 0 o O C) O O O o ci o O o O 0 0 0 0 0 0 0 0 0 WITH FLOODWAY 00000roo0ch0r000000 cr 0i 00 03 C+7 I- CV C0 r7 a co co l- r mr cr N- 0) CD CD L-Na00OCAO) OOr rN0DM Nr CO 00 00 CD 00 CO 00 CO O) 0 O 0 CD C) 0) 0) 0) 0) 'fla:v'irl: Tr- Tr- Tr- Tr" Tr- �v-a: Tr- T-a:Tr- Tr- Ti: WITHOUT FLOODWAY 0 0 0 0 0 x 0 0 0 03 0 0 0 0 0 0 0 0 NrO('7a00ryr-NCID Cr)CDCr1O0tir V vtr—c) (ID CD r- 1.aoaD0)CDOorrN0]M 1- NI- coa000a00000 CO 00 CS) 0)CDCD0)CD 6') 0 Ti . Tr Ti V T REGULATORY O O o 0 0 r O O O 03 0 0 0 0 0 0 0 0 TrCDC)0Or)1`NCDC7CDCMO3r-rTr V r- CD CD CDN-1-00000) 0)OO rrN 01M crt'f Tr 00 00 0o co 00 0O 0O 00 0) 0) 0) 0) 0) 0) 0) C) 0) C) Tr- Ti: Tr- Tr- Tr- Tr- TI: Tr- '�Tr- Tr- Tr- T•TiV Tr- Tr- Tr- FLOODWAY MEAN VELOCITY (FEET/ EEC) im CD cn vl cV T7 CD NMLC1OTrl[)rO0OTr CDI-:ix; QCf)rrn;roa0 WMO0OOr•-:CR SECTION AREA (SQ. FEET) .. Y « r # « 41 k 44 « Is M * is 44 k .k k = F- O w LL r CM N sr) co co co O co N r r N L- r 01 co cm T- Tr U) O O N 52 O L0 r o CO CD N OD LO N LOCO O CO O 2 M N� CD 00 0 C*) � L� MNNM�Nrr�N NCV- C'7r N LOCATION DISTANCE' CCD TrD0 CD 0) co�M01CDinCV NO3 cCD O(O 00 r 0470))r C0O V 00 0001~[5) rCDr OD ti O r0000)U) Q) _ 05 u7 1� 00 O r r r r- CD NA N N N2 d) CROSS SECTION # # # # * k # # # # # # # % # # # # on BFE locations. Please contact the Weld County Floodplain V a) co • t,) us� 0 c E o v ra E @ L u) o I- .L C - co 3 O o > o LL In 0 Co m 1 otry C)) N❑'a U C l0 C W c '- L O CO ▪ N E 3 cS°i C_ U Q a) C C_ 0 a) 7 0 .0 co N 4) LL. 2 CO u) C 0 N Q) C1) N N FLOODWAY DATA w w V re w J O m w re O 0 Z 0 — J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 INCREASE } O O 20 f- 0 w M Tr. r N M M O M.N. N N r O C).°7 N ; O O O O O O O O O O O O O O O O 0 0 0 0 0 0 0 0 CDti070000OO00CVrCDMCO CO c41V ONtiCIDCID 00 CV(DCpCaCC7C7)CV 470h�f�Jf�rL0Q)ONCp06 ▪ r r N N N CO CO CO Tr CDU) U)CDCDCDN-N-N-N- CID (.D to CID (D CD CD (D O CD CD cD. cD MUD CO CD (D CD CD CD CD CD MO7NCD 47OU7NCANCD N00U")mrOCDMmr47CO N 47 N- Ti U7 CD O Cn C)) r ni ni 0) r CO N- r CD 0) O N CD CO ✓ - r r N N N CO CO CO nr nr Tr Tr 47 4) U) CD CD CD ti ti r- ti CD CD CD CD (D CD CD CID CD CD CD CD CD CD CD CD CD CD CD CD CD CO CD Tr- Tr- Tr- Tr- Tr- Tr- Tr- vTr- Tr- Tr- Ti Tr vTr-vTr- REGULATORY MCr1NCDti OU)NiNco N00Li? OCQM 00 N LD ti Tr U7 CO O C) 0) r Tr Tr 0) CO ti r CD C7) O N CD CO ✓ r r (N N N CO CO 01 mr Tr Tr Tr CC) U) Cry CD CD CD N- r- N- N.- CD CD CD CD CID CD CD CO CD CO CD CO CD CD CD CO CD CD CD CO CO CD CD FLOODWAY MNNCn [AOrONCC)s [DNCDIP47COc C°. co N N N Ch ul Tr U7 CD Tr T- U7 CC) Tr Tr CD 47 47 N M 47 U) Ufl co N CO CD CA co r CA CA 4 i N- CD r 0) O Ni C) CD T- CO CO r N O N ti r 4) N O CC) O O N N- r r r N 0) CO 4) 0) T- CD CO CO r r T 07 N.- N N Tr 4) O N N C) r N co O M co" N r r r r N CD r r r r- T- r r T Nr rr coMLo 47 0) ti CO N 0) C) CO N. N NN ti CO CO mr CC) N c.) co) U7M N -N N- Lo Cf) rN rMNN tirN -Mrr(D N co - --N.(Drrr ✓ r r r LOCATION DISTANCE' ✓ CD NTr000000C))NU)Q)U)CD MMCDODN 4) CO 0) ti O7 co N- N r CO CD N. Ul CO O N O N N CO CD O O U) CD 4) D) O C7) N 0) r r N- N C3) co co t Tr C- co C) CD N CO01 O O CO CA 0 N C"] CD CO C) N M CD CO 0) N ti 00 O N CD N N N N N N 01 M CO CO co nr NT Tr Tr CD Cl) U) U7 ¢mUawu-0i— 2zOaOCC I -D> I- a) ' Feet above confluence with South Platte Ri FLOODWAY DATA oc O w 0- J W a V w U CC O N {7 z 0 O O J U - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 W Cn W CC U Z O In. V.TLo CrMMN NTc70.TMO N O o 0 0 00000 00000000000000 N r0.NNNC'70)O)rno0M ODMNNco. NN r CD O N CD 00 O T- M Tr UP rtl' U)1.- C0 CD Tr CD O O1 d' 0C) CO O CD CD CD 0 0 0 0 0 0 r T T V- N N C)c') T 0OCD (0 CD (0 CO I-- N- NI- I-f-1-tif-f-I-I- I- f - f - f - ti N- Li) O) I- 00 r CC) U) Ul 03 Lf ] O N C) r CO O) r cry U) ti CO U 7 � (D CO r Lo 00 W r C-i c.ci LC1 ai ca N 00 00 CO 0) 0) 0) 0) 0 0 CD O O r r r r^ N N M C") Tr Tr Tr CO CO CO CO OD0000N N- h- r- r- N- N- N- r- r- N - M N - N . REGULATORY C, LD W N, O] r 00 Lo U1 00 U) O N M r CO O r (+7 111 N OD LC) ✓ CO OD r L(•1 CO C3) r C') Tr co I- T- Tr 1.11 N U) CA Th Od O N Tr 0000000) 0)O)0)OOOOOrrr TN NC')C') Tr Tr Tr OD (0 CD CO (D 00 (D I+ P.- N- N I- ti N N N N- N- N- N- N N N- FLOODWAY H W W EL - T ONNMO)ris: co. OLo. co. NLoNco. Occ? r co.r CD Cr) M C'') N Thr N r N C') N C') T T- N T Co N N 00 N OLOCOTrC)COMNL) NCONCN-N(DCO 0 Co Tr N U) Tr co C) N O M T' La co C') N N CO N OD NT CO N co M CD Tr co co 0) M Lo O u7 0 r T Tr CO E0 0) CO ti C3) Tr NLn0)TrNLoioOTr C'ryTrTrLDCDC1Tr(oNNr CD Co N O Co co 0) 03 00 0 Co R 11 .1 4, c) O C) co co I` Tr O ti Lf) r CO Co f") O I+ 00 O, NO"Lt7'ci-N N�1)I�"t- dl )COr�UO� M N T r r r r r r T LOCATION DISTANCE' CO O r N LC) N N Lon ti CD COO in ti CO Lo CO CD (D CD OD rCr) C')(O N-COON- N0N['7 V ONrCDC'')C0OL1•) N-NIn CO03(0OCA Cr) In Ca CD (003 N Ti OC)rNr-co- OTTr- LC)C7007C7NCh(00'ci C ) LC) CD CO co ti N- N N- 4D co 00 00 00 00 co CA 0 0 0 T T- T O ce x> -NV<<<<<<< <<<<<<<<<<< C c a) 1) (0 '5 a) a CO 0 00 a) s 0 L a) t a) 0 C O C CA a) O C CO a) U O Cl) 0) C D O O w L a) .G cis (0 7+ l6 as > O o N � • C O .O C4 .e O • s1 3 a) • c o aau') aa))2E _� 3 a)'al go _ a)L0 LL F— 0 N FLOODWAY DATA oe W oe W a O J W 2 Q W C) O CD z O O J U - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 z I- 4 w -J w w U Q W OC LU D W ga dZ O~ Ow LL W U z a z U _ J a z z Q 0 W rn W EC U z N C") N r r Ca CD Ca %-'- CO U) N r O o o O O d O O O O O O O O 00 CO 00 r CA 00 N N - CO 00 to NT CO O Tr to r- OD N r- CA c7 cd ' nrU) U) CO CD CD CD OD Ps N. N. CO 00 PsPsPsPPPsP~r- PPsr`titiN TrTrTr'vvv��Tr- v N U)CDC)N rNCON.C)N NN. CO COO vr(Oti co N co 00 c+0 co ti ti ti ti N- N. CO CO N. ti Ps Ps Ps N - Ti NI: Tr- Tr- Tr- Tr- Tr- Tr- Tr- �nr" nr-v REGULATORY NU7ODCr)N" rNOON- r~ti OD C)TrCDO Tr CO r+ 00NfOCOC)00 Tr Tr Q) U7 CO OD OD CO CD N. N. N. OD CO P PPsr- r+titititir-r-r- r- V Tr-vTr- TiTr- Tr- d- - - . . .Tr - FLOODWAY H • ~ • W H- U W w OI- • LLU LJW LL • co. CO�C7NMOrr`CO.c? CV CVTr V TrNTrrr-NC`?Cr r- Tr O CD CD N ' CO U) C) N CD c) QD TrC) CO C) 0) 01 r Tr T- CD N U7 N. U) CC " a) C.4 CO N C)TrOO N r r T C7 T N r` r- U) N N Ps 01 cn T- N CA U) C) COrCO 0000 N.UI CV N 000,NTr�CCON QI Nr�u,UU) CO r N N r z 0 a U 0 J DISTANCE' 0))01 NTrNTr00Dti�a)co C)NNUNIOODD O OD U) O CD CD r nr CD C? Tr N C) CO T- CY) CO O) O r C) tr U) C) U7 N. O CO N N N N O1 M CD CO 07 Tr Tr '[r U) U) coco Z 0 I0 U W > ›- ( ❑w ¢ULLOI ¢¢Q ¢�mmmmmmmm 4 C a) U C9 1D CD 0 73 a) 2 4) `�i > co 0D 0 a) O '0 a) a) 0 U O C U) O 13 13 C CD a) U 7 O w a) C 0 O O CA O a) 13 CD 3 L CO 7, i4 CU > O L'Y°o 4 C4 N L .C ▪ C • .Q L � a) N +L. U [A C C U a) Ui • L O mho) C 4) L O W H O N FLOODWAY DATA W re W a a J W 2 a C) C) cc O N i7 z O� O' O J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD/LARIMER COUNTY, CO AND INCORPORATED AREAS TABLE 23 w w w f� — LL — re (1) >- > ~a z •OO O• wu. o LI U. —• UO_ a~ a � al J d w z z d cP C) N 4I ai N REGULATORY FLOODWAY CD LS) CD z 0 I - a O 0 J DISTANCE' N 'Feet above Cache La Poudre Rive FLOODWAY DATA 35TH AVENUE TO w acy 0I- O 0 L 5w w wQ V = N w v cc 0 N C7 z 0 0 u_ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE co M O O WITH FLOODWAY co co 00 N. N- .4-- WITHOUT FLOODWAY LO O 6ti 0 0 I, -o I REGULATORY LI"o xi r--: 0 0 r-- r•-• FLOODWAY MEAN VELOCITY (FEET/ SEC) '- ti NN SECTION AREA (SQ. FEET) CD CO N N C`7 I- r a w LL Cr) CD Cr) In 0 N- LOCATION DISTANCE' O N• T CROSS SECTION am L • FLOODWAY DATA 2 w I z 0 0 wa '2 co W F. w 0� az 5> wa < o 0 1i. wo 0 U) 0 z 0 0 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE 01 . r 0 O O r 0 O O C 7 0 0 0 0 0 WITH FLOODWAY La co N- D 1-vryvr � NNNN -t- WITHOUT FLOODWAY co. ai co. Lr--a �n c) 4 CD TrTrwrnr N- N-N--r-tir-ti nrnrvv �vvv REGULATORY CIOO)OO U[] co N.: r--. aiaiai4 4'r1-ai wtinr- r- r- ti va-v� 444 -NI: FLOODWAY MEAN VELOCITY (FEET/ SEC) Cr'. c9. ti�� ,-000 o 0 . , SECTION AREA (SQ. FEET) u, co r r AD N r CA Lo r LC) - L CO H W ❑ LLl N 0 .00 0 OCD00 a0 N L[] 03 N r IL -CO FLOCATION DISTANCE' Ul I 07 ti N r r.-- r CO NCDN 0_N -CD 0 r rNco- CROSS SECTION W gW , g �W 1 N i5 W a Li-< M O O 2 CL 5 W Q Qco U❑ VO�l— c� pc.❑ aaccm �IXO U Q U I FLOODWAY DATA W a J H 0. < J CO N ¢ a EN LLJ >0 �0 w re �• W O > a� QJw re wo 2 D ¢ a O < ui o W Ot NV C9a zW aN 0 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 W U cn Wo Q > z ow O w J LA - U. O 0 a~ =a U W J J ¢ W z z r r- CI C7 0000 U Z cO CD ▪ CD W CD . . , } 00 2Q ~o LL o urir• cr cc cc cc NI: NI: vv REGULATORY cD cD cD OD -44 FLOODWAY ° Z U • O • W 7IL z I. O <W 0uLWL Q co U) r-- u7 ci c cc, (0 co, W W CID MODI Ch ti (DCOD3OS LOCATION DISTANCE' co)a- N- cn a r N C) u) Q m U 0 'Feet above Cache La Poudre River FLOODWAY DATA 2 H O z w w• a ceLL a O � as JAI O mill c� �O U ui U re O L, z a0 co M O - J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 1 TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) REGULATORY WITHOUT WITH INCREASE FLOODWAY FLOODWAY 4,629.1 4,629.1 4,629.5 0.4 4,632.9 4,632.9 4,633.2 0.3 4,633.3 4,633.3 4,633.8 0.5 4,633.8 4,633.8 4,634.3 0.5 4,636.5 4,636.5 4,636.6 0.1 4,638.5 4,638.5 4,639.0 0.5 Q JQ lJ. Ww Q_ O uJ0W W u- > NwrO) N1-- C) rrNNN Z I- Ill w Q a U) f a r DO O r r N I -W VIII I.L.- rnr(D(.DIll O CO (4) N- C ) ct co NN��O)(NI H a O I 1 0 < co Lo Lo T lal i� M r 6) O N CO (D CO N [O M -, Q 0U UW () <c 00wli FLOODWAY DATA NORTH OF 8TH w w as 0 v 1— w W IX wI = CI) t) U FLOODING SOURCE FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 W O a LL U, CC 63 H0 a> O • w O w J i- 00 O 4 x� O w J W a z z a w U¢) U z �vq OOO H ❑ >- 3O O J LL C. u,ao , CO CO r r r NNti REGULATORY 0 LO CO CrCDCD h FLOODWAY co M. as N (V z O Qw LL W • Q d U) 0) in Cr) CO C7 r r p oW — W CD N 0 c LOCATION DISTANCE' CO CD CO u7 LO ID N N O Ct 'Feet above confluence with Cache La Poudre River FLOODWAY DATA ce M CO w w OC w =• 0- O LL CL (13 w ww =w U> as U FLOODING SOURCE FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE r r M N 0000 WITH FLOODWAY MCOCDr- (O O 00 00 W(0� CO vv.NI: WITHOUT FLOODWAY CO CD 0000 r~ r• r- r CD O CD (D . . REGULATORY NK)ML[) CD CO 0O 00 r• r~ N- r -- CO CO CO CD Tr- FLOODWAY MEAN VELOCITY (FEET/ SEC) , C3) 0 1C? CVrra SECTION AREA (SQ. FEET) Cry r Ln — CO L.D (0 00 C• Q) CO.. r r r %- Qw co CAr-N M CD Cr) trvr-- co LOCATION DISTANCE1 00 cD CD in Cr NCco - .) rC)Lei CD CROSS SECTION QmO❑ I- a) 0) O a J CU L CJ U z 0) C) c m z c O C) a) O m Zia) IL O I O LL FLOODWAY DATA FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE r r co O O O • WITH FLOODWAY Lr) co La f•-: ai N LD coQ CO co Ti Tr- • WITHOUT FLOODWAY TY N IN a) N Ni. CD CD V: V:" REGULATORY Nr N NO)N D CD in FLOODWAY MEAN VELOCITY (FEET/ SEC) N C CO N N O SECTION AREA (SQ. FEET) h. mina) -M , r LL LOCATION DISTANCE LD N 07 rre) nr cro I- N CROSS SECTION 4000 L d lL UJ l(113o_Q) 0 t O Z I- a) > tr a) O CD U CO L_ a) ty m C O C.) a) n O O ro a) w FLOODWAY DATA z J N 2 I- O U) Cf W J ..• 0 CLL O re O. s J W W Q 2ce C.) U W • I 3 0 C, O 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE r - r N M O O O o 0 _ O O C) -J LL o) 47 c O Q) CO 00ff0cO0) O)O)) MtiNN N- �' -:r-cr WITHOUT I FLOODWAY coV.��co COCO ON O MMO)O Nr-N N N REGULATORY CVCDONC0 ) NCO- N- N. FLOODWAY MEAN VELOCITY (FEET/ SEC) T- U) O SECTION AREA (SQ. FEET) - ~CO co Mul "ZrN00 = H o N O) corna�'ocN0N N. LOCATION DISTANCE' arnT- C) N6) DO NMCOr- CROSS SECTION Qmoow C{) A C a 2U d co ,C CU - U co U a U C t N •' c • 3 U 5 9 . O O O cow a� o w H r N FLOODWAY DATA W H H w 2 • a O v a. N J W M W < < C) 0 Z G 0 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) REGULATORY WITHOUT WITH INCREASE FLOODWAY FLOODWAY 4,719.4 4,719.4 4,719.4 0.0 4,719.4 4,719.4 4,719.5 0.1 a 0 O oL. yiLC Z r uJ Q U Lii M -IW >u- v N o0 z P oDw Diu- w¢c• CD CI) LC o �1- 0 LU w w Q Z `0 a o w U Z I- O n ,- N Cl)o 00 Uw CO ¢m N O M OY 0 O 8 0 v U) 0 0 O N O 0 m al a C O O D O N O} C O 0 to 1c 0 a) U @ • O o � N yL O 0 O C C U O C a 3 N C C cu 0 a t 12 FLOODWAY DATA 0 2 a w I- U) a a w LL• a fl wco re H a • a o aw • z w w 2a C) 1 co U co U 0 ✓ o Z O I - J Li - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 r^TOiOTOO T OO OUa6Q00006O 1% ANNUAL CHANCE FLOOD WATER SUI ELEVATION ( FEET NAVD88) REGULATORY WITHOUT WITH FLOODWAY I FLOODWAY 11 TO11)III V?COCAT‘t C) T CO N CO T CD CC CO C) u) CDOCDCDtitiN-OOOO CO CD CD CO CD OD CO CD OD CD Tr- ODC N- ID nt Cl OCOT Cr OnT r`oz; Tcc; COc"I6) Li, CDCOCOCOI� tiCOCO OD OD CD OD OD CD CO CO CO CO m 04 C]f�Ul�VIODCOr-v CO I"- co N- co co 4O ODD CO CID CO UP CD CO CO co Co CO CO CO OD FLOODWAY 1 SECTION MEAN WIDTH WAREA VELOCITY (FEET) (SQ. FEET) (FEET/ SEC) C.1CIO. OV. LE) COTCDCO f-N�COT6DOT(no T T N O O N (O It) Nt TP CS) CO CO O VI0DCO�c ul Nmf� T N NI— T T oo so CO VIVIO1NTOCIN - nr cD cr CON T ID CD co CO -vr C) nr N % CO T LOCATION CROSS rDISTANCE, SECTION Ocoopcm�u)u)CDO 0O COcOap nrN'-CA0O N_N0c,N TT Q) �0,Nr DI�ON�CO T T T T QmO i wu-O=--, 8 O U) 0) C a 0 0 C 8 to v 2 flb 0 a) w 0 v a) 0 C 0 C a 0 ▪ C c m 0 0 CT C a 0 0 q= N 1E 0 a) 4 7 T m 4 0 O 0 a a) 0 = c 0 U � _c°a a) C O c • N O Q 0 CL W .11 m 3 v•D a) F LL N O 2 w I— a FLOODWAY DATA FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 W 0 a L cc co W co W Q � 5z a F - Ow LL, v C0 Q H =a O W J J Q z z a INCREASE O O O O O O O O CD 00 N U] 6 6 U7 IJ N N N N CD CO CO CD ... , Q O❑ =0 H0 5J CD OO N LD 6 U) IL) N N N N CD CD LC) LO REGULATORY CDcooLC) OOU)LL) N N N N CO CO CD CD N FLOODWAY U z -U) ▪ U 2 J• O W LLJ > LL. f� V. q r N O CO Ca CO I- rrCDCD CO LC) O NI N r co T C.0 CO•N z 0 I— Q U O -J DISTANCE' co cD CN,I M� N U) Z (� 0 re• U U w N O a DD 0 Z 0 CU 153 t m U rn u3 0 tv O1 } k 413, 4 0 • O O = co D O u a U L O. � r U CO y "0 2 CU •N CU LL N FLOODWAY DATA I W W re a W 2 C, v W V re O N C7 z O 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE 1 ELEVATION ( FEET NAVD88J 1 INCREASE N M O O WITH FLOODWAY I` C.A. r N Tr Tr Is--N- 'T- WITHOUT FLOODWAY LC)o) tiff REGULATORY r r I, r -- -4:V FLOODWAY MEAN VELOCITY (FEET/ SEC) N 1- SECTION AREA (SO. FEET) , N il O r WIDTH (FEET) I I"— N c0 O M CJ LOCATION W U Z H Cn 0 (.0 Cr) r N CROSS SECTION am FLOODWAY DATA ce W I -- Q en cti W > a �W w I- o• z O a a� �z w w2 =Q Q � O C4 ui oc 0 cn c, z 0 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 FLOOD INSURANCE STUDY VOLUME 2 OF 4 . COMMUNITY NAME AULT, TOWN OF DACONO, CITY OF EATON, TOWN OF EVANS, CITY OF FIRESTONE, TOWN OF FORT LUPTON, CITY OF FREDERICK, TOWN OF GARDEN CITY, TOWN OF* GILCREST, TOWN OF GREELEY, CITY OF GROVER, TOWN OF* HUDSON, TOWN OF KEENESBURG, TOWN OF KERSEY, TOWN OF LASALLE, TOWN OF LOCHBUIE, TOWN OF* LONGMONT, CITY OF NUMBER 080179 080236 080180 080182 080241 080183 080244 080246 080213 080184 080025 080249 080251 080185 080186 080012 080027 *No Special Flood Hazard Areas Identified REVISED: FLOOD INSURANCE STUDY NUMBER 08123CV002B Version Number 2.6.4.6 WELD COUNTY, COLORADO AND INCORPORATED AREAS COMMUNITY NAME MEAD, TOWN OF MILLIKEN, TOWN OF NUNN, TOWN OF PIERCE, TOWN OF PLATTEVILLE, TOWN OF RAYMER, TOWN OF* SEVERANCE, TOWN OF I WELD COUNTY, UNINCORPORATED AREAS WINDSOR, TOWN OF NUMBER 080218 080187 080188 080189 080190 080069 080317 080266 080264 REVISED PRELIMINARY 3/23/2022 t FEMA TABLE OF CONTENTS Volume 1 Page SECTION 1.0 — INTRODUCTION 1.1 The National Flood Insurance Program 1.2 Purpose of this Flood Insurance Study Report 1.3 Jurisdictions Included in the Flood Insurance Study Project 1.4 Considerations for using this Flood Insurance Study Report SECTION 2.0 - FLOODPLAIN MANAGEMENT APPLICATIONS 2.1 Floodplain Boundaries 2.2 Floodways 2.3 Base Flood Elevations 2.4 Non -Encroachment Zones 2.5 Coastal Flood Hazard Areas 2.5.1 Water Elevations and the Effects of Waves 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 2.5.3 Coastal High Hazard Areas 2.5.4 Limit of Moderate Wave Action SECTION 3.0 — INSURANCE APPLICATIONS 3.1 National Flood Insurance Program Insurance Zones SECTION 4.0 — AREA STUDIED 4.1 Basin Description 4.2 Principal Flood Problems 4.3 Non -Levee Flood Protection Measures 4.4 Levees SECTION 5.0 — ENGINEERING METHODS 5.1 Hydrologic Analyses 5.2 Hydraulic Analyses 5.3 Coastal Analyses 5.3.1 Total Stillwater Elevations 5.3.2 Waves 5.3.3 Coastal Erosion 5.3.4 Wave Hazard Analyses 5.4 Alluvial Fan Analyses SECTION 6.0 - MAPPING METHODS 6.1 Vertical and Horizontal Control 6.2 Base Map 6.3 Floodplain and Floodway Delineation 1 1 2 2 13 23 23 33 34 35 35 35 35 35 35 35 35 36 36 37 38 38 38 39 56 57 57 57 57 58 58 58 58 69 69 TABLE OF CONTENTS (CONTINUED) Volume 1 (Continued) Figures Page Figure 1: FIRM Index 14 Figure 2: FIRM Notes to Users 17 Figure 3: Map Legend for FIRM 20 Figure 4: Floodway Schematic 34 Figure 5: Wave Runup Transect Schematic 35 Figure 6: Coastal Transect Schematic 35 Figure 7: Frequency Discharge -Drainage Area Curves 45 Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 57 Figure 9: Transect Location Map 58 Tables Pace Table 1: Listing of NFIP Jurisdictions Table 2: Flooding Sources Included in this FIS Report Table 3: Flood Zone Designations by Community Table 4: Basin Characteristics Table 5: Principal Flood Problems Table 6: Historic Flooding Elevations Table 7: Non -Levee Flood Protection Measures Table 8: Levees Table 9: Summary of Discharges Table 10: Summary of Non -Coastal Stillwater Elevations Table 11: Stream Gage Information used to Determine Discharges Table 12: Summary of Hydrologic and Hydraulic Analyses Table 13: Roughness Coefficients Table 14: Summary of Coastal Analyses Table 15: Tide Gage Analysis Specifics Table 16: Coastal Transect Parameters Table 17: Summary of Alluvial Fan Analyses Table 18: Results of Alluvial Fan Analyses Table 19: Countywide Vertical Datum Conversion Table 20: Stream -Based Vertical Datum Conversion Table 21: Base Map Sources Table 22: Summary of Topographic Elevation Data used in Mapping Table 23: Floodway Data 3 25 36 37 37 38 38 38 40 56 56 58 66 nn 66 67 67 67 68 68 69 71 72 n TABLE OF CONTENTS (CONTINUED) Volume 2 Page 6.4 Coastal Flood Hazard Mapping 6.5 FIRM Revisions 6.5.1 Letters of Map Amendment 6.5.2 Letters of Map Revision Based on Fill 6.5.3 Letters of Map Revision 6.5.4 Physical Map Revisions 6.5.5 Contracted Restudies 6.5.6 Community Map History 120 120 120 121 121 122 122 122 SECTION 7.0 - CONTRACTED STUDIES AND COMMUNITY COORDINATION 125 7.1 Contracted Studies 125 7.2 Community Meetings 127 SECTION 8.0 - ADDITIONAL INFORMATION 128 SECTION 9.0 — BIBLIOGRAPHY AND REFERENCES 131 Tables Paae Table 23: Floodway Data (Continued) 93 Table 24: Flood Hazard and Non -Encroachment Data for Selected Streams 120 Table 25. Summary of Coastal Transect Mapping Considerations 120 Table 26: Incorporated Letters of Map Change 121 Table 27: Community Map History 124 Table 28: Summary of Contracted Studies Included in this FIS Report 125 Table 29: Community Meetings 128 Table 30: Map Repositories 128 Table 31: Additional Information 131 Table 32: Bibliography and References 132 iii TABLE OF CONTENTS (Continued) Volume 2 Exhibits Flood Profiles Ashcroft Draw Big Thompson River Big Thompson River — CR 13 Split Boulder Creek Cache La Poudre River Cache La Poudre River - 35th Avenue to 25th Avenue Pits SFP Volume 3 Exhibits Panel 01P -07P 08P-18(b)P 19P 20P -25P 26-46(c)P 46(d)P Flood Profiles Panel Cache La Poudre River - Downstream of 83rd Avenue 46(e)P Pits SFP Cache La Poudre River - Habitat Lake SFP 46(f)P Cache La Poudre River - Kodak SFP 46(g)P Cache La Poudre River - North Island Grove Park SFP 46(h)P Cache La Poudre River - North of 8th Street SFP 46(i)P-46(j)P Cache La Poudre River - Over 83rd Avenue SFP 46(k)P-46(m)P Cache La Poudre River - Railroad to 35th Avenue Pits 46(n)P SFP Cache La Poudre River - South Island Grove Park SFP 46(o)P Cache La Poudre River - State Highway 392 SFP 46(p)P-46(q)P Cache La Poudre River - Upstream of 83rd Avenue Pits 46(r)P SFP Cache La Poudre River - Upstream of Railroad SFP 46(s)P-46(u)P Cache La Poudre River - Varra Pits SFP 46(v)P Cache La Poudre River - Waste Water Treatment Plant 47P SFP Cache La Poudre River - Water Valley SFP 48P -49P Coalbank Creek 50P -52P Consolidated John Law Ditch 53P iv TABLE OF CONTENTS (Continued) Volume 3 Flood Profiles Panel Dry Creek No. 2 53(a)P Eaton Draw 54-57P Eaton Draw Split Flow 57(a)P Greeley Canal No. 2 58P John Law Ditch 59P -61P John Law Ditch — CO and Southern RR Flow Path 62P John Law Ditch — FR Energy Flow Path 63P John Law Ditch — FRE SE Flow Path 64P John Law Ditch — FRE SW Flow Path 65P John Law Ditch — GWD Flow Path 66P John Law Ditch — Kodak L Path 67P -68P John Law Ditch — Kodak Road Split Flow 69P John Law Ditch — Railroad Flow Path 70P John Law Ditch — WCR 23 Flow Path 71 P John Law Ditch — WCR 23 Lower Flow Path 72P John Law Ditch — West Tributary 73P John Law Ditch — Whitney Flow Path 74P Little Thompson River 75P-79(j)P Little Thompson River Railroad Split 79(k)P Little Thompson River Schaal Split 79(I)P Little Thompson River SH60 Split 79(m)P Pumpkin Ridge Split Flow Path 80P TABLE OF CONTENTS (Continued) Volume 4 Exhibits St. Vrain Creek — Existing Lakes 87P St. Vrain Creek — Sandstone Split 87(a)P-87(b)P Sheep Draw 88P -96P South Platte River 97P-118U)P South Platte River Breach 118(k)P South Platte River Spill 118(I)P Spring Creek 119P Spring Creek Overflow 120P Spring Creek Tributary 121P -122P The Slough 123P -124P The Slough — Below John Law Ditch Reservoir 125P -126P The Slough Split 1 — Below John Law Ditch Reservoir 127P Tri-Area Drainageway 128P -134P US Highway 34 Bypass Split Flowpath 135P Western Flow Path to Spring Creek Tributary 136P Published Separately Flood Insurance Rate Map (FIRM) vi Table 23: Floodway Data (Continued) 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE OO CI CO d-cn O O O O O O O WITH FLOODWAY 6 Lri ul Ln 0 CO O CO titir-nr:r:r- vvVvv�v WITHOUT FLOODWAY T- vt N r- 00 00 tt dua(xi codd06 L) 4000(00(0 tir`h- r`titir- REGULATORY rCrN1-0000 V ul 0 0 0 0 r:r:r:tir:r:r: vvvvvvv FLOODWAY MEAN VELOCITY (FEET/ SEC) Li? o)OMLo. r�U rcONO%—Or� SECTION AREA (SQ. FEET) N N —r —ON OO CO r-O�(�) Cc)tiCANNr—O C')r`NT-U)r�0 Hw ❑ W � ONOr�co�00 N O N O Nr T- N h- T- LOCATION I ZT-U)ONc100)C)3 Q i- d Loco MNOO ��IiOT-O ‘-Cri kri r- CA O T CROSS SECTION amO❑ WLI-C 47) tr v 7 O J Ul U to O C c N C 0 0 U 0 0 .0 ca 15 0 LL FLOODWAY DATA w J re cc w w ce Oa au - o U a U w U O C7 Z_ O O O J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) W co Q W cc U Z O o. r N Ll) O O N T -r pOC] OOp Q = � O 0 J LL r-- (0 MOr NCO c0 00 O LC) (D r-: u c- Ti c r r- 1-- r N M M 00 000 000 U Ln e u) u) U) Ln Ln Dti C) --- 0 � O U - U) N00(D NCD00 N -C) LA6(O NOM 0 0 c O 0 000 u] u-) u) u7 u] L() 117 Lf) D. 0 r... co N00 1D N (D 00 - p0 rrtri r- Nin MM 00 OOO OCJO D 46- u7 LL) LC) LC) LC) u) W tY FLOODWAY 8 aU (OM o]LI100 C.3ON W 0 (?) N- Or d) Li) ti ALL Z I- Qet W I- at()M UJ UclCe. Nr0g0 u~)�N �,� Q 05N r9-1- r N r U) W _ p HW (ON rWM NLLOTt W a00� Nrr rLw)r LL LOCATION W 0 z O LLi N ((N ti C)) 0) Q 1.0 'i-Qc NON NM .4.LI)LCJ a00)O ri) r r r r r r r N �Z u) O N N OF c WLL7J> U W C7 a) W a)0 C U o m 1- ▪ c O )- m 2 W 14 7 O "E-4 o a • O j ° �(n m FLOODWAY DATA w w re O J O O w O O Cl) 0 z 0 O O JI U - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE N OOOO T- CV TrCb U0 T- Tr O O O O O O O O O O O 6 WITH FLOODWAY CVU0004101U3OTrti V00r 4n ti Lf) O) CO O if) O) c+') Ti Ti CO CAOOrNNNCY) Tr Tr L CO CON- NN- f`N- N-f`N- WITHOUT FLOODWAY OCDM40M'TYCOCDCDcnf—N Lf) N- LC) 6 CD O Ti C) N O Ti C'7 00 Tr ul Co CO P- ry tiNn v�v vTr- vTr- Tr- Tr- Tr- v REGULATORY O CO M LC) c+l cr CO O Q) C) N N Lf) N- Lf) C7) CD O O) N 6'• C') 00 C)OO—NNNC+)Tr.crU) CO CDtitiNtitif•NNl-ti �Tr- TI: Trv�Ti-vTIva-cr FLOODWAY MEAN VELOCITY (FEET/ SEC) N7OorNCOON000OCD V 0C) •L—OC')NTiNNNNNC')N SECTION AREA (SQ. FEET) v ti�0)Li) N-Uf)N'-�COC) CNCAr-NONU)Lf)CTiNO N Ln 00 mr CD 00 CO CD CO U0 I- I —W ❑ Lij NOD)NOOC7N-N07Nf- T- TTCDchCO N-OO00r0 N- U) N- 47 00 CD 07 Tr Tr LOCATION w U Z Q CO 0) co CO ' 1 U) r '4- LU CM -COC`)Cr) 001-0)O 00 N N- r U) 0 00 CD CO T7.CN N 1- N V' U7 CD r--00 CD CROSS SECTION <ccoowu QI--) _I Lr 0 a a) L U U 8 L) c 0 c 8 to O O .O m m C9 LL FLOODWAY DATA FLOODING SOURCE: COALBANK CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE co. OOCOv.U?ONC.? OM v. U) 4 Ca C7 N—.1 C7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 WITHOUT I WITH FLOODWAY FLOODWAY V. cg V N(DNOOOU)T 0007 CO V.7O)O)CD 0) CD N CO 0 T 0) T U) co Co LC) 00 CD r CO CO 00 N @0 N Tr Tr U) CDr-000D0)0)0)000 NNN Co CL) CO OD CD OD CO CD CD CO CO ti ti N ti ti ti ti N. r• N- N. r- T V. V.Nt)CA IOrQ CA COO I� Oti Lo. 01 C7) C)NCOU)00) c) Tr U)0)NU) 0- CC Ica U)C0C0T TrcoN COD CDCCCCDDUDDCCDDCCOOCCDDCO COON -N. NN r- r, N r- r- NN r- T Tr T TiT C T REGULATORY TV. NLf)OOCOu)U7OV.CDOtitiv.Oti V.U)N CO 0) N CO U) CD C) C D Tr co N U) I-- C7 O Ln CO CO r Tr CO CV 01 COCEOCCDCOoCCDCEOCOCCDDCDCCOCn N-tiN-r-N- r - r- r�N-tiN-lN ��Tr-vTr-, . Tr- Tr- . Tr" ��Tr- Tr" Ti: Ti: Tr- Tr- FLOODWAY MEAN VELOCITY (FEET/ SEC) ip NT OODO001� N'.Md]4,NcoCDA)N-MTr6) co N LnTTrN c'iCOU7 (-Ni r� 4 U)r4444MN SECTION AREA (SQ. FEET) 01 CD C) N O N N U) Tr O T OT U) N. 0) O co N- CD i U) M Tr CO OD N 0 OD N- 01 CO CD N` N- O 00 Tr in - r U) Co co Tr LC) N Co Co U) Co r U) N- Co r 0 (0 Co N CV CO CD 0) r- r I p HW LL OC~o�MC0oTraODCCCCD C) CcD DOCDCD 41 NOCNDN-N-4 00))0 C�)TC()O TrNLnNNUONNNNN0) LOCATION DISTANCE' O •I J 00 e000LA, r,�UCNCOCOON-U)N- CD CN- ENTr I-U000Ac0TTcoo U)TrCO00Tr00) T- UP 00 Tr LI)TrTrTTC)CDTrNI�Nal. a)U) VMU) CD C7)vim- UjCO11co- O0)OOTTNC7Tr U) CON OD CROSS SECTION ¢mOOWILOI— Y—I2Z00Occnl—=> Cv 7 O a cu J 0) L U @ U 8 a) 3 o .0 C D U 0) } CCJ .r (U a) C a) U C N V E @ FLOODWAY DATA z O a W w Cs O U) a z_ O O J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE CD C) Orr r CO CO 0) 4) OO 00 O U) OD Tr ti U) O OD U) O O r O 0 O 0 O 0 O O 0 O 0 0 C) 0 0- 0 0 WITH FLOODWAY r 00 r OD Tr Tr N 00 M M CO M O N 00 O 00 0) 00 M O Nf:TrU)rrCr; OO6)OOOOCr]CDTiO WOrr 6]0700 NNNNCor)cry Tr N- N OD Od OD 0 cO 00 OD 0 OQ CO 00 00 00 00 00 00 OD Co OD WITHOUT FLOODWAY (-..I U) T- U) Co Co Co N Tr Tr O U1 N- N- N CD T- Nr 00 10 U) r j- C7 Ln r r N CD 0f) CO O) 4) 4) N C9 M a; CA 4) 0 0 C) 0) 0 0 N N Co Co Co Co Tr ti ti CO co CO OD CO OD 00 00 CO 00 CO O0 00 00 OD 00 CD O CO REGULATORY N U) r U) M M OD N tt O L.11 N N, N OO T- Tr OD U) U) r N. 0r) 6 — r N co co CO 0) 6) 0) N CO Co 0) 67 0) 0 0 4)0700 NCV0,0]0001TrTr N Ns 00 OD 00 00 00 00 00 CO 00 00 CO 00 00 CD OD CD OD CO CD FLOODWAY MEAN VELOCITY (FEET/SEC) CD N- up r co CC) CC) 0 CO CD Tr co CD U) 0) CO Tr N U) OD CD U)cc; COTN iri eiOrrCDTrMM4)(044NNr SECTION AREA (SQ. FEET) O CC7 N Co 0) LO U) N N- OD NO) N- 4) 4) Tr Tr O Nr O 0) In O CO O) O r N O NI OO O0 O r 00 OO U) OD O U) CD Oy N CO OOTrC0NrCD Ch—NU)CD00CDU)U)N-N- - I i— p 0 L L. L r Co 0 CD Cos- NN U) 0)O f- Tr CO CO O CV CoO CDCOcMNCD01C')f-Nr Nr0) ON Cr)COOCO7rC) N r 14)N N T- Cl Tr N N N Cl T- N N M Co LOCATION DISTANCE' O0NNN CoTr 60)vN- ON U)0) CCoN ON U- ON co a) if) f--mr NChcn 0000001+Tr U)U) CA r N N N Co Co 'C) U) U) CD CO CO N CO 0) 0) 0) 6) Or CROSS SECTION X}N a°U�w"In, —, -gz00-a ¢a a a aaaaaa<aaaacc FLOODWAY DATA FLOODING SOURCE: EATON DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE 0 N 00 r O O WITH FLOODWAY 00 CI Cl 00 MCC LO if) co CO co m WITHOUT FLOODWAY Co r CCOCO -.S REGULATORY CQ r Cr, Lf) Le) Li" co CO CO FLOODWAY MEAN VELOCITY (FEET/SEC) b' r P- c N- CO SECTION AREA (SQ. FEET) CO N M 03 CO 0 0W ..t -- �rN LOCATION SECTION ROSDISTANCE1 000 CO CO oor r r r CL CO I- <<4 E J a) 0 L1 0 U c 0 61 W 0 0 N 7 C] 1a c11 a� w 1a 0 0 LI- FLOODING SOURCE: EATON DRAW >- U z W ci a I z W W a z Q i) z W 0C W 2 w U. WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION _(FEET NAVD88) INCREASE CV NOrC) 0 0 0 0 0 WITH FLOODWAY La ) 1,1" N O) Oi 0i N Cr) 4 I- 4) (O CO (DO COW CO WITHOUT FLOODWAY Cr)I`4')rO) Cri6) Nr7'I: CD CD CO D REGULATORY Cr) Ih u), O) aiO)Nc')4 V I'InCO(O CO CO LO CO CO FLOODWAY MEAN VELOCITY (FEET/SEC) I— co m u, co NN-civi!` SECTION AREA (SQ. FEET) C+) 03)00O)O f� N O O) O CO ti u7 V- 2 p 0w (Ci(COO1CCr)LO r LOCATION DISTANCE1 r co r 47 r r1OCDO) 14,acamO T r (V N CROSS SECTION Q noOw FLOODWAY DATA FLOODING SOURCE: EATON DRAW SPLIT FLOW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE O01vCL)MCn47MMCt7Cf)Or7Cr 77M47 v.O O Ca O o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 WITH FLOODWAY O) N v. v. In. CD r CD N r N- N M ti M CO r C) CO N 47 ti O N O Tr op Tr Tr N Tr ti Ti r is. O CD r co vr M M in CO CO P- N- N- 00 C) C) O O r N N M M yr Tr 47 CD N- N N- N- N- N N N N N CO CO 00 00 co CO 00 CO 00 00 (0 Tr- NI Tr- WITHOUT FLOODWAY CD.0)OC.N rCD. Cr? CACDCr! I�CDN Tr. N470O Cl N CC] 0 O r O Tr IS. Tr on CO M N- Tr"- N O CD O OD Tr M M U) CD CD N N- N- CD C) co O 0 r N N co co .1'- 0C) CD I-- n r- ti N- N- N- N- N N 03 00 CO 0a CO CO CO co REGULATORY CA C))O9 NrCDM C)(06) NCDN N4)00 NN CC)CD CD ti ti N- N- ti ti ti N- CO CD CO CO 00 ONO CNO 00 OMO 000 OHO 000 OD FLOODWAY MEAN VELOCITY (FEET/SEC) N LL) co 00 C) N N CD r M U) 00 CD N 0 LI) r CC) M O N 0DMChMMulMC7ono1N46NirJCD CDI-c'N SECTION AREA (SQ. FEET) C) CO CA CO r (D 41 r I N Nr CD CD 0 0 co 03 N (D CD Tr O) U7 CC)M'-O00r OrOOF-COC)N-CO'r Tr TrNtM Cr Cr co O 0) Or- on r CO M M M 03 r r u, r N N T17 C"M Cry Cr; Cry (D C*) N C+) 6 co- r N N r N mH 1LU ❑W IL NCpCDO) OTrOMO (N r.... O,1 Tr .g. OD �O�C0N U 03(00 C) N- U) -0 CO up ONTr Nf�Tru)MrCnNrCD000OCOMCDCO� rrrr~�OCnrrCV .L- LOCATION DISTANCE"' CD 00 N'- N- N N Cif) CD N- C N CL/3 UC) N 0) N 2 7 v 7 N, Cfl v O N M 00 C) CD N- N v C) Cn CO M O CO CD O rQ)Ornr0000rCDC)N�000 CDC)r hC) NNNC'7e')M VV V V M CC)Cn CROSS SECTION <COOOLLJLLC72--YJ2zoo_ ctV1HD O 7 C a E O H 0) CYi t a N C C O v C) O C) LL FLOODWAY DATA re w re z 0 Co a 2 0 2 w -J H I- J C.) 0 en z_ 0 0 -J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 'Feet above confluence with Big Thompson River 2Feet upstream of N. Josephine Avenue 3Feet upstream of S. Katheleen Avenue FLOODWAY DATA FLOODING SOURCE: LITTLE THOMPSON RIVER, LITTLE THOMPSON RIVER - RAILROAD SPLIT, LITTLE THOMPSON RIVER - SH6O SPLIT 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE NrC7C7 mr C7 NN CD d Q 6 6 6 0 0 0 0 Oro O O O OOOT- 0 0 0 0 WITH FLOODWAY Cr) rCpNO))OCOCDC7 r co co CA 070 r N M 010 03 OD 03 CD CO cn Q) 03 CO u» SI) Tr Tr C ti ti ti M07Mu7 LOu u3 U) N— N- N - N WITHOUT FLOODWAY I�OCONCn�mrN�M Nrp)C+7C+7C9C'7rr r- 0J CO CO C7 0 r r.,1 c) 00 00 00 c0 CO 01 CO co co COTrTr CDCG0C7 "TrCC) I- I- r- MO)C']� NNC7C) o) u7 u') u) r- N- N- r- REGULATORY r-4CONCr)CDNrr-M N,—oic7MCoMr r- OJ 00 03) O O r N of co co co co o) C) O) O) O) d 0p�Tr 00000 TrTr u) N- N- ti 444 olcn l V NNO+')C*) u)LC)u7LC) h- ti r- ti 4-.44'4 FLOODWAY SECTION MEAN AREA VELOCITY (SQ. FEET) (FEET/ SEC) CJ)c 0000hN00SC)00 oiNuiN-4ti044 T- OD r - cc; 4 rr N N4NN CO 0 (0 co coN-co N- a) CO N- 00 ti CO N CO CO CO r rN-QTrN C)U)C+') vr:NNC7NNco- co- N- co M1 Tr or) T- r[�?r COO or) ul - O I`C*) Cpr ��rN FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS �W ❑ W L!_ ��ph-C+}lC)COr00 �07NCACp(pCC][rJ[O ��u7�� rrr c0 N firN LC)irrL() NNCnr NNolwk LOCATION DISTANCE NOS Co CDO)N 1 co rLC)r�COTrr-000D eDCN)oDCONrI-CnN C+?000No)r 1-O 0000N-N-N-coC0000) NY IA NNN > "TLf,cJ ��COco,0 ' ZdrrN 0 c 0 LLr m P] nm m > NN�C�7 - rNN-N) Z NNNN OJ CROSS SECTION a > K>-N¢¢QQ O J J2Qmo I— I— o uo I-- en H ¢onUa I— F- D TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE T in 00 WITH FLOODWAY 01. Cfl N Acr M M N- N- V- WITHOUT FLOODWAY CC) r N Tr c0 cr) N- r - vv REGULATORY CC)r N Act M M r- r - T Tr - FLOODWAY MEAN VELOCITY (FEET/SEC) CU. T ; SECTION AREA (SQ. FEET) O C7) in M r- in .' H �w �c LOCATION SECTION SS DISTANCE' N r- 0 a a) a) L s (Do C a) m C O O a) 7 O (a 1 L.L. FLOODWAY DATA 2 l— < 0- 0 J LL H J 0 - co W 0 ci 2 z a 2 M a li.i V ac m O co z co O O J LL I FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE M r N cl r M r N 07 Tr N N O O O r O r N O 0 O O CD C7 CD CD O C) C7 C3 C3 CD C3 CD CD Co CD CD CD CD CD CD CD O C7 WITH FLOODWAY COOLD CC) N r 7 M NCO ti [O O7 0] CO O O r t'ry N O OO V' O C D N U) CO. c') ti r st cD CY) CD M CO CY) C1) CD Cr) O) N U7 CO cc CO CO CO N. N, N. 00 00 CO CD O) O T- T- CY) CY) cr cr cr V0 N- N- N., N- N� N- N- N- N- N - NM1 N- N- N- co co OD 00 CO CO WITHOUT FLOODWAY M O C) CJ) O co r"- r CA N U7 CA O) O CA O O 7 N O O O S ) c0 CO CO CO ti ti N— OD COO O) O7 O - CO C') 07 Cr ,z1 -Tr 01 U0 CD 01 CD V7 CC) U N- N ti N. N N.- N N- ti N. h N. ti N- OD 00 OD CO CO CO CO CO CO REGULATORY C•) CAco. CAOcc! NN- r O)N CC) Tr. Os a) OO7OO rCV OOO N. CSC) CCO) Co Q0 CoECO N - N CO Co 0OD co D CD CD CVT- M C) Cr Tr un r- ti ti r- ti r- ti r- ti ti ti N- M N— CO CO CO co co co co co co FLOODWAY MEAN VELOCITY (FEET/SEC) 01 CD C') N T- Tr O T- NL N. CO N M 00 U) U) Tr O 41 CD eq. d' nr ai N N: 00 0i U).' CO CO ai c3 cO ti ti OCi Q) TiN: 6 SECTION AREA (SQ. FEET) C0coN-CDcou,onC0C0NU)CDU1 0 Lo_0co , N` OO) co_cocM M CY7 CO lc x x x x M x ♦ 11 x ‘- Lo- co co- tiL°OOco- OU7CV- rr 1 I- I— Lij CILU 11 ti C)C17T-CY)-ONrO CO O) CArTrCO OT- NOO co CO co M O) ck ti — O 00 0) N 00 U7 M v r O T U7 CO0) 00 N N U) 00 Tr 01 U) 00 CA ti N U) C D ti U] N C7 01 N- Nr N- T- O r(N -N NT- T- T- - N N N N C'r) 00 T- N C') C')'t rLOCATION DISTANCE"' ,C7 r CO 01 OT- 00 CO U7 Cr O CO V0 OD CO CO U) C) T- N CO N N CO T C17 01Tr U7 O O) C) C) r r CD CD ON- N. CO U7 N j C) N CO Cr CO u, Ca CJs co T- N T- N O 0, Tr r 01 CO 01 01 CON" NNNMCOr)COY) 14U7LL)Us7COhNNDN-000ODO) CROSS SECTION a 03 C)❑W u_CDI—-nYJ . « x « V « e « « a Ci) C6 0 L_ O cc L_ CU U C CU C O U U) J O as N Q) LL C .CD 0 70 O O LI a C 7 O U 73 a) N L C6 C O U a) CC) 4) 0 C O CD N O LU LI_ CO C O 7J G) It th .O 13 O C E O C CO co E O .C .c O) A � O O O LL U O CU 7 to 0 70 O CU _O 70 LI C7) ❑ C N �_ O U C C C O N O 1- O 0 O CO E w C O .(13 O O g w � y d N •� C C r E N-ao FLOODWAY DATA FLOODING SOURCE: ST. VRAIN CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 W a Li- te M u o a � Z ow ow -ILL LL .... 00 C.) U.' J J aw z Z a o r w U, z le4,* Is 4e 4r* 4e = � o o 4, 4, 4, 4, 4, 4e 4e. OrI >OJ LL >- o Q J W CC x- oorn� co N cri0) I-: 0 • LC c 'v- C) C•) CD CD F.- Is.00 00 00 00 c0 00 cc cc c0 Co cc O O U. PIJ Z - co gw Wu] `ALL z 12 LU O N LL LQ U CO * 4.* * * * * * _I- ❑ - * R * Z O P. a C.) o WN z co co ❑ a, OD Q0cocoGo- I � O in O OD N_ TTC) St CD C)� 0 0 0 0 0 o 0v OW Cil zOn.O coID a`) 0) O c • 5 d y L � y o 3 -a o o To 00 a)= > >, o co co -o o a)O LL LL * FLOODWAY DATA w w O 9 W v D z a O J LL U z w z p FEDERAL EMERGENCY MAN WELD COUN AND INCORPORATED AREAS TABLE 23 'Feet above Confluence with Cache La Poudre River 2Elevation Computed without Consideration of Backwater From Cache La Poudre River FLOODWAY DATA FLOODING SOURCE: SHEEP DRAW 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE O U) O U) O O M 00 U) N r r 0 O C) r r 0O U) O N r .-6,6 ‘666666666 O 0 O O O O O O WITH FLOODWAY N T- M T- U) 0] N U) T- U) 0O Ch Np N OO U7 0 vr ff» r N 47 0 4 CO - r (p 0) N O 0 N CO N C') (D O C') - U) CO CO O O O O r r r r N C) C') CO CO C) (C) U) CO N N N CO N N N N N N N N N N N N N N N N N N N N N- M: WITHOUT FLOODWAY CO CD OO CO USO0)NCD. 00NCOCrNOvrOCD Cr. CrChr 0) C'7 N 0- U) CO r O O N C) N C) (D 0) N - U) N CO 0) C) O O r r r r N OO CO CO C) oo Nr Nr U) (0 N N P- up (DI�NNNNNNNNNNNNNNNN-NNN V - REGULATORY 0 co co co U7 O 0) N (O O1 N- 00 Nr N O Tr O CO . Tr CO r CO C) CO I- Or Lacd,60 NM N criCOC)(N r U) N- CO CO 0) O O T-' r r r N C') C'0 OO C'0 C'7 Cr Nr Tr U) CD N N N- (0 CD N N N N N N N N N N N N N N N N N N N N FLOODWAY MEAN VELOCITY (FEET/ SEC) O) co CO Ch 0)N r0)NN0)00(DCONC)i N0O0O O1 Nr NQ)0NNNviCnOc C)N 0)MN SECTION AREA , (SQ. FEET) NCCOOONNMC8C�8OPAMC) QI 00 C))U)0C0(0C) W 0)CDN CDCDNNU)(()MCOCOtn(D -U) T r r r FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 2 I^ W ❑ w IL CD 0 0 0 U) O 0 0 C0 0 0 0 0 0 0 0 0 0 U) 0 0 M CO ..4- NNN N- N �' 01 up 0 N r T N CO 00 N 0 LOCATION DISTANCE' N N 0) CO L!) .r-0) CO cD N C— CO `— CO (D C') N O CY) C') 0r, r 00 N CO O r CO O, Lf) 00 C") r in O CD O N r Cr) N 0 N NO N (0C) C) M 0) O U) (0 N CO CO co 0O r 9:72 (C) ) C r CV C+1 05 O1 LCl CD N N co- 0) O C) r r N U) U7 CO CROSS SECTION <COO W U I— Y_i2ZOD-Gixc)1—❑7 TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE 450 12.6 4,779.5 4,779.5 4,780.5 1.0 370 14.6 4,788.1 4,788.1 4,788.6 0.5 405 9.3 4,792.6 4,792.6 4,793.3 0.7 380 9.8 4,798.6 4,798.6 4,799.2 0.6 331 10.5 4,804.7 4,804.7 4,805.6 0.9 478 7.3 4,807.4 4,807.4 4,807.4 0.0 496 8.4 4,809.0 4,809.0 4,809.7 0.7 292 11.7 4,814.3 4,814.3 4,814.9 0.6 426 9.6 4,825.8 4,825.8 4,826.5 0.7 285 13.0 4,834.1 4,834.1 4,834.2 0.1 338 12.0 4,841.3 4,841.3 4,841.9 0.6 305 8.5 4,850.4 4,850.4 4,851.4 1.0 230 10.9 4,850.2 4,850.2 4,851.2 1.0 363 6.0 4,857.4 4,857.4 4,857.8 0.4 736 3.6 4,858.2 4,858.2 4,858.5 0.3 457 8.9 4,860.2 4,860.2 4,860.2 0.0 294 7.5 4,863.9 4,863.9 4,863.9 0.0 387 6.5 4,872.5 4,872.5 4,872.5 0.4 252 7.3 4,881.8 4,881.8 4,882.5 0.7 281 6.8 4,886.2 4,886.2 4,887.1 0.9 626 2.0 4,899.2 4,899.2 4,899.2 0.0 971 1.9 4,899.5 4,899.5 4,899.5 0.0 River WITH FLOODWAY WITHOUT FLOODWAY REGULATORY FLOODWAY MEAN VELOCITY (FEET/ SEC) SECTION AREA (SQ. FEET) W Ii 2 p c CA0r0O�u CDAD Quu CD T•-• Nf11NNON00�D00)00)LoN 0. co J w L LOCATION DISTANCE' U (0 C CDOOI,- re) NI'ODrCr) NrCDr010.L000r0iLOI.0 CDOOONrV NCOCOLOrC)CDrCDrO)co�Ni- LI)cor� r� Cr) N CO_ 'I 1.O CO CD O N CD r CD CO CD COO O CT) O) CO CO M tiCAONNCh cr cci Qf Q)O)Or(NI Nre; U, N- r N N N CA N CA N N N N N N CI CO CO CO C) co C*) C CL CROSS SECTION C (.:: a x>_NvmU❑wIiC72--)xJzOaC�Y ¢¢¢¢¢¢¢¢a¢aa¢¢¢¢¢ ca a. L FLOODWAY DATA FLOODING SOURCE: SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 'Feet above Confluence with Cache La Poudre River FLOODWAY DATA FLOODING SOURCE: SHEEP DRAW 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD8B) INCREASE r N 7 O C11 O O O d 0 WITH FLOODWAY r COOO"tN O O T- N Ol CD 01 CnO0) 4d' -cc .. WITHOUT FLOODWAY O CD f� 0 O co M vr OOr N0) C) C)) CA C)) CA REGULATORY OCD1� O 0 cr C7 M 4 OOT- N CO C)) C)) Cr) CA C)) FL0ODWAY MEAN VELOCITY (FEET/ SEC) C71� CD NO to) up 00 ti SECTION AREA (SQ. FEET) NcoN-C)r O C) -'- C) FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS sp I -w aLLJ ou)u)CCD vLA1COCOCO LOCATION DISTANCE' I0O 00 upC C) N)oti�CO 0 (Df-:I� co- MC')Mc')C') CROSS SECTION Cn H : > TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) INCREASE 04) 471C1�Lo. tt 77MCPIt? NMM 47 M M co c'') 't 4) C) C) C o d 0000000000000000000 WITH FLOODWAY TN�NNM0)Lf)I�(DNCflco. (0.M C1) co. co. r'-'. CDld)0N co Lo T ] N-CN-O00047CMr C1)rM N CO00 T- MN�U) NNN01TrulU)'4)C0U30,ODC)0)00 N NN 07 00U - 4) 4) CC] 41 U) CC) Cf) U) 47 CI) CC) 4) 41 0 CO CO CO CD CO U) U) U) CD '4: "4: NI: .4 .4= TI: ‘1:d sPI1.4: wi: .4: q3 NI: NI V NI: Id: WITHOUT FLOODWAY 7NN-N�CA V TMCC)rNrrr7cp. M 4f)� T NNNN- VI COTrr N,- C) (D CO IC) C') - U) - VO N CO CO r rMl-4) NNN0)-4-0 0U)CD(CN-C 0)000 N NN 07 M0')U)Tr Tr 47 4) 47 4) 4) 4) 0C) 007 017 CL, Li.) CC7 0C) CD U CD 00 CID CO CD CD CD REGULATORY 7NN:N-. v.7MLo. TN'77T7U) M CC)Nr. r N(N!NIh CO T- CO Tr r r N- CA C00) 47 M r 47 r CO N CO CO T r 0") 1- 41 N NNU) Ul0u7 C0(0N- 007) 0)00 N NN M 0007MT0 Tr CC) Lf) U) 4) 47 4) 4) Cf) 4) 4) 4C) U7 IC) CO CO U) U) CO U) CD CD CO CD FLOODWAY MEAN VELOCITY (FEET! SEC) ON-COl��rr(0 on.00010 V)OR07CD T- OM ti I-d'Ir.r 0)NCA07070701U)N C") C") 0") U) - NM N MM T- N CC") SECTION AREA (SQ. FEET) 0 N.-C�7l. 0�000 C) CO U)0T00N- - ti 0Ns N 04) up Ns4) T ti00000ILrOrCV0CbT CM I� T cn CO Tr_ OOCO_ N - co- 0C") (0 U) 01- (QCOM47M4)r O CC)CO T NU)�r r r N N T T T N- N r r r r r T T- i ❑w L 07003 COTrC")00TrrMMCTCU) 0C) U7 CO N O) IC) IC) Ct ONN-C')CD N�C')rC00'-CnT'CO Cl NPs ti OI-C7) 1nrrCDrCOD)N�CNf�N�C70N-C) V` IIr T- TrCnNTr TiTrCC)NC")NNN�C' U)NN 05 C") C')Tr of N CON LOCATION DISTANCE1 0d' U)-U')U)'4)C) - CO U) 00 CAN O NO CC) CD 0000N CO O O O CO Cr) N 47 0- CD N- CD Tr CD U)'4) CA 00 CO CO U) CD U7W C.] Tr C') CL) W U) CV 0V 4) 4) CU (ON- 0 t') N- CV I'- CD (ON CV .03) CO N CO CD r N O C)CO r.: N.: NI CON 47 NCO O) N CC) o C'7rNMM 4) 0C)COCDCD0-0000C7)0) NNC*) N MMMCO. U)C7Mco_ co_ Mco_ co_ co_ MM � mo d' Ti N41 ,4 NI T T T T T T T r T T V- T r r T T . T T T T T T C- CROSS SECTION < COO MU -ILL CI - J2ZOCLd'C01> X FLOODWAY DATA re W W I I O U) V re O C, z O O J u_ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE23 T� 1% ANNUAL CHANCE FLOOD WATER SURFACE l ELEVATION (FEET NAVD88) INCREASE V Cr) N Tr N U) r U) sr U) ' t U) N mr mr mr U) U) mr mr Tr U) Mr OOOC7000d 0C7d C)C7OCJ C?6 C?606 6 C) WITH FLOODWAY Nt co O O) U) CD 0 yr U) O N- r...-yr O N U) U) M Yr 0D U) CO DO W)I�OCi r6r•-:,-NU)I•-:OCr)4ti6)N46)Cr)CDcd Tr U) U) UP l*". 0 0 0 0 0 0 N N N CI OD M yr CO Cp C9 Cp Cp CO CD P --ti f1* tin tr- ti r- t- r- ti N nr Tr Tr Tr Tr nr Nr nr Tr Tr Tr Tr Tr Tr Tr Tr nr nr WITHOUT FLOODWAY O U, N- U) CO - I— CA T- U) co N N U) CO r co CO co N r r Tr O)I-:04rO ON4I-:OM406N01Ci01CD csi O Tr U) I ! U) N- CO CA C) 0 C) 0 N N CV 01 0) 01 rt CD OD 00 00 00 0 CD N N Iti N N N N- I- N- N 0- N N- r- N 0- ni' C [t nt [t I' V''I Nr Tr Nt Nt V't't Tr REGULATORY O U) N- U) CO.— N- C) r U) 00 N N U) 00 r 0 00 O N r r V 6] I-; 00 4 r O ti O N 4 {` O M 4 CD 6) or cO 0i) M 6 rn 6 Nt006N-000)0000 NNNMC1coTr co CD C0 CD cD CD CD I tit, I~ N- N ti r- Ns r- ti r- r~ N- N ti FLOODWAY MEAN VELOCITY (FEET/SEC) Cr1 8"r 0 O v. co r N Cr) r r r O N CO N- U) CO U) CD 6) -`428" O)COr .O�C CNO)OO �OI-OO 4N666UJ6MC7MTi viC')Cr)MNC7 115 MCDCr)if) SECTION AREA (SQ. FEET) 0 ul C00 Or co N 00 C ul co CD 00 U) I- g3 N O CO CD CO M U? Tr 00 0O Nr I� r0 CD CO co N N N 00 N CD d C0 •- r 00 N CO U) O r- Tr r 0 0 OD N 7 C0 O) C4 O r r r r CO [Si CA T- OO U) cc CTi r T-0}) N T- ]= 1: W OLV LL OOOI-Mr 0)r -CO U) CO CDN NO cm Tr CDnr 00CAN N00000N-r0 rr0^7 U)r C) CD U)N P- U)N-O CPCOopT-coT- rNNChNNrrNCV- Or NrNCV- C')C7C7CA- Cr)rrr LOCATION DISTANCE' r I- N O) U) T- U) Tr N l0) C) 00 N CO O O CO O co Tr N T- CD 00 U) CO CD CD U) U) C)t7CO N h- CD 00 CD n- OIL i—CD rCnr 0, U) Tr 0D Tr co U) r N N CO.- V O) O 01 O N-. Tr O r O) U) Cr; OS O tr O CO O N V co- CO O r CO CO co- r N CD OO r N 4 M 00 V� Tr Tr v IT Tr v Tr� Tr CO Try co v�v 4Oi CD CD 4414 - - - - - - - - - - - - r r r r r r r r r r r r r r r r r r r r r r r CROSS SECTION aaOO0❑WLLOI- -I2Z0CI-UCCV]I-❑ FLOODING SOURCE: SOUTH PLATTE RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE M N v r r N M N N N M N N N N N r O O O O O O O O O O O O O O O O 0 0 0 0 WITH FLOODWAY OMNtiMrMNONNM V K)O) V OC)N CO 03 C3)NrCDU)0) 0010034 CO COMO) CO 47 W Ln N-NtiRNNNNNmN.COCr00 o0)CCCa030)CC ..... " 4 d' ... ,. 4--cf 4 ., WITHOUT FLOODWAY COO 4 CO CD M 00 I.f r GO CO O O) CO N 00 NCO In N 0) N r CO 4 CA CO N N 4 N CD M 0) CD 4 OO LCD Tr Tr Tt In CD CD N N CO 0) O) O r r N N CO Nr r Ln N N N N N N N N N N N co 00 O CO CO CO OD CO 00 T , T REGULATORY 03 CO ' CO CO M 00 N 117 00 O] O 0) r M N N co N CD U) N O) N r CO 4 O) OO N N w N co M CS! CD 4 C>o In Nr Nr Nr 1 f 7 CD CO N N CO O) 0) r r N N o Nr Tr 47 NN N N N N NN NN NC70c000000003C70O000 FLOODWAY MEAN VELOCITY (FEET/ SEC) O N N r M 0) O U) r M CD CD N CD N N CO 4 4 4 4 LCD 4 4 N N r N N M 4 N N N 4 SECTION AREA (SQ. FEET) V 11] N N L() N O N O 00 CO O C7) N 0) N N 00 N Cn O O Ca 1i J CD N r U7 N M m O r O M O) M CO C*) 0N'-10'-0'- C7J 0) CD Ln 0000 1n CDCOM M ODLC) 0000 N NCO 0)O)N _ .. r r ❑L W [Y]CA4OC740]NLl"irm60)wD *r6N V V rr V �CpCOCDC) 000rNCDOrr N0] 00 0N� rONM V 00000NMV rrNMNrNMNCOCDUjCDMCO7 LOCATION DISTANCE' O V NCi)CONNO)LOMNrNLl7LC) M0)M V F F-CMM CCL)W CCC)' U)0)N- Ww'UwCDD N C)0 Ndco CO NN OL400M000C") NC`)COO O O r r N N N C`7 07 Tr It Cr LOU) CD CO 42 N N CO 03L014) 03 L17 In 6 U) Ln 6_6_ 6_6_ U) 117 117 I U) U) 6 r r r r r r r r r r r r r ...... r CROSS SECTION Q Q Q¢ m m m m m m m m m m m m m m m FLOODWAY DATA w w a H O N 0 O 0) z_ 0 O O J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1Feet above confluence with Platte River FLOODWAY DATA FLOODING SOURCE: SOUTH PLATTE RIVER 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE rrNrmmOmCf)Cn V NONNCC) hNM 666666666666666666666 WITH FLOODWAY N r a r CO N M N M O �f J r CO CO r N- r M N r 4 10C)COrrNIt)-NN-It)CDr(000 Oro OtiN� tiOOCOOrrrNNmmm��Cf)� CO CO CO m CO w O C) 0) O) 0) C) CA 6) CA 0) m O) m 0) O 4444444444-4:444444444 WITHOUT FLOODWAY T- O00 C) CC) C3)COC CO If) CN-(0000) u, CV N -r Om R4O)CDOrNCn6NCOCC)CDOCDOO6CO Ch CDNtihCOO)OOOrrrNNMMM CC)CI) C) MMMOWMMMMMMMMMMMMM REGULATORY r000C17MmOCpCnO CpMO)ONNrOM 0iCDO CONC0Cf]C0OCn OC�)OrC'] CO N- N- N- CO0)OOOrrrNNmmm o CC CO CC M CO CO CA CA ) CA O ) O) M O O CA M M 0) 0) FLOODWAY MEAN VELOCITY (FEET/ SEC) O O M CA O lC) C) N N h CC7 CD i%) r O CD CC) Ct) M to COMOMlf}NrNmmmme NCCOrC COCCDCC7 SECTION AREA (SQ. FEET) Mra)rte,-mN-COCO LI)C' CO o4NN�ooC CONNNNNrrNrMO CDNOtiN- 0)0)M NCt7~ CC)CD0)N-mtiCr67r,C+]N-) CO CO CD C C) r CA CO CC) Cn U) CIi CD CC) r m N u) C1) FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS m ~ W ❑ W W NC N-COCN�C7)CCCO CC'')CO-C.00AOCprC NM rU)N)Olt)u)COCCONMOMQM rmC7)CO V OCOCDCfSMW N�IJO V LCD') *r mmrrrN mM Nrr LOCATION DISTANCE1 r vo,NmNM00NNNNMn000 ONrmC)CDN hN-CDN-mOrComO V V V CAO�OONCO)CACA0)ON000C)MN C1) 0) N Cl) C) C�? 0o C) C'7 CO N- - Cf) ti N CO c C') CC) N - OD OCCCDC]IOCODCODCODCDCDCDC COCNDCNOCCDCCC OCCOCOCDcC9CC0 r r r r r r r r ...... r ...... CROSS SECTION Q-CJW > X N< O❑WU-OI--) m m m m m m m m m m m O O O O O O O O L% U TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE m m m O O 0 O WITH FLOODWAY NI CO LP LD 1.0 II O r -I CO CD WITHOUT FLOODWAY C.' m 44- CD N N cA CO O M TtLdo.-i N N LID LID o Q H m m LD LO REGULATORY o m M LD LD n FLOODWAY MEAN VELOCITY FEET/ SEC) I� N.. 07 N z'L!1 N rl SECTION AREA (SQ. FEET) 1--1 00 LD (-.1' O 1*-. Lfj rl 01 CO M CO 01 CO LD Ql WIDTH (FEET) rcl CO M Tt N N r-1 r..1- LOCATION DISTANCE' o IN• al CO d- vi LLn H .1' g -I00 1-" • • f11 Ln CROSS SECTION Q m U ❑ a) > f0 a 5 0 In a) U a a) U- 0 0 O t4 N a) U- FLOODWAY DATA 2 U w oc oC w oc W H H a F- 0 N pc 0 N 0 z 0 0 J LL G) z Q H z W CD a z a 2 >- z w W 2 W W W W WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 'Feet above confluence with South Platte River FLOODWAY DATA FLOODING SOURCE: SOUTH PLATTE RIVER SPILL 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE N O o o WITH FLOODWAY N (D co o N M CD (D 1 WITHOUT FLOODWAY O CD co O 0,1 CO CD CD . V REGULATORY O CD (D O N CO (D (D FLOODWAY MEAN VELOCITY (FEET/ SEC) Ch r O a SECTION AREA (SQ. FEET) M M N O FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS I- W W LL LO N t-- T LOCATION W 0 Qo,- ( CO L Q T T CROSS SECTION < co TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE U7M.r Q 0 0 WITH FLOODWAY CO I'. cl. CO O 0J co nt O c a Uj U) 47 WITHOUT FLOODWAY co CA N CO co CO co co Tr O O O U) U) U? REGULATORY Cr) C) CV cDo,C 00 V. 0 I.0 U) U) FLOODWAY MEAN VELOCITY (FEET/ SEC) N ti C•) C+) U) SECTION AREA (SQ. FEET) O) U] CO C7) U] CO LO U) CA I- 0 W S L S , �'NN O ') LOCATION DISTANCE' c Nr CO o co U7 C'7 CD CROSS SECTION <C0O CO CO C 0 U v 5 O co LL. FLOODWAY DATA W W ce v z a N LLl C, cc O z_ 0 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1Feet above Weld County Road 88 2Feet above Weld County Road 98 FLOODWAY DATA FLOODING SOURCE: SPRING CREEK TRIBUTARY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE N O O 0D CD O O O O O O O 0 a O O O r O O r O O O O r r O WITH FLOODWAY N N co. co in co Nr U) CD O OD C3) N- 6 N0CD1�tiNsNsCOOCODCODCODOCDo O O O r r r r r r r r r r r N U) U) LC) LC) LC) Lt7 U) LC) Lf) LC) LC) Lf) U) Lt) LL) WITHOUT FLOODWAY NCON OOL0CDc'IX) CDCD0OCD Or iri N CO co ti N co N co CO co CO co C) O OOC).- - r r-rrr-r.N U) U) U) U) U) L() U) L() U7 U) U) U) U) U) LI) REGULATORY N 03 N C O LC) CD Nr LC) CA CO CO CD f- .-NMCOI Ni:� h CCOOOOOCODOLci OD OD Ccci D O O O O r r r r r r ..... N U) U) U) U) UC) U) U) LC) U) Lf) LC) LC) L() L() L{) FLOODWAY MEAN VELOCITY (FEET/ SEC) vrMCDOOO0)NtCD in co.O VD CO N N 60 CD O) b CD CO CO r C O OC) 00 SECTION AREA (SQ. FEET) CP inCOD Lt) A- CO d) - O) CO LC) O O - O CO CD Cr) ODCD Tr Tr1 r - OD 1FCD lONA' � NN'NA- NN I'O)rr r FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS - p- H fj L!) NCOCD - N LC) I-0OOI-.OO Lo 0O0)LnM U7rC7rOCDC0 LO CD N r 07 {s � r r NN r r M1 LC) LOCATION DISTANCE1 O OO OOOOOOOOO )O co_ C O0 CCO CO's)C MN -NN N- COCO Ch Lt') . r .- N N N CO C'7 CO U7 CROSS SECTION QmU❑Wu_U' 2-- J2ZO TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE 1.0 0.8 0.9 0.8 0.8 1.0 1.0 1.0 1.0 1.0 0.7 1.0 0.6 0.3 WITH FLOODWAY cr(DNNCDrstO) WOCdO)(OCrJ N-:o44NCAN4CD00oorN op op op op co 0O OO O3 c0 c0 03. OD OD OD vTr-vvTr- Tl:v vTr- vNI: vNI: WITHOUT FLOODWAY Nr CO O") Nr O r Tr. 0) CO O O) 0) 0 0 CD O) Ch4GOrCiL.6NN cci GirCV 030000ODOD00OD000C00cc00C .4:vTI: 'I: 'I: 'I: 'I: NI: NI: TI: vTI: ,4: REGULATORY 4oprp40rTr. 000000700 co ti C*) Cr) 4 co r Cr) Ln N- CO 0) A— N CO CD h- M1 N N` CO CA OO 0O co 0O 0 0 OO 00 OD 00 CU 00 CO CO CO C0 00 00 CO 0O 4. . tl'TTTi FLOODWAY MEAN VELOCITY (FEET/ SEC) 07 LL) o Lo 0 in N .4 Ln co La r co co A— C*)ci r ri4 4r).44C4M SECTION AREA (SQ. FEET) rNO rO1rO1N-aNrU)N,Tt r O1 I., TrU)00 Cr10) 0N -F —NC) -CDNrLnNru)Nr0 NrLC)NrCD p I— W ❑ SLI - � 0000 COUlUlU)N CDU')00)Cr) LCOCor4L rs"DCrONTr ')r NI)N�0)04 LOCATION ELI 4( co 0000000000000 O C`o ce) CO r- 0 co ca c0 co co N N CI rCDrCDNf� r rNCrLc s n LnCOCONcci 0C) CROSS SECTION <COO LL]L- 23Y-J 2 Z C4 2 CD C Cll CV l6 2 V' 03 0 u_ 0 A- 0 a.$ u_ FLOODWAY DATA FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 1Feet above County Road 18 (Grant Avenue) 2No floodway calculated FLOODWAY DATA FLOODING SOURCE: TRI-AREA DRAINAGEWAY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE CO co T- N CJ) N O Tr CD C) CD CD CD CD CD CD C_7 0 6 6 0 6 ci O O Ca O C7 6 C7 C7 6 WITH FLOODWAY COTr Tr.Ttoco6Ttu)01NNNI`NC` N LC) I-- 6 C) CD co N Ti O 6 I` 6 CD 00 u) 03 u) u) CD CD CO N- ti 00 0D 00 CD Q) O) C) CD 0) CD C3) Q) co O) co co co 0) 6! 0) CA CD O WITHOUT FLOODWAY CD C)NT-Tr CID O6TrNNNf-NI- r6NN-CCjNCDOCJN QiCDf:LnCD00 LC) Ci) L() LC) CO CO CD N- F— N- 00 CO C) CD CD CD CD CD CD CD COCD CD 0) 0) 0)CDO)C0)0)CD REGULATORY 00 N CO N r vr CO CJ LC) sT N N N N- N N U) F— OD N CD CO N Tr CA CD N- LC) CD OD r 0 0!) LO U) CO CO CD N- N- N- 00 00 0) OJ C7) CD cn co co CJ) co CA 0)0)0)0)0)0)0) CA CD a FLOODWAY MEAN VELOCITY (FEET/ SEC) CD OQCDL(7CDCOI-I`C•TrCAOTrTrQD CD ni N C) Cr) C C (b 0D C" 7 M LO U) Ti U) SECTION AREA (SQ. FEET) C))ND)N 6NMl!?f7O LnlTrrCD CD Cy) a) u) O1 Tr CJ co 0) M a) CO Tr N C7 CD CD01CVNNr FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS = H H W O W LL N, 0001 T. N U),:r c, OOC)00 C7NN CD Ngt Tr C1C+7C')C) rrN-CD0DN-N-LC) LOCATION DISTANCE' CCl N N C D) U) D N CO O1 C D N CD C CD D O O u) ,r Tr CD C D T- N nr T- CD C) CO 03 0D °D 00 T. CA co C D 00 r LC) C) OD CD C D 00 O 03 O 47 rN— NNe u)Lo- CD(.Df�r- co" Cia00 CROSS SECTION ¢C?=--) —I zOci_CSccnI—D> TABLE 23 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) INCREASE 00 OO WITH FLOODWAY N O) co uo uo coco REGULATORY WITHOUT FLOODWAY N O] LO CD 00 LD CO v N C) 47 CO CO LO CO CO Ti FLOODWAY MEAN VELOCITY (FEET/ SEC) tiCO N M SECTION AREA (SQ. FEET) aCD IC) N r r I p Lii 0 i I--- L .-- 0) o LOCATION DISTANCE' r N CROSS SECTION Q CO FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS TABLE 23 'Feet above confluence with South Platte River 2Cross Section Located within Town of Windsor Corporated Limits FLOODWAY DATA FLOODING SOURCE: WCR 17 -SH257 DIVIDED FLOW 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION ( FEET NAVD88) u Cl) Lu / z nLo @�ow ddoo66 WITH FLOODWAY roNc__ 4eaaaa coL3coco4147 N w w w w w ++++++ WITHOUT FLOODWAY •Ch4747nm� 44w6cc cou1conuln wr- r- »�r- +�+++� REGULATORY fulul00n# #.4acokco U)41cococou..) w w w P- P- I,- V-- d.- 1.- cr- nP- •4- FLOODWAY MEAN VELOCITY (FEET/ SEC) nnq@RO. ww2___ SECTION AREA (SQ. FEET) CO � '4 03 - C)'t FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS �� LL k\k\7\ l' LOCATION DISTANCE' ooulo47» $q&3Q? CON -co -6 amgnnn CROSS SECTION < al OOwb TABLE 23 Non -encroachment areas may be delineated where it is not possible to delineate floodways because specific channel profiles with bridge and culvert geometry were not developed. Any non -encroachment determinations for this Flood Risk Project have been tabulated for selected cross sections and are shown in Table . The non -encroachment width indicates the measured distance left and right (looking downstream) from the mapped center of the stream to the non -encroachment boundary based on a surcharge of 1.0 foot or less. Table 24: Flood Hazard and Non -Encroachment Data for Selected Streams [Not Applicable to this Flood Risk Project] 6.4 Coastal Flood Hazard Mapping This section is not applicable to this Flood Risk Project. . Table 25: Summary of Coastal Transect Mapping Considerations [Not Applicable to this Flood Risk Project] 6.5 FIRM Revisions This FIS Report and the FIRM are based on the most up-to-date information available to FEMA at the time of its publication; however, flood hazard conditions change over time. Communities or private parties may request flood map revisions at any time. Certain types of requests require submission of supporting data. FEMA may also initiate a revision. Revisions may take several forms, including Letters of Map Amendment (LOMAs), Letters of Map Revision Based on Fill (LOMR-Fs), Letters of Map Revision (LOMAs) (referred to collectively as Letters of Map Change (LOMCs)), Physical Map Revisions (PMRs), and FEMA-contracted restudies. These types of revisions are further described below. Some of these types of revisions do not result in the republishing of the F1S Report. To assure that any user is aware of all revisions, it is advisable to contact the community repository of flood -hazard data (shown in Table 30, "Map Repositories"). 6.5.1 Letters of Map Amendment A LOMA is an official revision by letter to an effective NFIP map. A LOMA results from an administrative process that involves the review of scientific or technical data submitted by the owner or lessee of property who believes the property has incorrectly been included in a designated SFHA. A LOMA amends the currently effective FEMA map and establishes that a specific property is not located in a SFHA. To obtain an application for a LOMA, visit www ferna_goviletter-map-amencdment-lama and download the form "MT -1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill". Visit the "Flood Map -Related Fees" section to determine the cost, if any, of applying for a LOMA. FEMA offers a tutorial on how to apply for a LOMA. The LOMA Tutorial Series can be accessed at www.fema.ciovlonline-tutorials. For more information about how to apply for a LOMA, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627). 120 6.5.2 Letters of Map Revision Based on Fill A LOMR-F is an official revision by letter to an effective NFIP map. A LOMR-F states FEMA's determination concerning whether a structure or parcel has been elevated on fill above the base flood elevation and is, therefore, excluded from the SFHA. Information about obtaining an application for a LOMR-F can be obtained in the same manner as that for a LOMA, by visiting www.fema cicviletter-map-amendment-loma for the "MT -1 Application Forms and Instructions for Conditional and Final Letters of Map Amendment and Letters of Map Revision Based on Fill" or by calling the FEMA Map Information eXchange, toll free, at 1-877-FEMA MAP (1-877-336-2627). Fees for applying for a LOMR-F, if any, are listed in the "Flood Map -Related Fees" section. A tutorial for LOMR-F is available at www.fema 9ov/online-tutorials. 6.5.3 Letters of Map Revision A LOMR is an official revision to the currently effective FEMA map. It is used to change flood zones, floodplain and floodway delineations, flood elevations and planimetric features. All requests for LOMRs should be made to FEMA through the chief executive officer of the community, since it is the community that must adopt any changes and revisions to the map. If the request for a LOMR is not submitted through the chief executive officer of the community, evidence must be submitted that the community has been notified of the request. To obtain an application for a LOMR, visit www fema.covimecia-librarviassets/ documents/1343 and download the form "MT -2 Application Forms and Instructions for Conditional Letters of Map Revision and Letters of Map Revision". Visit the "Flood Map - Related Fees" section to determine the cost of applying for a LOMR. For more information about how to apply for a LOMR, call the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627) to speak to a Map Specialist. Previously issued mappable LOMCs (including LOMRs) that have been incorporated into the Weld County FIRM are listed in Table 26. Please note that this table only includes LOMCs that have been issued on the FIRM panels updated by this map revision. For all other areas within this county, users should be aware that revisions to the FIS Report made by prior LOMRs may not be reflected herein and users will need to continue to use the previously issued LOMRs to obtain the most current data. Please note that this table only includes LOMCs that have been issued on the FIRM panels updated by this map revision. For all other areas within this county, users should be aware that revisions to the FIS Report made by prior LOMRs may not be reflected herein and users will need to continue to use the previously issued LOMRs to obtain the most current data. Table 26: Incorporated Letters of Map Changes Case Number Effective Date Flooding Source FIRM Panel(s) 15-08-0573P2 7/14/2016 Eaton Draw 08123C1529F, 08123C1533F, 08123C1535E 121 Table 26: Incorporated Letters of Map Changes Case Number Effective Date Flooding Source FIRM Panel(s) 16-08-0665P1 06/20/2017 Cache La Poudre River 08123C1561F, 08123C1542F 17-08-1017X' 12/22/2017 Cache La Poudre River 08123C1561F 17-08-1256P 7/26/2018 South Platte River 08123C2115F 18-08-1233P3 10/28/2019 Rocky Mountain Creek 08123C1890F, 08123C2077E 19-08-1058P 02/01/2021 Little Thompson River, Little Thompson River— SH60 Split, Little Thompson River — Railroad Split 08123C1703F 21-08-0099P 8/30/2021 John Law Ditch, John Law Ditch — FRE East Flow Path, John Law Ditch — GWD Flow Path, John Law Ditch — WCR 23 Flow Path, John Law Ditch — WCR 23 Lower Flow Path, John Law Ditch — Whitney Flow Path 08123C1484F, 0$123C1503F, 0812301504E LOMR was incorporated into hydraulic modeling. Due to changes in the South Platte River modeling the profile and mapping of the LOMR were adjusted to reflect the new conditions. 2 Although a portion of LOMR 15-08-0573P falls within the scope of this map revision, panel 08123C1535E was not revised. Therefore, users must continue to refer to the annotated FIRM attached for this LOMR for FIRM panel 08123C1535E 3 Although a portion of LOMR 18-08-1233P falls within the scope of this map revision, panel 08123C2077E was not revised. Therefore, users must continue to refer to the annotated FIRM attached for this LOMR for FIRM panel 08123C2077E 6.5.4 Physical Map Revisions A Physical Map Revisions (PMR) is an official republication of a community's NFIP map to effect changes to base flood elevations, floodplain boundary delineations, regulatory floodways and planimetric features. These changes typically occur as a result of structural works or improvements, annexations resulting in additional flood hazard areas or correction to base flood elevations or SFHAs. The community's chief executive officer must submit scientific and technical data to FEMA to support the request for a PMR. The data will be analyzed and the map will be revised if warranted. The community is provided with copies of the revised information and is afforded a review period. When the base flood elevations are changed, a 90 -day appeal period is provided. A 6 -month adoption period for formal approval of the revised map(s) is also provided. For more information about the PMR process, please visit ymfw.kma.clov and visit the "Flood Map Revision Processes" section. 6.5.5 Contracted Restudies The NFIP provides for a periodic review and restudy of flood hazards within a given community. FEMA accomplishes this through a national watershed -based mapping needs assessment strategy, known as the Coordinated Needs Management Strategy (CNMS). The CNMS is used by FEMA to assign priorities and allocate funding for new flood hazard analyses used to update the FIS Report and FIRM. The goal of CNMS is to define the validity of the engineering study data within a mapped inventory. The CNMS 122 is used to track the assessment process, document engineering gaps and their resolution, and aid in prioritization for using flood risk as a key factor for areas identified for flood map updates. Visit www.fema.gov to learn more about the CNMS or contact the FEMA Regional Office listed in Section 8 of this FIS Report. 6.5.6 Community Map History The current FIRM presents flooding information for the entire geographic area of Weld County. Previously, separate FIRMs, Flood Hazard Boundary Maps (FHBMs) and/or Flood Boundary and Floodway Maps (FBFMs) may have been prepared for the incorporated communities and the unincorporated areas in the county that had identified SFHAs. Current and historical data relating to the maps prepared for the project area are presented in Table 27, "Community Map History." A description of each of the column headings and the source of the date is also listed below. • Community Name includes communities falling within the geographic area shown on the FIRM, including those that fall on the boundary line, nonparticipating communities, and communities with maps that have been rescinded. Communities with No Special Flood Hazards are indicated by a footnote. If all maps (FHBM, FBFM, and FIRM) were rescinded for a community, it is not listed in this table unless SFHAs have been identified in this community. • Initial Identification Date (First NFIP Map Published) is the date of the first NFIP map that identified flood hazards in the community. If the FHBM has been converted to a FIRM, the initial FHBM date is shown. If the community has never been mapped, the upcoming effective date or "pending" (for Preliminary FIS Reports) is shown. If the community is listed in Table 27 but not identified on the map, the community is treated as if it were unmapped. • Initial FHBM Effective Date is the effective date of the first FHBM. This date may be the same date as the Initial NFIP Map Date. • FHBM Revision Date(s) is the date(s) that the FHBM was revised, if applicable. • Initial FIRM Effective Date is the date of the first effective FIRM for the community. • FIRM Revision Date(s) is the date(s) the FIRM was revised, if applicable. This is the revised date that is shown on the FIRM panel, if applicable. As countywide studies are completed or revised, each community listed should have its FIRM dates updated accordingly to reflect the date of the countywide study. Once the FIRMs exist in countywide format, as PMRs of FIRM panels within the county are completed, the FIRM Revision Dates in the table for each community affected by the PMR are updated with the date of the PMR, even if the PMR did not revise all the panels within that community. The initial effective date for the Weld County FIRMs in countywide format was 1/20/2016. 123 Table 27: Community Map History Community Name Initial Initial FHBM Identification Effective Date Date FHBM Initial FIRM FIRM Revision Effective Revision Date(s) Date Date(s) Ault, Town of 1/20/2016 N/A N/A 1/20/2016 N/A Dacono, City of 9/5/1975 9/5/1975 N/A 7/16/1979 1/20/2016 Eaton, Town of 5/10/1974 5/10/1974 2/27/1976 9/4/1979 6/4/1980 1/20/2016 Evans, City of 4/5/1974 4/5/1974 1/16/1976 4/2/1979 1/20/2016 TBD Firestone, Town of 9/19/1975 9/19/1975 Fort Lupton, City of 11/22/1977 12/18/1979 1/20/2016 TBD 5/31/1974 5/31/1974 6/11/1976 4/2/1979 1/20/2016 TBD Frederick, Town of 9/26/1975 9/26/1975 N/A 7/16/1979 1/20/2016 7/13/1982 TBD Garden City, Town of1'2 1/20/2016 N/A N/A 1/20/2016 TBD Gilcrest, Town oft 1/20/2016 N/A N/A 1/20/2016 TBD Greeley, City of 5/3/1974 5/3/1974 Grover, Town of2 2/28/1975 7/16/1979 1/20/2016 TBD N/A N/A Hudson, Town of3 3/21/1978 3/21/1978 N/A N/A N/A Keenesburg, Town of3 3/21/1978 3/21/1978 N/A 3/18/1980 1/20/2016 9/22/1999 9/27/1991 9/28/1990 9/28/1982 N/A 3/18/1980 1/20/2016 9/22/1999 9/27/1991 9/28/1990 9/28/1982 Kersey, Town of 1/20/2016 N/A N/A 1/20/2016 TBD LaSalle, Town of 5/28/1976 5/28/1976 N/A 1/20/2016 TBD Lochbuie, Town of2 N/A N/A N/A N/A N/A Longmont, City of 10/26/1973 10/26/1973 N/A Mead, Town of 1/20/2016 N/A N/A 07/05/1977 1/20/2016 TBD 12/18/2012 06/02/1995 09/18/1987 08/01/1983 TBD 124 Table 27: Community Map History Community Name Initial Identification Date Initial FHBM Effective Date FHBM Revision Date(s) T Initial FIRM Effective Date FIRM Revision Date(s) Milliken, Town of 5/17/1974 5/17/1974 3/12/1976 8/1/1979 1/20/2016 TBD Nunn, Town of 8/30/1974 8/30/1974 12/12/1975 2/1/1979 1/20/2016 Pierce, Town of 11/29/1974 11/29/1974 3/26/1976 11/15/1979 1/20/2016 Platteville, Town of 1/20/2016 N/A N/A 1/20/2016 TBD Raymer, Town of2 N/A N/A N/A N/A N/A Severance, Town of 9/22/1999 N/A N/A 9/22/1999 1/20/2016 Weld County, Unincorporated Areas 3/21/1978 3/21/1978 N/A 3/18/1980 1/20/2016 9/22/1999 9/27/1991 9/28/1990 9/28/1982 TBD Windsor, Town of 9/27/1991 9/27/1991 N/A 9/27/1991 1/20/2016 TBD 1This community did not have a FIRM prior to the first countywide FIRM for Weld County 2No Special Flood Hazard Areas Identified 3Dates for this community were taken from Weld County, Unincorporated Areas SECTION 7.0 — CONTRACTED STUDIES AND COMMUNITY COORDINATION 7.1 Contracted Studies Table 28 provides a summary of the contracted studies, by flooding source, that are included in this FIS Report. Table 28: Summary of Contracted Studies Included in this FIS Report I Flooding Source FIS Report Dated Contractor Number Work Completed Date Affected Communities Cache La Poudre TBD AECOM 2016 -Kersey, 1452 1/18/2018 Greeley, City of; Town of; Windsor, Town of; Weld County, Unincorporated Areas 125 FIS Report I Work Completed Flooding Source Dated Contractor Number Date Affected Communities Evans, City of; Firestone, Town of; Frederick, Town of; St. Vrain Creek and 2016_ Longmont, City of; Tributaries TBD AECOM 1452 1/18/2018 Mead, Town of; Milliken, Town of; Platteville, Town of; Weld County, Unincorporated Areas Evans, City of; Fort Lupton, City of; Greeley, City of; Kersey, Town of; South Platte River and TBD AECOM 2016- 1/18/2018 LaSalle, Town of; Tributaries 1452 Milliken, Town of; Platteville, Town of; Weld County, Unincorporated Areas Evans, City of; Firestone, Town of; Frederick, Town of; Big Thompson River and 2016- Mead, Town of; Tributaries TBD AECOM 2/28/2017 1452 Milliken, Town of; Platteville, Town of; Weld County, Unincorporated Areas Dacono, City of; Eaton, Town of; Evans, City of; Firestone, Town of; All Significant Flooding 3/1974; Frederick, Town of; Sources in Weld County, Gingery H-4017 10/1977; Fort Lupton, City of; Town of Eaton, Town of 1/20/2016 Associates, Inc. 12/1977; Greeley, City of; Pierce 3/1978 Milliken, Town of; Nunn, Town of; Pierce, Town of; Weld County, Unincorporated Areas US Department of EMW-87- Weld County, Coal Creek Interior Bureau of Reclamation E-2551 8/1/1988 Unincorporated Areas All Significant Flooding Sources in Weld County & Town of Eaton 1/20/2016 Simons, Li S Associates, Inc. Eaton, Town of; Weld EMW-86- 7/1/1990 County, Unincorporated C-2262 Areas Flooding Sources in Town of Severance 1999 USACE, Omaha District EMW-95 11/1997 Severance, Town of E-4759 Big Thompson River , 2/1978 USACE, Omaha District 2/1978 Weld County, Unincorporated Areas 126 7.2 Community Meetings The dates of the community meetings held for this Flood Risk Project and previous Flood Risk Projects are shown in Table 29. These meetings may have previously been referred to by a variety of names (Community Coordination Officer (CCO), Scoping, Discovery, etc.), but all meetings represent opportunities for FEMA, community officials, study contractors, and other invited guests to discuss the planning for and results of the project. 127 Table 29: Community Meetings Attended By FEMA, the community, the study contractor, Colorado Department of Transportation (CDOT), and the Department of Natural Resources (DNR). TBD FEMA, the community, the study contractor, Colorado Department of Transportation (CDOT), and the Department of Natural Resources (DNR). TBD FEMA, the community, the study contractor, Colorado Department of Transportation (CDOT), and the Department of Natural Resources (DNR). FEMA, County of Weld, City of Longmont, Town of Johnstown, AECOM TBD FEMA, the community, the study contractor, Colorado Department of Transportation (COOT), and the Department of Natural Resources (DNR). TBD TBD FEMA, the community, the study contractor, Colorado Department of Transportation (CDOT), and the Department of Natural Resources (DNR). TBD FEMA, the community, the study contractor, Colorado Department of Transportation (CDOT), and the Department of Natural Resources (DNR). TBD FEMA, the community, the study contractor, AECOM, Colorado Water Consercation Board (CWCB) Date of Meeting Meeting Type 12/7/2017 FRR Meeting CC0 Meeting FRR Meeting CC0 Meeting FRR Meeting FRR Meeting CCO Meeting FRR Meeting CCO Meeting CCO Meeting FRR Meeting CCO Meeting FRR Meeting CCO Meeting Scoping 8/8/8888 12/7/2017 818/8888 12/7/2017 4/24/2017 8/8/8888 12/7/2017 p818888 8/8/8888 12/7/2017 8/8/8888 12/7/2017 /8/8888 /9/2015 FIS Report Dated 8/8/8888 \ @ m co $ \ @ 0 \ @ co - = co a co a » ity » 0 a § > % % t _ 2 % co r -o § > 6 2 O \ H ° e a .- c b ? / - k . EL 0 o t $ d co d a 7 2 o 0 j � d E \/ SECTION 8.0 — ADDITIONAL INFORMATION Information concerning the pertinent data used in the preparation of this FIS Report can be obtained by submitting an order with any required payment to the FEMA Engineering Library. For more information on this process, see www.fema,gov. The additional data that was used for this project includes the FIS Report and FIRM that were previously prepared for Weld County, (FEMA 2006). Table is a list of the locations where FIRMs for Weld County can be viewed. Please note that the maps at these locations are for reference only and are not for distribution. Also, please note that only the maps for the community listed in the table are available at that particular repository. A user may need to visit another repository to view maps from an adjacent community. Table 30: Map Repositories Community Address City State Zip Code Ault, Town of Town Hall 201 1st Street Ault CO 80610 Dacono, City of City Hall 512 Cherry Avenue Dacono CO 80514 Eaton, Town of Town Hall 223 1st Street Eaton CO 80615 Evans, City of City Hall 1100 37th Street Evans CO 80620 Firestone, Town of Town Hall 9950 Park Avenue Firestone CO 80504 Fort Lupton, City of City Hall 130 South McKinley Avenue Fort Lupton CO 80621 Frederick, Town of Town Hall 401 Locust Street Frederick CO 80530 Garden City, Town of Town Hall 621 27th Street Road Garden City CO 80631 Gilcrest, Town of Town Hall 304 8th Street Gilcrest CO 80623 Greeley, City of City Hall 1000 10th Street Greeley CO 80631 Grover, Town oft Town Hall 315 Chatoga Avenue Grover CO 80729 Hudson, Town of Town Hall 50 South Beech Street Hudson CO 80642 Keenesburg, Town of Town Hall 91 W Broadway Avenue Keenesburg CO 80643 Kersey, Town of Town Hall 446 1st Street Kersey CO 80644 129 Table 30: Map Repositories ; Community Address I City State Zip Code ' LaSalle, Town of Town Hall 128 North 2nd Street LaSalle CO 80645 Lochbuie, Town of Town Hall 703 Weld County Road 37 Lochbuie CO 80603 Longmont, City of Development Services Center 385 Kimbark Street Longmont CO 80501 Mead, Town of Town Hall 441 Third Street Mead CO 80542 Milliken, Town of Town Hall 1101 Broad Street Milliken CO 80543 Nunn, Town of Town Hall 185 Lincoln Avenue Nunn CO 80648 Pierce, Town of Town Hall 144 Main Avenue Pierce CO 80650 Platteville, Town of Town Hall 400 Grand Avenue Platteville CO CO 80651 80742 Raymer, Town of Town Hall 226 Baird Street Raymer Severance, Town of Town Hall 3 South Timber Ridge Parkway Severance CO 80550 Weld County, Unincorporated Areas County Commissioner's Office 1150 O Street Greeley CO 80632 Windsor, Town of Town Hall 301 Walnut Street Windsor CO 80550 1 No Special Flood Hazard Areas Identified The National Flood Hazard Layer (NFHL) dataset is a compilation of effective FIRM Databases and LOMCs. Together they create a GIS data layer for a State or Territory. The NFHL is updated as studies become effective and extracts are made available to the public monthly. NFHL data can be viewed or ordered from the website shown in Table 31. Table 31 contains useful contact information regarding the FIS Report, the FIRM, and other relevant flood hazard and GIS data. In addition, information about the State NFIP Coordinator and GIS Coordinator is shown in this table. At the request of FEMA, each Governor has designated an agency of State or territorial government to coordinate that State's or territory's NFIP activities. These agencies often assist communities in developing and adopting necessary floodplain management measures. State GIS Coordinators are knowledgeable about the availability and location of State and local GIS data in their state. 130 Table 31: Additional Information FEMA and the NFIP FEMA and FEMA Engineering Library website www Tema c avinational-fiood-insurance• program-fiood- hazard-niappingientginea.ring-library NFIP website www fema.govinational-flood-inurance-program NFHL Dataset m5c ferna.ciov FEMA Region VIII Denver Federal Center, Building 710 P O Box 25267 Denver, CO 80255-0267 (303) 235-4812 Other Federal Agencies USGS website wwW.LISQs.cloy Hydraulic Engineering Center website www_hec usace arrny.rnil State Agencies and Organizations State NFIP Coordinator Doug Mahan, CFM CWCB Community Assistance Program Coordinator 1313 Sherman Street, Rm. 718 Denver, CO 80203 (303) 866-3441 x3221 douc ireahan ct,state.co us State GIS Coordinator Jon Gottsegen Statewide GIS Coordinator 601 E. 18'" Ave Denver, CO 80203 Phone: (303) 764-7712 ion ,pottsegen[ state CO. US SECTION 9.0 - BIBLIOGRAPHY AND REFERENCES Table 32 includes sources used in the preparation of and cited in this FIS Report as well as additional studies that have been conducted in the study area. 131 t M 1/12/2018 4/1/2019 2/16/1994 2/9/2015 December 1968 Publication Date/ Date of Issuance 1/23/2017 2/28/2017 7 co "4 co \CO , E Place of Publication Washington, D.C. Greenwood Village, CO Denver, CO Greenwood Village, CO Washington, D.C. T E 2 O R 6 O 0 q ,- 2 o « § G 0 Washington, D.C. Washington, D.C. Author/Editor m AECOM co 0 q k FEMA k u 7 \ c 8 co / \ w q ) 0 co Publication Title, "Article" Volume, Number, etc. Public Land Survey System Hydraulic Analysis for Select Streams in the CHAMP Study Area (St Vrain Y1; Hydrology, Hydraulics, and Floodplain Mapping submittal for Gilpin County Redelineation Flood Insurance Study, City of Black Hawk Flood Insurance Study, City of Central City Municipal Boundaries in Gilpin County Computer Program, HEC-2 Wafer -Surface Profiles TIGER/Line Shapefile, 2016 Light Defection and Ranging data(LiDAR) Publisher/ Issuer Bureau of Land Management Colorado Water Conservation Board Colorado Water Conservation Board Colorado Water Conservation Board Federal Emergency Management Agency �•a) 2k/\. ° b = /II¢ = O 2 7 B f.�$ I0. �/ U.S. Census Bureau U.S. Department of Interior, Geological Survey Citation in this FIS BLM 2017 CWCB 2017 CWCB 2018 CWCB 2019 FEMA 1984 r N i CV ' O \ w / | ? USCB 2016 USGS 2013 \ Y G_ Publication Date/ Date of Issuance O r O N r r r N- r N 4 o) r December 1978 February 1980 Place of Publication Reston, VA Reston, VA Fort Collins, Colorado Author/Editor U) Co O U7 CO O / CO M and I Consulting Engineers Publication Title, 'Article," Volume, Number, etc. USGS Digital Orthophoto Quarter Quadrangles National Hydrography Dataset (NHD) Topographic Mapping Aerial Photogrammetric Maps for Sheep Draw Flood Plain Study Topographic Maps. Coal Creek, Boulder and Weld Counties, Colorado Publisher/ Issuer U.S. Geologic Survey U.S. Geologic Survey Weld County, Colorado Weld County and Colorado Water Conservation Board Water Resources Consultants, Inc. Citation in this FIS i USGS 2016 USGS 2017 Weld 1975 Weld 1978 Water 1980 ELEVATION IN FEET (NAVD) 4700 4695 4690 4685 4680 4675 4670 4665 .... { U, > _. • L6 Q•.. 0 D IL I I .:1 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 STREAM DISTANCE IN FEET ABOVE MOUTH • LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 2,800 3,000 3,200 4700 4695 4690 4685 4680 4675 4670 3,400 FLOOD PROFILES ASHCROFT DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREA 01P ELEVATION IN FEET (NAVD) 4720 4715 4710 4705 4700 4695 4690 • I r r - •r� ~ . . r _y _ter. • - - r� - ... . . . . . •- - . I . ;�. L 1: LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4720 4715 4710 4705 4700 4695 4690 3,400 3,600 3,800 4,000 4,200 4,400 4,600 4,800 5,000 5,200 5,400 5,600 5,800 6,000 STREAM DISTANCE IN FEET ABOVE MOUTH FLOOD PROFILES ASHCROFT DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 02P ELEVATION IN FEET (NAVD) 4750 4745 4740 4735 4730 4725 4720 4715 . 4710 _ 4705 6,000 6,200 6,400 6,600 6,800 7,000 7,200 7,400 STREAM DISTANCE IN FEET ABOVE MOUTH 7,600 7,800 „7><. i f / .- . r f : . .., d _ •Il 8,000 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD ' AY"\` ti STREAM BED 8,200 CROSS SECTION LOCATION 8,400 4750 4745 4740 4735 4730 4725 4720 4715 8,600 FLOOD PROFILES ASHCROFT DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 03P ELEVATION IN FEET (NAVD) 4765 4760 4755 4750 4745 4740 _ I Y f • LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD MOW/WA STREAM BED CROSS SECTION LOCATION 4765 4760 4755 4750 4745 4740 8,600 8,80❑ 9,000 9,200 9,400 9,600 9,800 10,000 10,200 10,400 10,600 10,800 11,000 11,200 STREAM DISTANCE IN FEET ABOVE MOUTH FLOOD PROFILES ASHCROFT DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 04P ELEVATION IN FEET (NAVD) 4785 4780 4775 4770 4765 4760 4755 4750 Pt • 11,400 11,600 11,800 12,000 12,200 12,400 12,600 12,800 13,000 13,200 13,400 13,600 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 11,200 STREAM DISTANCE IN FEET ABOVE MOUTH 4785 4780 4775 4770 4765 4760 4755 13,800 w J_ LL 0 0 0 0 J LL ASHCROFT DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREA 05P ELEVATION IN FEET (NAVD) 4810 4805 4800 4795 4790 4785 4780 4775 4770 14,000 14,200 14,400 14,600 14,800 15,000 15,200 15,400 15,600 15,800 16,000 16,200 13,800 STREAM DISTANCE IN FEET ABOVE MOUTH 4810 4805 4800 4795 4790 4785 4780 4775 16,400 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY ASHCROFT DRAW WELD COUNTY, CO AND INCORPORATED AREAS 06P ELEVATION IN FEET (NAVD) 4815 4810 4805 4800 4795 • { W Lu t" - d • I` 16,600 16,800 17,000 17,200 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD AVANYAVA STREAM BED CROSS SECTION LOCATION 16,400 STREAM DISTANCE IN FEET ABOVE MOUTH 4815 4810 4805 4800 4795 FLOOD PROFILES ASHCROFT DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREA 07P 4,730 4,720 4,710 4,700 0 4,690 I w w z z 4,680 4,670 4,660 4,650 w cT w a 0 M CONFLUENC a d O 0 U _ • 4,730 4,640 0 LEGEND 0.2% ANNUAL CHANCE FLOOD - . - - - - • - - - - - "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4, 720 4,710 4,700 4,690 4,680 4,670 4,660 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 FLOOD PROFILES Ice LL] ce Z O 0 2 O 2 I C9 m FEDERAL EMERGENCY MANAGEMENT AGENC WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 08P a w w LU Ill 4,740 4,730 4,720 4,710 4,700 4,690_ 4,680 4,670 4,660 4,650 6,500 4,740 4,730 14,720 4,710 4,700 FLOOD PROFILES BIG THOMPSON RIVER - . - -- __ -- 4,690 —� ��r - _--� _ -T' _�� r ~ _ _�r� �� • 4,680 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4 4,670 .. LEGEND - 0.2% ANNUAL _ CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION -•.-••-••-••- - - "1%+" ANNUAL - 1% ANNUAL CHANCE 2% ANNUAL CHANCE - - • - - • - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE . . . „;;;;‘,0%,/"..., STREAM BED o CROSS SECTION 7,000 7,500 8,000 — 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 13,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER D9P 4,750 -- FLOOD PROFILES BIG THOMPSON RIVER 4,740 r 4,750 4,730 r, c a C a 2 4,740 4,720 E 4,730 0 a ? 4,710 4,720 Lu Lu 4,710 u_ r �' �� Q 4,700 — _ �r 4,700 > -- __— • - ter! - . r ~--- - - - • FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,690 �r ,,_ 4,690 4,680 4,680 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - '1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD n 4,670 2%ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD A(lI/� STREAM BED 0 CROSS SECTION LOCATION 4,660 - 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 17,500 16,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 18,500 19,000 19,500 1 OP 4,760 - 4,760 FLOOD PROFILES BIG THOMPSON RIVER 4,750 4,750 4,740 _ .. ---- - — - - - 4,740 4,730 - 4,730 a ? 4,720 4,720 w w z 4,710 - 4,710 a _ � _ J T ---- -- -fir ` __ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,700 4,700 ------------ 4,690 4 4,690 LEGEND 0,2% ANNUAL CHANCE FLOOD - . - - • - . - - "1%+" ANNUAL CHANCE FLOOD - — FLOOD 1% ANNUAL CHANCE 4,680 2% ANNUAL CHANCE FLOOD •- — — — • - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD it }lam_ VW STREAM BED 0 CROSS SECTION LOCATION 4,670 19,500 20,000 20,500 21,000 21,500 STREAM 22,000 DISTANCE 22,500 IN FEET ABOVE 23,000 CONFLUENCE 23,500 WITH SOUTH 24,000 PLATTE RIVER 24,500 25,000 25,500 26,000 1 1 P 4,770 4,760 4,750 4,740 0 ? 4,730 w w u_ z z j 4,720 4,710 4,700 4,690 4,680 26,000 - - 4,770 4,760 4,750 4,740 4,730 4,720 FLOOD PROFILES BIG THOMPSON RIVER - oUNTY ROAD --- - - " - ^ _ _ , - - _ - ---------_ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS _ _ . _ 4,710 LEGEND CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION 4,700 0.2% ANNUAL -..-••-••-,•- "1%+•ANNUAL - 1% ANNUAL CHANCE 2%ANNUAL CHANCE - - • - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE STREAM BED CROSS SECTION 26,500 - 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 31,000 31,500 32,000 32,500 1 2P 4,780 4,780 FLOOD PROFILES BIG THOMPSON RIVER 4,770 Et W ik- 2 O 0 _ I l.3NTY ROAD 21 F LITTLE TI -E0 .4,770 i 4,760 4,760 4,750 CONFLUENCE 4,750 ? 4,740 4,740 w w w _ _ .. r Q 4, - -� 4,730 730 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS - 4,720 4,720 - 4,710 4,710 LEGEND 0.2% ANNUAL CHANCE FLOOD - - . - • • - . • - • • - "l%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,700 - - - 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD f� STREAM BED CI CROSS SECTION LOCATION 4,690 32,500 33,000 33,500 34,000 34,500 STREAM 35,000 DISTANCE 35,500 IN FEET ABOVE 36,000 CONFLUENCE 36,500 WITH SOUTH 37,000 PLATTE RIVER 37,500 38,000 38,500 39,000 13P P 4,790 - 4,790 FLOOD PROFILES BIG THOMPSON RIVER 4,780 4,780 4,770 aft 11 K., W/kY ILROAD BR]DG 4,760 4,770 4,760 F. 4,750 f � w .. .. 4,750 z� ¢4,740 - `r • .- �� - - rr _ _ w_ __ ____-.:---7-1. _ _�- _ __ __ _ _-__ 4,740 - r- `_ ..rte �.. _ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,730 . h. 4,730 4,720 ___ . 4 - . ' - - . - " - - -^ "1%+' ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,710 2% ANNUAL CHANCE FLOOD - - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD „/Yf/w\\ STREAM BED n CROSS SECTION LOCATION 4,700 39,000 39,500 40,000 40,500 41,000 41,500 42,000 42,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 43,000 WITH SOUTH 43,500 PLATTE RIVER 44,000 44,500 45,000 45,500 14P 4,800 4,800 FLOOD PROFILES - BIG THOMPSON RIVER L 4,790 4,790 4,780 4,780 4,770 4,770 ¢ ? 4,760 _ ^ - - �= 4,760 - _ -- 0 4,750 Yr - 4,750 �_ W 4,740 r--- -~ 4,740 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,730 y'tf ~tf --- -- 4 4,730 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • ^ • • - • ^ "1%+^ ANNUAL CHANCE FLOOD '--` 1% ANNUAL CHANCE FLOOD 4,720 -- 2% ANNUAL CHANCE FLOOD - "-' 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD okkokk,"STREAM BED r p 1 CROSS SECTION LOCATION 4,710 45,500 46,000 46,500 47,000 47,500 48,000 48,500 49,000 49,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH 50,000 PLATTE RIVER 50,500 51,000 51,500 52,000 1 5P 4,810 - 4,810 FLOOD PROFILES BIG THOMPSON RIVER 4,800 4,800 4,790 2 0 4,790 4,780 I 4,780 a ? 4,770 -- 4,770 _ - 4,760 _�.-_ - r - - - ___ -___ 4,760 ' _� -'-T—�- in FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,750 4,750 _ i - - 4,740 4,740 - - - - - - - _ _ LEGEND 0.2% FLOOD ANNUAL CHANCE -' • - • • - • • -' ' - "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD - 4,730 _ - 2%ANNUAL CHANCE FLOOD - — - — — • - 4% ANNUAL CHANCE FLOOD -- - - "' `" '- - 10% ANNUAL CHANCE FLOOD 4"AWW STREAM BED A CROSS SECTION LOCATION 4,720 - 52,000 52,500 53,000 53,500 54,000 54,500 55,000 55,500 56,000 56,500 57,000 57,500 58,000 58,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 16P 4,820 4,810 4,800 4,790 v ? 4,780 LU Q 4,770 J- W 4,760 4,750 4,740 4,820 FLOOD PROFILES BIG THOMPSON RIVER - - 4,810 4,800 4,790 4,780 ' ' _- - • -- �, ----- �-- ---- Y-- " .r,,-�� 4,770 4,760 ^ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS _ 4,750 LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION _.._.._' -..- '1%+" ANNUAL - - 1% ANNUAL CHANCE - 2% ANNUAL CHANCE - - - - - . - 4%ANNUAL CHANCE - - 10% ANNUAL CHANCE f%�Y/�� STREAM BED r 1 CROSS SECTION 4,730 58,500 59,000 59,500 60,000 60,500 61,000 61,500 62,000 62,500 63,000 63,500 64,000 64,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 65,000 1 7 P 4,830 - 4,830 FLOOD PROFILES BIG THOMPSON RIVER 4,820 "' 4,820 4,810 UNTY ROAD 1 ILROA❑ BRIDGI 4,810 4,800 4,800 0 a ? 4,790 •4,790 • 4,780 � �� _ ....,..._ ,.,_�_��_ 4,780 Lu W r X• 4,770 4,770 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS T 4,760 4 4,760 LEGEND 0.2% ANNUAL CHANCE FLOOD - ' • - • • - • • - ' • - "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,750 2% ANNUAL CHANCE FLOOD - - -' - - - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD S oC STREAM BED CICROSS SECTION LOCATION 4,740 65,000 65,500 66,000 66,500 67,000 STREAM 67,500 DISTANCE 68,000 IN FEET ABOVE 68,500 CONFLUENCE 69,000 WITH SOUTH 69,500 PLATTE RIVER 70,000 70,500 71,000 71,500 1 8P 4,850 4,850 FLOOD PROFILES BIG THOMPSON RIVER 4,840 3 SPLIT 4,840 4,830 ENCE OF CR 1 UNTY ROAD 4,830 4,820 CONFLI 4,820 ? 4,810 4,810 w w �.. z 4,800 f ,�- _ _ 4,800 T_` __ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,790 r ' - - - -_-- -- _ ---- -_---: 4,790 • 4,7$0 4 4,780 LEGEND - - - - F 0.2% ANNUAL CHANCE FLOOD - • ' - • • - ' ' - • - - "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,770 - 2% ANNUAL CHANCE FLOOD - - ' - - ' - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD Ali ~). STREAM BED 1 CROSS SECTION LOCATION 4,760 71,500 72,000 72,500 73,000 73,500 74,000 74,500 STREAM DISTANCE IN FEET ABOVE 75,000 CONFLUENCE 75,500 WITH SOUTH 76,000 PLATTE RIVER 76,500 77,000 77,500 78,000 1 8(a)P 4,860 4,860 FLOOD PROFILES BIG THOMPSON RIVER 4,850 4,850 4,840 UNTY BOUND 4,840 4,830 , {, 4,830 v ? 4,820 4,820 I - w LL z z 4 4,810 .� _rr 4,810 Q w _: _ f -� �- -�---2=-___ -• _ may_ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS .rr 4,800 r ...---__.- ____--__--4,800 4,790 4 4,790 LEGEND FLOOD 0.2% ANNUAL CHANCE - .. - -. - •• - . - '1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 4,780 - 2%ANNUAL CHANCE FLOOD • - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD W / \/ .W.STREAM BED f CROSS SECTION LOCATION 4,770 78,000 78,500 79,000 79,500 80,000 STREAM 80,500 DISTANCE 81,000 IN FEET ABOVE 81,500 CONFLUENCE 82,000 WITH SOUTH 82,500 PLATTE RIVER 83,000 83,500 84,000 84,500 1 8(b)P 4,830 4,825 4,820 4,815 I ? 4,810 I - w w z O P 4,805 LLJ LLJ 4,800 ' 4,795 4,790 4,830 FLOOD PROFILES BIG THOMPSON RIVER - CR 13 SPLIT 'QIPSON RIVER MPSON RIVER 4,825 WITH BIG THO ROM BIG TH0 4,820 CONFLUENCE DIVERGENCE 4,815 4,810 f 4,805 r . FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS r r r r . r" 1 r ` r.-- rrr - - 4,800 4,795 _r�' LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION - • • - • • - • • - • • - '1%+"ANNUAL - - 1% ANNUAL CHANCE - - • - - - - 2% ANNUAL CHANCE 4% ANNUAL CHANCE - 10% ANNUAL CHANCE f aj $ OW"e" [ STREAM BED CROSS SECTION 4,785 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 6,000 6,500 1 9P 4,885 4,885 FLOOD PROFILES BOULDER CREEK 4,880 IN CREEK 4,880 4,875 CE WITH T. V 4,875 4,870 CCNFLUEN r / - / 4,870 Sr ? 4,665 PROFILE B SEL1NE COINCIDENT �f '" r• t rr r r r Jr __.•- r 4 865 w LLI WITH T. VRAIN CREEK • r •Prbi _ ..-rr -_ ' 4,860p f.� �-- r •— .......- 4,860 w w 4,855 --` -- y r r r r__ � 4,855 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS CON\ 4,850 - 4,850 LEGEND 0.2% ANNUAL CHANCE FLOOD -.---•-••-••- "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD p C 4,845 -- 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10'/, ANNUAL CHANCE FLOOD /�7l•77� AtY/11 /s� STREAM BED CROSS SECTION LOCATION 4,840 0 500 1,000 1,500 2,000 2,500 STREAM DISTANCE 3,000 IN FEET ABOVE 3,500 CONFLUENCE 4,000 WITH ST. 4,500 VRAIN CREEK 5,000 5,500 6,000 6,500 20P 4,900 4,900 FLOOD PROFILES BOULDER CREEK 4,895 in r: — - 4,895 4,890 -! I )LINTY ROAD 2( - 1rY- � x 4,890 4,885 • r 1 r 4--- r• r r rr� r r 4,885 ? 4,880 r �r • r -• r . 4,880 I Wr Z O 4,875 �r� -r err~ r r 1 r- r. err �___- 4,875 w_�- J w 4,870 - 4,870 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,865 . . 4 4,865 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%-r ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,860 - 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD W STREAM BED 0 CROSS SECTION LOCATION 4,855 6,500 7,000 7,500 8,000 8,500 9,000 STREAM DISTANCE 9,500 IN FEET ABOVE 10,000 CONFLUENCE 10,500 WITH ST. 11,000 VRAIN CREEK 11,500 12,000 12,500 13,000 21 P 4,920 4,920 FLOOD PROFILES BOULDER CREEK 4,915 uJ w U 4,915 4,910 cl ENCE OF IDAH( r- 4,910 4,905 _._- - CONFLU r rr 4905 IS� Q 4,900��r r r r r r r r_ rr ; r - 4,900 w r r f' �// err t { 4,895 - 4,895 J W r r r rr' fr y l FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,890 4,890 4,885 4 4,885 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-•'-''- "1%+"ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,880 2%ANNUAL CHANCE FLOOD V V - - - - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD fj�ti STREAM BED o CROSS SECTION LOCATION I 4,875 . . 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ST. 17,500 18,000 18,500 19,000 19,500 VRAIN CREEK 22P 4,935 4,935 FLOOD PROFILES BOULDER CREEK 4,930 I - 4,930 '• � �' rr . r �� i � r� r 1 1 4 925 - r ` 1 rr�rr 4,925 4,920 . I ,r7.:--' ,,, �� -_ _!-- - _-� - •rI':' 4,920 I _. Q ?4915 . :-- -� 4,915 w Lu O — 4,910 '.- ..._ rr 4,910 w w 4,905 ,. {��`�fl IUNTY ROAD 1 4,905 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,900 c� 4 4,900 LEGEND 0.2% ANNUAL CHANCE FLOOD T '-- ---- -- "1%+" ANNUAL CHANCE FLOOD I - - 1% ANNUAL CHANCE FLOOD 4,895 2% ANNUAL CHANCE FLOOD •--• -- • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD ��\t STREAM BED CCROSS SECTION LOCATION 4,890 19,500 20,000 20,500 21,000 21,500 22,000 STREAM DISTANCE 22,500 IN FEET ABOVE 23,000 CONFLUENCE 23,500 WITH ST. 24,000 VRAIN CREEK 24,500 25,000 25,500 26,000 23P Q ? LLI z z J W 4,960 4,955 4,950 4,945 4,940. 4,935 4,930 4,925 4,920 4,915 26,000 - - 4,960 4,955 4,950 4,945 4,940 4,935 4,930 4,925 FLOOD PROFILES BOULDER CREEK I r r 2 f II r --- f{ � r - ,...5.---:•-"----- ,..----' _..---- f r ryr y r� _ ---- l • r+ f FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION -••-••-••-••- "1%+" ANNUAL - 1% ANNUAL CHANCE 2% ANNUAL CHANCE - - • - - - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE dm/\\ STREAM BED I ❑ CROSS SECTION �} 26,500 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ST. VRAIN CREEK 31,000 31,500 32,000 32,500 24P 4,975 4,975 FLOOD PROFILES BOULDER CREEK 4,970 JNDARY 4,970 4,965 2 a R COUNTY BOt 4,965 4,960 BOULD 4,960 El a z 4,955 ... 4,955 I - w LL z O 4,950 �! :. 4,950 _I 4,945 - - --- - r ---W 1� f f - - - . - -- .- -- - 4,945 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,940 ..v..z ., 4 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,935 - 2%ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD *now", STREAM BED 0 CROSS SECTION LOCATION 4,930 - - - - - 31,000 31,500 32,000 32,500 33,000 33,500 34,000 34,500 35,000 35,500 36,000 36,500 37,000 37,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ST. VRA1N CREEK 25P 4,630 4,625 4,620 4,615 0 Z 4,610 LU w u_ 4,605 Lug'` 4,600 4,595 4,590 4,585 0 - - - 4,630 4,625 4,620 4,615 4,610 4605 4,600 FLOOD PROFILES CACHE LA POUDRE RIVER LTTE RIVER . WITH SOUTH .. O Z w _J LL z 0 U FLOODIN r EFFECTS F OM SOOT PLATTE RI ERco - .. __- __^ - , - r �- -._� _ - -- r J _ _ --T-- - ^�-- -� __ _ _-------- _ _ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS - -- 4,595 LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD' FLOOD FLOOD FLOOD FLOOD LOCATION - • • - • • - • • - • • - "1%+" ANNUAL 1% ANNUAL CHANCE - - 2% ANNUAL CHANCE - - - - - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE - - - - - - - - - - /"1/"YeD� STREAM BED 1 CROSS SECTION • DATA NOT AVAILABLE 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 26P 1 dRlR 4,635 FLOOD PROFILES CACHE LA POUDRE RIVER 4,630 4,625 'ION IN FEET (NAVD88) s. 41. A a 1) W 0) N P CJl p C - ,WELC 4,620 4,615 �--- ____- 4,610 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS rti% / 4,605 LF,vuu 4,600 I LEGEND 0,2 CHANCE FLOOD h ANNUAL - • ^-•� - - • ' - - 11%4' ANNUAL CHANCE FLOOD` 1%ANNUAL CHANCE FLOOD 4,595 - 2% ANNUAL CHANCE FLOOD E . - - • - - • - 4°%ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD lfnOti STREAM BED A CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,590 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 12,000 12,500 13,000 27P 4,640 - -- - -' - - 4,640 FLOOD PROFILES CACHE LA POUDRE RIVER 4,635 .. UDRE RIVER - UDRE RIVER - T SFP 4,635 4,630 FERN AVENUE F CACHE LA P ARRA PITS SF F CACHE LA P OF 8TH STRE 4,630 rONFLUENGE :0NFLUENCE NORT 4,625 4,625 v • c7 co -Z--------=------ . ---- - 4 620 r - 4,620 , �. - i- - --_ � � —— "�� - fr 4,615 � � —rte._ 4,615 LLI r �r1 w 4,610 r _,-1 - - ~\1Wks 4,610 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,605 ir_ti�fah�/ - - - -- al 4,605 LEGEND 02%ANNUAL CHANCE FLOOD - ' ' - ' ' - ' ' - - ' - "1%+" ANNUAL CHANCE FLOOD' 1% ANNUAL CHANCE FLOOD 4,600 2% ANNUAL CHANCE FLOOD - - - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD - t� fS - _ C - - - - - - - - //�� STREAM BED 0 CROSS SECTION LOCATION A ' DATA NOT AVAILABLE 4,595 13,000 13,500 14,000 14,500 15,000 STREAM 15,500 DISTANCE 16,000 IN FEET ABOVE 16,500 CONFLUENCE 17,000 WITH SOUTH 17,500 PLATTE RIVER 18,000 18,500 19,000 19,500 28P 4,650 4,645 4,640 4,635 z 4,630 Lu W o 4,625 W 4,620 4,615 ' 4,610 I FLOOD PROFILES CACHE LA POUDRE RIVER 4,650 4,645 4,640 4,635 - - - - -- 4,630 4,625 - . ., . - _ ,- �- FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,620 4,615 LEGEND FLOOD CHANCE FLOOD' FLOOD FLOOD FLOOD FLOOD LOCATION 0.2% ANNUAL CHANCE -'•-..-••-"- "1%+"ANNUAL ••••2%ANNUAL 1% ANNUAL CHANCE CHANCE - 4% ANNUAL CHANCE - 10% ANNUAL CHANCE - - �� STREAM BED p 1 CROSS SECTION �J • DATA NOTAVAILAELE 4,605 19,500 20,000 20,500 21,000 21,500 22,000 22,500 23,000 23,500 24,000 24,500 25,000 25,500 26,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 29P 4,660 4,660 ;H AVENUE 1ESS ROAD HIGHWAY 85 'H STREET H STREET 4 4,655 ,655 4,650 ,650 4,645 OD a z 4,640 LLl LLJ LL z z O 4,635 w J LLI 4,630 4,625 4,620 4,615 26,000 26,500 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 31,000 31,500 32,000 ,645 ,640 ,635 4,630 4,625 32,500 C/) W J FLOOD PROF ce W J W O 0 J W U U FEDERAL EMERGENCY MANAGEMENT AGENCY O U O 0 J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 30P 4,670 - 4,670 FLOOD PROFILES CACHE LA POUDRE RIVER 4,665a. I w Dix o O0 L r 4,665 4,660 0 wz Lu �, ti! 4,660 4,655 p., O ci 4,655 ....LI...., ,.,, _ co 2 4,650 _' — . - —, � ` . �_� `4,650 0 4,645 � _ _ - 4,645 I rr LJLI T - ^� �r�ry 4,640 - 4,640 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,635 4 4,635 ' . LEGEND 0.2% ANNUAL CHANCE FLOOD L -• • -• • -.•- - "1%+"ANNUAL CHANCE FLOOD' - - 1% ANNUAL CHANCE FLOOD 4,630 - 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD . . . - - STREAM BED w I Q 1 CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,625 32,500 33,000 33,500 34,000 34,500 35,000 35,500 36,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 36,500 WITH SOUTH 37,000 PLATTE RIVER 37,500 38,000 38,500 39,000 31P 4,675 4,670 4,665 4,660 00 CO 4,655 I- w w u_ z z O 4,650 w 4,645 4,640 4,635 4,630 39,000 u 0 U a C _ ARK SFP DUDRE RIVER - AD SFP POUDRE LIVER TRAIL JDRE RIVER a u c1 JI VltiV] fL LlS LAND GROVE f F CACHE LAP AM OF RAILR a -{;.C.: � ..L\ C NORTH IE CONFLUENCE UPSTR ___ — ' rte^ ---- ~ ~ r I LEGEND 0.2% ANNUAL CHANCE FLOOD - • - • • - - - - • - - "1%+" ANNUAL CHANCE FLOOD' - 1% ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD - - ' - ' - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD - - _ - - ' STREAM BED CROSS SECTION LOCATION ' DATA NOT AVAILABLE 39,500 40,000 40,500 41,000 41,500 42,000 42,500 43,000 43,500 44,000 44,500 45,000 ,675 ,670 ,665 ,660 ,655 ,650 4,645 4,640 45,500 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 32P 4,685 4,685 FLOOD PROFILES CACHE LA POUDRE RIVER 4,680 4,680 4,675 N 25TH AVENU - - 4,675 ~rte`-'��r 4,670 _4,670 z 4,665 4,865 Ili Lu Z O 4,660 a Y _ � r r 5555 .r r r r r - 4,660 > 4,655 4,655 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,650 4,650I rtI/ LEGEND 0 2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%+^ANNUAL CHANCE FLOOD' 1% ANNUAL CHANCE FLOOD 4,645 - 2% ANNUAL CHANCE FLOOD - - ' - - ' - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD �� STREAM BED CROSS SECTION LOCATION •O T&,4 o1AvanAILe 4,640 45,500 46,000 46,500 47,000 47,500 STREAM 48,000 DISTANCE 48,500 IN FEET ABOVE 49,000 CONFLUENCE 49,500 WITH SOUTH 50,000 PLATTE RIVER 50,500 51,000 51,500 52,000 33P 4,695 4 4 r _ r3~ I LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD' - - 1% ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD STREAM BED V CROSS SECTION LOCATION - - - - - - - • DATA NOT AVAI LADLE DUDRE RIVER - E PITS 5FP iI V 35TH AVENUE F CACHE LA P Q 35TH AVEN CONFLUENCE RAILROAD ,695 4,690 ,690 4,685 ,685 4,680 co 7 z 4,675 I- w w w z_ z 4,670 w J uJ 4,665 4,660 4,655 4,650 52,000 52,500 53,000 53,500 54,000 54,500 55,000 55,500 56,000 56,500 57,000 57,500 58,000 ,680 ,675 ,670 4,665 4,660 58,500 W cc W O O O J 2 O FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U I--- 0 O 0 J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 34P d Tin , 4,710 FLOOD PROFILES CACHE LA POUDRE RIVER — - C O CC 4,705 4,700 ELEVATION IN FEET (NAVD88) y co W f0 cco 4 1 4 l \ \\ IL I 4 i1 1 4 1 I \\ I \\\ 4 CONFLUENC ti 4 - - i 4 I 11 } it \ ‘ 4,695 4,690 err LL ___ rrY - - __ _ �` / .4'er i 4,685 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS -,4,680 4,675 LEGEND - - 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%4" ANNUAL CHANCE FLOOD* - - 1% ANNUAL CHANCE FLOOD 4,670 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD .. Yx - - - - - "Y STREAM BED j CROSS SECTION LOCATION C:11:1 • DATA NOT AVAILABLE 4,665 58,500 59,000 59,500 60,000 60,500 61,000 STREAM DISTANCE 61,500 IN FEET ABOVE 62,000 CONFLUENCE 62,500 WITH SOUTH 63,000 PLATTE RIVER 63,500 64,000 64,500 65,000 35P 4,715 4,710 4,705 4,700 co z 4,695 LLI 7 ¢4,690 LU 4,685 4,680 4,675 4,670 65,000 4,715 4,710 4,705 4,700 4,695 4,690 4,685 4,680 FLOOD PROFILES CACHE LA POUDRE RIVER I - - . I - r _ -te r- - ---- - ---- �� __� __- __ _... -- - - -- FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS t LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD' FLOOD FLOOD FLOOD FLOOD LOCATION -••-••-••-••- "1%4-' ANNUAL - - 1% ANNUAL CHANCE 2% ANNUAL CHANCE - - • - 4% ANNUAL CHANCE - 10% ANNUAL CHANCE - - - 4A\r"~%` STREAM BED A CROSS SECTION • DATA NOT AVAILABLE 65,500 66,000 66,500 67,000 67,500 68,000 68,500 69,000 69,500 70,000 70,500 71,000 71,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 36P d 77n FLOOD PROFILES CACHE LA POUDRE RIVER � a - O — — r csi o cn c 5TH AVENUE P DRAW 4,720 JENCE OF SHE - 4,715 CONF 4,710 .4,705 - .��- - �� 4,700 ___ _r�-_ __. --- - - r r~�. r��-------------�..r ...____.--___T --------- r~� 4,695 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,690 AD 4,685 4 0.2% ANNUAL CHANCE FLOOD - '-•'- - -'-- '1%+" ANNUAL CHANCE FLOOD' - 1% ANNUAL CHANCE FLOOD 4,680 2% ANNUAL CHANCE FLOOD ' - - . - - ' - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD BC Ewv4 STREAM BED ( p j CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,675 71,500 72,000 72,500 73,000 73,500 74,000 74,500 75,000 75,500 76,000 76,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 77,000 77,500 78,000 37P 4,725 A 7 4,720 71ST AVENUE Lu e Lu ITS SFP Q CD - 1 N P O CJ1 O U10. C FLOOD PROFILES CACHE LA POUDRE RIVER 4,715 z, n D 0 CL u.l 0 83RD AVENUE 4,710 :LUENCE OF C, LL 2 a LLI I -- co z o o co _- a 4,705 T ' �� . �. _____.=--- _F- -~ .� zf ------ _ r -_~-_ -_T -- �__ - a4,700 _i -- --Li 4,695 I 4,690 LEGEND 02% ANNUAL CHANCE FLOOD C :EDERAL EMERGENCY MANAI WELD COUN1 AND INCORPORATE -''-•'--•-'•- "1%+" ANNUAL CHANCE FLOOD' - - 1%ANNUAL CHANCE FLOOD 4,685 2% ANNUAL CHANCE FLOOD - - ' - - ' - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD AE AF AG +W STREAM BED CROSS SECTION LOCATION al ' DATA NOT AVAILABLE 4,680 78,000 78,500 79,000 79,500 80,000 80,500 81,000 81,500 82,000 82,500 83,000 83,500 84,000 84,500 " STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 38P d 7Qn FLOOD PROFILES CACHE LA POUDRE RIVER ELEVATION IN FEET (NAVD88) - a V CD Q 0 - N N •-•4 . . C{ CT c• U78 crr a cn [ i1 . 4 \ , _ _ I . • 1111 I I . . . 1 I II . t , \ • , • • • _II. t . \ 11 1 1 1ti \•\.\\\ • ..., I 1 • DIVERGENCE OF Cr.CHE LA POUORE RIVER = DOWNSTREAM Of! 83RD AVENUE PITS SFP IDRE RIVER — SFP w z Ili L . 4,730 F CACHE LA P 83RD AVENUE 83RD AV 4,725 ONFLUENCE OVE 4,720 4,715 f 1 1. . f . 7 .F a r. 4,710 ' r Tom_-��r rrl 4,705 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS • 4,700 Alt AL 4,695 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-•"-"-••- "1%+^ANNUAL CHANCE FLOOD" 1% ANNUAL CHANCE FLOOD 4,690 2% ANNUAL CHANCE FLOOD " -- - ' - 4% ANNUAL CHANCE FLOOD - ^' 10% ANNUAL CHANCE FLOOD AH AI AJ /i'/~ STREAM BED ( p CROSS SECTION LOCATION DATA HOTAVA+LA&LE 4,685 84,500 85,000 85,500 86,000 86,500 87,000 87,500 88,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 88,500 WITH SOUTH 89,000 PLATTE RIVER 89,500 90,000 90,500 91,000 39P 4,740 4,735 4,730 4,725 03 Z 4,720 LU w LL 6 a 4,715 w J w 4,710 4,705 4,700 4,695 91,000 X > E ii.l ry .. RE RIVER - TS SFP E RIVER - SFP UDRE RIVER LiE PITS SFP e CHE LA POUD D AVENUE SF CHE LA POUD RD AVENUE P CHE LA POUD TH AVENUE PIT }F CACHE LA P TO 25TH AVEil _ DIV RGENCE OF C OVER 33 CON LUENCE OF C PSTREAM OF =LUENCE OF C 5 AVENUE TO 2 , DIVERGENCE f 35TH AVENU O r ter— ^r —T _ err �- �- — .. .. LEGEND D.2'/ ANNUAL CHANCE FLOOD CHANCE FLOOD* FLOOD FLOOD FLOOD FLOOD LOCATION — • • — • • — • • - — • ' — "1%+" ANNUAL 1% ANNUAL CHANCE 2% ANNUAL CHANCE - - ' - - • - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE STREAM BED j CROSS SECTION 1:::::) ti} • DATA NOT AVAJLABLE 91,500 92,000 92,500 93,000 93,500 94,000 94,500 95,000 95,500 96,000 96,500 97,000 ,740 ,735 ,730 ,725 ,720 ,715 4,710 4,705 97,500 W J_ LL 0 a_ 0 0 J LL FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U z ❑ 0 O J AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 40P 4,750 4,750 FLOOD PROFILES CACHE LA POUDRE RIVER 4,745 , D 4,745 4,740 4,740 4,735 4,735 co co 0 24,730 -- LLI LL — -- r �r4,730 ,— r er r 4,725 —~� — ili ! _! — — �r— !�, 4,725 LLI r 1 _ - 4,720 - r4 4,720 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS I 4,715 AO 4,715 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-. •-••-••- "1%+" ANNUAL CHANCE FLOOD* - - 1% ANNUAL CHANCE FLOOD 4 710 - 2% ANNUAL CHANCE FLOOD - - - - - - - 4%ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD AN , 7A�/Q1 STREAM BED (-1:1 CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,705 97,500 98,000 98,500 99,000 99,500 100,000 100,500 101,000 101,500 102,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 102,500 103,000 103,500 104,000 41P 4,755 4,755 FLOOD PROFILES CACHE LA POUDRE RIVER 4,750 _ -, m NICE OF V DITCH - L NICE OF DITCH - E 4,750 4,745 CI CI c_ CONFLU JOHN LA J } JCONFLU JOHN LA a 3 4,745 4,740 ONFLUENCE OF HN LAW DITCH •R 23 FLOW PA1 4,740 Liu - 4,730 _�, _ _� _�- -- 4,730 w 4,725 _ 4,725 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS Afl yam— 4,720 4,720 LEGEND FLOOD 0.2% ANNUAL CHANCE - • - • • - • • - • • - '13/4+" ANNUAL CHANCE FLOOD' �- 1% ANNUAL CHANCE FLOOD 4,715 2% ANNUAL CHANCE FLOOD ' - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD AP - - It STREAM BED 0 CROSS SECTION LOCATION • DATA NOT AVAILABLE - - 4,710 104,000 104,500 -- 105,000 105,500 106,000 STREAM 106,500 DISTANCE 107,000 IN FEET ABOVE 107,500 CONFLUENCE 108,000 WITH SOUTH 108,500 PLATTE RIVER 109,000 - 109,500 110,000 110,500 42P 4,760 4,760 FLOOD PROFILES CACHE LA POUDRE RIVER 4,755 r U H- o ,SORE RIVER - UDRE RIVER - LANT SFP 4,755 4,750 z O w o w . CACHE LA PO KODAK SFP =CACHE LAP R TREATMENT 4,750 4,745 LI O NFLUENCE O DNFLUENCE OI WASTE WATE 4,745 I • ?4,740 _ ' —� 4,740 _ _ --� �- --- a 4735 --� - - - -- _T `_~- ------ . 4,735 , w J 4,730 •-- ,� ,� 4,730 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,725 4,725 - - - - - LEGEND 0.2% ANNUAL CHANCE FLOOD I - • • - • • - - - - • • - "1%+" ANNUAL CHANCE FLOOD" - - 1% ANNUAL CHANCE FLOOD 4,7,20 - 2% ANNUAL CHANCE FLOOD - - - - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD AR "ve, STREAM BED CROSS SECTION LOCATION DATA NOT AVAILABLE 4,715 110,500 111,000 111,500 112,000 112,500 113,000 113,500 114,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 114,500 WITH SOUTH 115,000 PLATTE RIVER 115,500 116,000 116,500 117,000 43P 4,765 1 4,760 4,755 4,750 ? 4,745 I- w w L Z i Z I L: O T.�= L. • 4,740 -I -I--# w 1° 1 4,735 4,730 4,725 4,720 120,000 117,000 117,500 j 118,000 118,500 . .. 119,000 119,500 • I 1 4,765 . .•. j. 4,760 LEGEND 0 2% ANNUAL CHANCE FLOOD "1%4" ANNUAL CHANCE FLOOD' 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 'DATA NOT AVAILABLE 4,755 4 750 4,745 4,740 -4,735 4,730 120,500 121,000 121,500 122,000 122,500 123,000 123,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U z 0 U - J CACHE LA POUDRE RIVER AND INCORPORATED AREAS 44P 4,775 4,770 4,765 4,760 O J 4,755 I - w w LL z_ z O 4,750 W 4,745 4,740 -- 4,735 I AV J 4,730 123,500 l 124,500 125,000 125, 500 126,000 126,500 127,000 124,000 127,500 128,000 4,775 4,770 4,765 1 14, 760 - yr_ "I ---- -w--- 128,500 O: LEGEND 0 2% ANNUAL CHANCE FLOOD ANNUAL CHANCE FLOOD* 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION • DATA NOT AVAILABLE 129,000 129,500 4,755 4,750 4,745 4,740 130,000 FLOOD PROFILES CACHE LA POUDRE RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 45P J W 4,780 G. _._1...s..i 4,775 4,770 4,765 • . 4,750 4,745 4,740 L— L (AY • 4,735 LH 130,000 130,500 i 1, I 131,000 131,500 1 Az I - 132,000 132,500 ftr 133,000 133,500 134,000 134,500 4,780 4,775 4,770 4,765 _.L..._4760 4,755 '4,750 4,745 LEGEND 02% ANNUAL CHANCE FLOOD "1%+" ANNUAL CHANCE FLOOD" 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION • DATA NOT AVNLABLE 135,000 135,500 136,000 136,500 FLOOD PROFILES CACHE LA POUDRE RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U H z J 0 O J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 46P Ia Tan FLOOD PROFILES CACHE LA POUDRE RIVER 4,790 4,785 ELEVATION IN FEET (NAVD88) 01 O) a) V ~ C 01 CD CJ1 d 01 C f' :I 11 DIVERGENCE ( Va II 1 I 11 14 \\\.. 1 \ l \li \ \ 4,780 X4,775 4,770 4,765 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS f - - - 4,760 4,755 LEGEND 0.2%ANNUAL CHANCE FLOOD - ' " • - "-" • "' - "--• "1%+" ANNUAL CHANCE FLOOD` 1% ANNUAL CHANCE FLOOD 4,750 2% ANNUAL CHANCE FLOOD - - - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD BD /yAko.t STREAM BED CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,745 136,500 137,000 137,500 138,000 138,500 139,000 139,500 140,000 140,500 141,000 141,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 142,000 142,500 143,000 46(a)P - .d Finn I I I 4,800 4,795 4,790 RIVATE DRIVE 4,785 co in .I CQI ii \ll 1 \ 41. -P a ti CO c cri o c FLOOI x4.780 4,775 — rte' ; —-- -- — --- `' om— Li W J T-- - - _� — ——� 4,770 y+r� qv/ — 4,765 — LEGEND 02% ANNUAL CHANCE FLOOD .L EMERGENCY MANA WELD COUN' AND INCORPORATE -^- ' -' - - .. - -' - "1%+" ANNUAL CHANCE FLOOD' - 1%ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4,760 - - ' - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD _ RF BF �0\ STREAM BED CROSS SECTION LOCATION - DATA NOT AVALLABLE 4,755 I - - I " 143,000 143,500 144,000 144,500 145,000 145,500 146,000 146,500 '147,000 147,500 148,000 148,500 149,000 149,500 STREAM DISTANCE IN FEETABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 46(b)P 4,805 4,800 4,795 4,790 n 4,785 I - W w u_ z_ z 0 a 4,780 4,775 4,770 4,765 4,760 150,000 150,500 151,000 151,500 149,500 cr z 0 U) w a U C w 2 I- I 152,000 152,500 1 W z J }.c2 00 OC yr. . _'ter- --- BH LEGEND 0 2% ANNUAL CHANCE FLOOD -••-••-••-•'- '1%+" ANNUAL CHANCE FLOOD* 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD • - 4% ANNUAL CHANCE FLOOD 1D%ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,805 4,800 4,795 4,790 4,785 4,780 4,775 4,770 153,000 153,500 154,000 154,500 155,000 155,500 156,000 CACHE LA POUDRE RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY O O H z ❑ O O J w AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 46(c}P 4,750 4,745 4,740 4,735 as co Z 4,730 I- w w U - z_ z 0 a 4,725 w J w 4,720 4,715 4,710 ACHE LA POUWRE RIVER UENCE WIT U- z 0 U FLOODING m O w z- � o w cn ❑ O • O ▪ CIL U LU a• cs Ua EFFECTS F"OM CACHE LA POIJIDRH_RIVER DI 4,750 4,745 4,705 _ 0 -r 4,740 4,735 4,730 4,725 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- ^1%+"ANNUAL CHANCE FLOOD' - - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION • DATA NOT AVAILABLE 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 4,720 4,715 6,500 U) FLOOD PROFIL CACHE LA POUDRE RIVER - 35TH AVENUE TO 25TH AVENUE PITS SFP FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(d)P FLOOD INSURANCE STUDY VOLUME 3 OF 4 COMMUNITY NAME AULT, TOWN OF DACONO, CITY OF EATON, TOWN OF EVANS, CITY OF FIRESTONE, TOWN OF FORT LUPTON, CITY OF FREDERICK, TOWN OF GARDEN CITY, TOWN OF* GILCREST, TOWN OF GREELEY, CITY OF NUMBER 080179 080236 080180 080182 080241 080183 080244 080246 080213 080184 GROVER, TOWN OF* 080025 HUDSON, TOWN OF 080249 KEENESBURG, TOWN OF 080251 KERSEY, TOWN OF 080185 LASALLE, TOWN OF 080186 LOCHBUIE, TOWN OF* 080012 LONGMONT, CITY OF 080027 *No Special Flood Hazard Areas Identified REVISED: FLOOD INSURANCE STUDY NUMBER 08123CV003B Version Number 2.6.4.6 WELD COUNTY, COLORADO AND INCORPORATED AREAS COMMUNITY NAME MEAD, TOWN OF MILLIKEN, TOWN OF NUNN, TOWN OF PIERCE, TOWN OF PLATTEVILLE, TOWN OF RAYMER, TOWN OF* I SEVERANCE, TOWN OF WELD COUNTY, UNINCORPORATED AREAS WINDSOR, TOWN OF NUMBER 080218 080187 080188 080189 080190 080069 080317 080266 080264 REVISED PRELIMINARY 3/23/2022 FEMA TABLE OF CONTENTS Volume 1 Page SECTION 1.0 — INTRODUCTION 1.1 The National Flood Insurance Program 1.2 Purpose of this Flood Insurance Study Report 1.3 Jurisdictions Included in the Flood Insurance Study Project 1.4 Considerations for using this Flood Insurance Study Report SECTION 2.0 - FLOODPLAIN MANAGEMENT APPLICATIONS 2.1 Floodplain Boundaries 2.2 Floodways 2.3 Base Flood Elevations 2.4 Non -Encroachment Zones 2.5 Coastal Flood Hazard Areas 2.5.1 Water Elevations and the Effects of Waves 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 2.5.3 Dams sand Other Flood Hazard Reduction Measures 2.5.4 Levee Systems SECTION 3.0 — INSURANCE APPLICATIONS 3.1 National Flood Insurance Program Insurance Zones SECTION 4.0 — AREA STUDIED 4.1 Basin Description 4.2 Principal Flood Problems 4.3 Non -Levee Flood Protection Measures 4.4 Levees SECTION 5.0 — ENGINEERING METHODS 5.1 Hydrologic Analyses 5.2 Hydraulic Analyses 5.3 Coastal Analyses 5.3.1 Total Stillwater Elevations 5.3.2 Waves 5.3.3 Coastal Erosion 5.3.4 Wave Hazard Analyses 5.4 Alluvial Fan Analyses SECTION 6.0 — MAPPING METHODS 6.1 Vertical and Horizontal Control 6.2 Base Map 6.3 Floodplain and Floodway Delineation 1 1 2 2 13 23 23 33 34 35 35 35 35 35 35 35 35 36 36 37 38 38 38 39 56 57 57 57 57 58 58 58 58 69 69 TABLE OF CONTENTS (CONTINUED) Volume 1 (Continued) Figures Page Figure 1: FIRM Index 14 Figure 2: FIRM Notes to Users 17 Figure 3: Map Legend for FIRM 20 Figure 4: Floodway Schematic 34 Figure 5: Wave Runup Transect Schematic 35 Figure 6: Coastal Transect Schematic 35 Figure 7: Frequency Discharge -Drainage Area Curves 45 Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 57 Figure 9: Transect Location Map 58 Tables Page Table 1: Listing of NFIP Jurisdictions Table 2: Flooding Sources Included in this FIS Report Table 3: Flood Zone Designations by Community Table 4: Basin Characteristics Table 5: Principal Flood Problems Table 6: Historic Flooding Elevations Table 7: Dams and Other Flood Hazard Reduction Measures Table 8: Levees Systems Table 9: Summary of Discharges Table 10: Summary of Non -Coastal Stillwater Elevations Table 11: Stream Gage Information used to Determine Discharges Table 12: Summary of Hydrologic and Hydraulic Analyses Table 13: Roughness Coefficients Table 14: Summary of Coastal Analyses Table 15: Tide Gage Analysis Specifics Table 16: Coastal Transect Parameters Table 17: Summary of Alluvial Fan Analyses Table 18: Results of Alluvial Fan Analyses Table 19: Countywide Vertical Datum Conversion Table 20: Stream -Based Vertical Datum Conversion Table 21: Base Map Sources Table 22: Summary of Topographic Elevation Data used in Mapping Table 23: Floodway Data ii 3 25 36 37 37 38 38 38 40 56 56 58 66 66 66 67 67 67 68 68 69 71 72 TABLE OF CONTENTS (Continued) Volume 2 Page 6.4 Coastal Flood Hazard Mapping 6.5 FIRM Revisions 6.5.1 Letters of Map Amendment 6.5.2 Letters of Map Revision Based on Fill 6.5.3 Letters of Map Revision 6.5.4 Physical Map Revisions 6.5.5 Contracted Restudies 6.5.6 Community Map History 120 120 120 121 121 122 122 123 SECTION 7.0 — CONTRACTED STUDIES AND COMMUNITY COORDINATION 125 7.1 Contracted Studies 125 7.2 Community Meetings 127 SECTION 8.0 - ADDITIONAL INFORMATION 129 SECTION 9.0 - BIBLIOGRAPHY AND REFERENCES 131 Tables Page Table 23: Floodway Data (Continued) 93 Table 24: Flood Hazard and Non -Encroachment Data for Selected Streams 120 Table 25: Summary of Coastal Transect Mapping Considerations 120 Table 26: Incorporated Letters of Map Change 121 Table 27: Community Map History 124 Table 28: Summary of Contracted Studies Included in this FIS Report 125 Table 29: Community Meetings 128 Table 30: Map Repositories 128 Table 31: Additional Information 131 Table 32: Bibliography and References 132 iii TABLE OF CONTENTS (Continued) Volume 2 (Continued) Exhibits Flood Profiles Ashcroft Draw Big Thompson River Big Thompson River — CR 13 Split Boulder Creek Cache La Poudre River Cache La Poudre River - 35th Avenue to 25th Avenue Pits SFP Volume 3 Exhibits Panel 01P -07P 08P-18(b)P 19P 20P -25P 26-46(c)P 46(d) P Flood Profiles Panel Cache La Poudre River - Downstream of 83rd Avenue 46(e)P Pits SFP Cache La Poudre River - Habitat Lake SFP 46(f)P Cache La Poudre River - Kodak SFP 46(g)P Cache La Poudre River - North Island Grove Park SFP 46(h)P Cache La Poudre River - North of 8th Street SFP 46(i)P-46(j)P Cache La Poudre River - Over 83rd Avenue SFP 46(k)P-46(m)P Cache La Poudre River - Railroad to 35th Avenue Pits 46(n)P SFP Cache La Poudre River - South Island Grove Park SFP 46(o)P Cache La Poudre River - State Highway 392 SFP 46(p)P-46(q)P Cache La Poudre River - Upstream of 83rd Avenue Pits 46(r)P SFP Cache La Poudre River - Upstream of Railroad SFP 46(s)P-46(u)P Cache La Poudre River - Varra Pits SFP 46(v)P Cache La Poudre River - Waste Water Treatment Plant 47P SFP Cache La Poudre River - Water Valley SFP 48P -49P Coalbank Creek 50P -52P Consolidated John Law Ditch 53P iv TABLE OF CONTENTS (Continued) Volume 3 (Continued) Flood Profiles Panel Dry Creek No. 2 53(a)P Eaton Draw 54-57P Eaton Draw Split Flow 57(a)P Greeley Canal No. 2 58P John Law Ditch 59P -61P John Law Ditch — CO and Southern RR Flow Path 62P John Law Ditch — FR Energy Flow Path 63P John Law Ditch — FRE SE Flow Path 64P John Law Ditch — FRE SW Flow Path 65P John Law Ditch — GWD Flow Path 66P John Law Ditch — Kodak L Path 67P -68P John Law Ditch — Kodak Road Split Flow 69P John Law Ditch — Railroad Flow Path 70P John Law Ditch — WCR 23 Flow Path 71 P John Law Ditch — WCR 23 Lower Flow Path 72P John Law Ditch — West Tributary 73P John Law Ditch — Whitney Flow Path 74P Little Thompson River 75P-79(j)P Little Thompson River Railroad Split 79(k)P Little Thompson River Schaal Split 79(I)P Little Thompson River SH60 Split 79(m)P Pumpkin Ridge Split Flow Path 80P St. Vrain Creek 81P-86(i)P v TABLE OF CONTENTS (Continued) Volume 4 Exhibits St. Vrain Creek — Existing Lakes 87P St. Vrain Creek — Sandstone Split 87(a)P-87(b)P Sheep Draw 88P -96P South Platte River 97P-118(j)P South Platte River Breach 118(k)P South Platte River Spill 118(I)P Spring Creek 119P Spring Creek Overflow 120P Spring Creek Tributary 121 P -122P The Slough 123P -124P The Slough — Below John Law Ditch Reservoir 125P -126P The Slough Split 1 — Below John Law Ditch Reservoir 127P Tri-Area Drainageway 128P -134P US Highway 34 Bypass Split Flowpath 135P Western Flow Path to Spring Creek Tributary 136P Published Separately Flood Insurance Rate Map (FIRM) vi 4,735 4,730 4,725 4,720 00 m z 4,715 I- w w U. z 0 a 4,710 w J w 4,705 4,700 4,695 1&J EE LLl a: ❑ 0 a. LU I C.) 0 w. w J U- z O U w ar a a a. ROM CACHE DIVERGENCE FLOODING EFFECTS FROM CACHE LA POUDRE RIVER N 4,690 _ 0 /Is. LEGEND 0.2% ANNUAL CHANCE FLOOD "1%4." ANNUAL CHANCE FLOOD' 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,735 4,730 4,725 4,720 4,715 4,710 4,705 4,700 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 co W J_ LL O I_ O O J LL CACHE LA POUDRE RIVER - DOWNSTREAM OF 83RD AVENUE PITS SFP FEDERAL EMERGENCY MANAGEMENT AGENCY O O F -- z O 0 J W AND INCORPORATED AREAS STREAM DISTANCE IN FEETABOVE CONFLIENCE WITH CACHE LA POUDRE RIVER 46(e)P d Tun 4,790 E RIVER O1 CD 01 o 01C FLOOD PROFILES 4,785 C} -€E LA POLO - 4,780 IJENCE WITH C 4,775 Eii 0 z CONFL • 4,770 III w LI- FLOODING EFFECTS FROM hid CACHE LA POUDRE RIVER z 0 • Q 4,765 w J LLJ 1 �- 4,760 - - - - rrr 4,755 -- LEGEND CHANCE FLOOD =EDERAL EMERGENCY MANAI WELD COUNT AND INCORPORATE 0.2% ANNUAL - • • - • . - • - - • • - '1%+' ANNUAL CHANCE FLOOD' - - 1%ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD 4,750 - - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD A E - - - WSTREAM BED CROSS SECTION LOCATION CI • DATA NOT AVAILABLE - 4,745 - 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(f)P 4,765 4,760 4,755 4,750 z 4,745 I- w w LL 2 z 0 4,740 w J w 4,735 4,730 4,725 LU w FLOODING EFFECTS FROM CACHE LA POUDRE RIVER r �r 4,720 _ 0 400 800 1,200 1,600 2,000 2,400 2,800 3,200 3,600 LEGEND 0.2% ANNUAL CHANCE FLOOD • -' - "1%+" ANNUAL CHANCE FLOOD` 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - • - 4%ANNUAL CHANCE FLOOD 10%ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION ' DATA MOT AVAILABLE 4,000 4,400 4,800 4,765 4,760 4,755 4,750 4,745 4,740 4,735 4,730 5,200 FLOOD PROFILES CACHE LA POUDRE RIVER - KODAK SFP FEDERAL EMERGENCY MANAGEMENT AGENCY 0 0 z 0 0 J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(g)P .4 675 1 I d I 4,675 , ice III n — LLED BY • • • • •I a) 0) -O) rn a) i O (Ti O (Ti a i FLOOD PROFILES 4,670 F[E LA POUDRE t HE LA POLIDR OVE PARK SF POINT CONTR I E RIVER 4,665 JCE WETH CAC ICE WITH CA TH ISLAND G REAM OF THi CHE LA POUR 4,660 00 CI w J LL a 1% ANNUAL CHANCE BACKWATER EFFECTS CONFLLJ SO LVATIONS UPS C z 4,655 III Z Z FROM CAC•-tE-LAPOUDRE - - RIVER - . . .. r _..---------------- O- { - 4,650 � r 4,645 r- fr _1 4,640 LEGEND ANNUAL CHANCE FLOOD =EDERAL EMERGENCY MANA WELD COUN1 AND INCORPORATE 0.2% - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD' - - CHANCE FLOOD 1% ANNUAL . 2% ANNUAL CHANCE FLOOD 4,635 - - ' - ' - 4%ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD A h - - of STREAM BED CROSS SECTION LOCATION Ci • DATANOTAVAILABLE - - 4,630 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(h)P a non , FLOOD PROFILES CACHE LA POUDRE RIVER - NORTH OF 8TH STREET SFP ELEVATION IN FEET (NAVD88) rn 0) rn rn c o N.Ni wo wcri G) -c A CONFLUENCE WI H CACHE LA POUDRE RIVER f- \ a ID m \\, ti cra 4,650 --- — - 4,645 4,640 FROM CACHE LA POUDRE RIVER 4,635 _ - - _ f 4 4,630 4,625 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,620 4,615 LEGEND 0.2% ANNUAL CHANCE FLOOD - . • - • . - • • - • • - "1%+' ANNUAL CHANCE FLOOD` - - 1% ANNUAL CHANCE FLOOD 4,610 2% ANNUAL CHANCE FLOOD - • - - • - 4%ANNUAL CHANCE FLOOD '! - 10% ANNUAL CHANCE FLOOD n - B � 7.+.,~e," STREAM BED r p CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,605 0 400 800 1,200 1,600 2,000 2,400 2,800 3,200 3,600 4,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 4,400 4,800 5,200 46(i)P .a RAS I 0_ I 4,665 - - con uuii a)i C) cri o 01 o c FLOOD PROFILES 4,660 - 4,655 4,650 CO in -- 4,645 I - w w z z 0 4,640 w --� w �, — -- -- _' —_ _—, . 4,635 Y -�- -_ 4,630 LEGEND 0 2% ANNUAL CHANCE FLOOD FEDERAL EMERGENCY MANAI WELD COUN1 AND INCORPORATE -••-•--••-••- '1%+" ANNUAL CHANCE FLOOD* 1% ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD 4,625 - - • - - • - 4% ANNUAL CHANCE FLOOD - •• • 10% ANNUAL CHANCE FLOOD - - - ��,n, STREAM BED C) CROSS SECTION LOCATION `DATA NOT AVAILABLE 4,620 5,200 5,600 6,000 6,400 6,800 7,200 7,600 8,000 8,400 8,800 9,200 9,600 10,000 10,400 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(j)P c co z 4,795 I- w w U - z_ z O a 4,7'10 w J W LEGEND 0.2% ANNUAL CHANCE FLOOD - • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOO' - - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - ' - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD 4 STREAM BED CROSS SECTION LOCATION DATA MN -AVAILABLE 0) W J FLOOD PROF CACHE LA POUDRE RIVER - OVER 83RD AVENUE SFP FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U z 0 O J W AND INCORPORATED AREAS STREAM DISTANCE IN FEETABOVE CONFLIENCE WITH CACHE LA POUDRE RIVER 46(k)P 4.735 4,735 - N N co o cra 0 LT.0 c FLOOD PROFILES CACHE LA POUDRE RIVER — OVER 83RD AVENUE SFP 4,730 - I 4,725 - 4,720 --- --� r ___r' 4,715 -.. _ �� r W ~ lz �- .r_�� z0 r� -- - 4,710 w J w 0 (7' =EDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,705 4,700 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • - - "1%+" ANNUAL CHANCE FLOOD* - - 1% ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD - ! - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD "rye STREAM BED C CROSS SECTION LOCATION " DATA NOT AVAILABLE - - - - - 4,695 4,690 - 2,600 2,800 3,000 3,200 3,400 3,600 3,800 4,000 4,200 4,400 4,600 4,800 5,000 5,200 STREAM DISTANCE IN FEET ABOVE CONFLIENCE WITH CACHE LA POUDRE RIVER 46(I)P 4,735 FLOOD PROFILES CACHE LA POUDRE RIVER - OVER 83RD AVENUE SFP ix i c w 4,735 ❑ 4,730 n M CACHE LA P 4,730 4,725 ERGENCE FR 4,725 4,720 4,720 co ❑ — ' L-- z 4,715 4,715 w w w z z O a 4,710 4,710 w J w 4,705 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,705 4,700 - 4,700 LEGEND ' - - 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD' FLOOD - - 1% ANNUAL CHANCE 4,695 f] J 2% ANNUAL CHANCE - - ' - - ' - 4% ANNUAL CHANCE FLOOD FLOOD - - 10% ANNUAL CHANCE FLOOD - - - .fw, STREAM BED 0 CROSS SECTION LOCATION • DATA NOTAVAPLA LE 4,690 5,200 5,400 5,600 5,800 6,000 6,200 6,400 6,600 6,800 7,000 7,200 7,400 7,600 7,800 STREAM DISTANCE IN FEET ABOVE CONFLIENCE WITH CACHE LA POUDRE RIVER 46(m)P 4,730 — 4,730 FLOOD PROFILES CACHE LA POUDRE RIVER - RAILROAD TO 35TH AVENUE PITS SFP 4,720 RE RIVER 4,720 4,710 'ACHE LA POLE: 4,710 4,700 L1ENCE WITH 4 4,700 iro— co z 4,690 z 0 ca 4,690 H w FLOODING EFFECTS FROM - CACHE ,.A POUDRE RIVER u_ z z 0 4 11,- 4,680 4,680 _ — _ Ili FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,670 �`�G 4,670 4,660 ICI : - 4,660 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD` 1% ANNUAL CHANCE FLOOD C0 4,65 2% ANNUAL CHANCE FLOOD - - - — — - — — • — 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD . - - 4, , ! STREAM BED A CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,640 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE 46(n)P 4,675 4,670 4,665 4,660 07 co z 4,655 I — w LL 4,650 4,645 4,640 C 4,635 ' 4,675 FLOOD PROFILES CACHE LA POUDRE RIVER - SOUTH ISLAND GROVE PARK SFP OUDRE RIVE ARK SFP 4,670 ITH CACHE LA LAND GROVE 4,665 ONFLUENCE NORTH I 4,660 U FLOODING EFFECTS FROM NORTH ISLAND CACH: GROVE H LA POUDRQ PARK SFP RIVER - 4,655 L 4,650 �rW � f rr Yr� 4,645 4,640 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS _ LEGEND CHANCE FLOOD CHANCE FLOOD* FLOOD FLOOD FLOOD FLOOD LOCATION E -••-••-••-••- 0.2% ANNUAL "1%+" ANNUAL 1% ANNUAL CHANCE - 2% ANNUAL CHANCE - - • - - • - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE fl\/C\ STREAM BED CROSS SECTION • O.TANOT A A!lMJ 4,630 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER - NORTH ISLAND GROVE PARK SFP 46(o)P 4,815 4,815 FLOOD PROFILES CACHE LA POUDRE RIVER - STATE HIGHWAY 392 SFP 4,810 UDRE RIVER AHVON 4,810 4,805 fH CACHE LA P D COUNTY BOIL - ---- - - - - -4,805 4,800 NFLUENCE W1" RIMER - WEL 4,800 a 4,795 4,795 ? Lu FLOODING EFFECTS FROM CACHE LA POUDRE RIVERLii . z 4,790 4,790 w w / i �i FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,785 err 4,785 - ti 4,780 - - 4 4,780 _ LEGEND 02% ANNUAL CHANCE FLOOD - • • - ' • - .. - -- .•- "1%+" ANNUAL CHANCE FLOOD' - - 1% ANNUAL CHANCE FLOOD 4,775 _ 2% ANNUAL CHANCE FLOOD - - ' - - ' - 4% ANNUAL CHANCE FLOOD - - 1O ANNUAL CHANCE FLOOD - - - - - - - w, STREAM BED 0 CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,770 0 400 800 1,200 1,600 2,000 2,400 2,800 3,200 3,600 4,000 4,400 4,800 5,200 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(p)P 4,820 4,815 4,810 4,805 0-3 CO > 4,800 w w LL. z z O i= 4,795 W Lu 4,790 4,785 4,780 — 4,820 FLOOD PROFILES CACHE LA POUDRE RIVER - STATE HIGHWAY 392 SFP pUNDARY 4,815 LCOUN TY B LARIMER , WI . . 4,810 4,805 4,800 —r ----- -- f !.{f 4,795 4,790 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS , -te - - — — 4,785 i _ _ _ _ _ LEGEND FLOOD CHANCE FLOOD' FLOOD FLOOD FLOOD FLOOD LOCATION 0.2% ANNUAL CHANCE -••-••-••-••- "1%+" ANNUAL - - 1% ANNUAL CHANCE 2%ANNUAL CHANCE - - - - - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE ow,wt,STREAM BED CROSS SECTION DATA HOT AVAILABLE 4,775 4,600 5,000 5,400 5,800 6,200 6,600 7,000 7,400 7,800 8,200 8,600 9,000 9,400 9,800 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(q)P 0 co o > I- LU w w z z 7 w -I LU 4,750 4,745 4,740 4,735 4,730 4,725 4,720 4,715 4,710 4,705 0 4,750 4,745 4,740 4,735 4,730 4,725 4,720 FLOOD PROFILES CACHE LA POUDRE RIVER- UPSTREAM OF 83RD AVENUE PITS SFP x LU R w ❑ CACHE LA POI FlUENICE WITH -- -- z 0 O FLOODING EF LA PO ECTS FROM ERE RIVER CACHE FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,715 / r - - LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD` FLOOD FLOOD FLOOD FLOOD LOCATION - • • -' • - •' - • • - "1%+" ANNUAL - 1% ANNUAL CHANCE - - -- - ' 2% ANNUAL CHANCE - - ' - 4% ANNUAL CHANCE - 10% ANNUAL CHANCE l\ STREAM BED CROSS SECTION �.J • DATA NOT AVAILABLE 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 5,500 6,000 6,500 46(r)P 4,690 FLOOD PROFILES CACHE LA POUDRE RIVER - UPSTREAM OF RAILROA❑ SFP 4,685 IY w w ' I 4,690 4,680 J LiJ C - — 4,685 4,675 w U W IL 4,680 07 00 o O v FLOODING EFFECTS FROM CACHE LA POUDRE RIVER 4,675 z 4,670 --- - W .0-0. 4 670 w LL j4,665 4,665 w- ' r rr - - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS ��.'f 4,660 4,660 4,655 4,655 LEGEND 0.2% ANNUAL CHANCE FLOOD -`•-•`-••-••- "1%+" ANNUAL CHANCE FLOOD* - 1% ANNUAL CHANCE FLOOD 4,650 2% ANNUAL CHANCE FLOOD - - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD - - - - - f�'�~ STREAM BED CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,645 0 500 1,000 1,500 2,000 2,500 3,000 3,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 4,000 WITH CACHE 4,500 LA POUDRE RIVER 5,000 5,500 6,000 6,500 46(s)P d Anti a LL 4,695 ]li‘l 1. i \ • hA -a.L� A a c c.r, CO Vii CO E FLOOD PROFILES 4,690 4,685 I 4,680 - co z 4,675 - - -- { LU Z r - r r f F., 4,670 a }! LU f 4,665 1 - 4,660 LEGEND 0.2% ANNUAL CHANCE FLOOD =EDERAL EMERGENCY MANA' WELD COUN1 AND INCORPORATE -••-••-••-••- "1%+"ANNUAL CHANCE FLOOD' - - 1% ANNUAL CHANCE FLOOD FLOOD - 2% ANNUAL CHANCE 4,655 - ^ ' - - - - 4%ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD ��/�‘" STREAM BED O CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,650 _._ 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 13,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(t)P 4,710 — FLOOD PROFILES CACHE LA POUDRE RIVER - UPSTREAM OF RAILROAD SFP 4,705 ce w w n. I 4,710 4,700 4,705 4,695 4,700 63 4,695 z 4,690 w w w z z 4,690 O 4,685 • w 4,680 / rry f NO E TH in 4%,.AND 2% ANNUAL CHANCE . 4,685 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS t� FLOOD ANNUAL PROFILES CHANCE . . SHOWN ARE TOO CLOSE FLOOD ELEVATION .SEPARATELY TO THE 1% TO BE 4,680 f 4,675 , 4,675 LEGEND - - - - 0.2% ANNUAL CHANCE FLOOD - •' - " - • • � • • - "1%+" ANNUAL CHANCE FLOOD' - - 1% ANNUAL CHANCE FLOOD 4,670 2%ANNUAL CHANCE FLOOD - - - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD ..grw\- STREAM BED p j CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,665 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 17,500 18,000 18,500 19,000 19,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(u)P a BFD 4,650 ce w -- co ry us O1 O1 0 ur c i i FLOOD PROFILES 4,645 X a M O a DI CONTROLLE IVER 4,640 NCE WITH CA OF THIS POIN LA POUDRE 4,635 0 CONFLU VS UPSTREAlv CACHI ? 4,630 I — W Li; IL FLOODING -• POUDRE - ELEVAT1 Z Z O — r W4,625-iiii W_.r.. ---- . IIIIIMMEM -- 4,620 7,,T,, r4 gre", . +ff v//ti D 4,615 LEGEND 0.2% ANNUAL CHANCE FLOOD t 'EDERAL EMERGENCY MANA+ WELD COUN1 AND INCORPORATE - • • - • • - • • - • • - "1%*" ANNUAL CHANCE FLOOD' - - 1%ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4,610 F - - - - - - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD . - e STREAM BED CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,605 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 46(v)P 4,765 -- FLOOD PROFILES CACHE LA POUDRE RIVER - WASTE WATER TREATMENT PLANT SFP 4,760 ec I F 4,765 4,760 4,755 NFLUENCE VN/ E LA POUDRE !VTROL LED BY 4,755 4,750 O a c 'HIS POINT CO rt w Ea w ce FLOODING EFFECTS =ROM CAC E LA POUDRE RIVER PSTREAM OF CACHE LA POI, 4,750 63 co o 4,745 mo. H - 4,745 z I- - w w - - 1rl LEVATION z _ -, z -- - .- O - a 4,740 > J w — ,____ . ____�--------------- ---� -------- `• _� . - - - - 4,740 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,735 4,735 4,730 4,730 LEGEND - 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD` ^ 1% ANNUAL CHANCE FLOOD 4,725 -- 2% ANNUAL CHANCE FLOOD - - - - - - - - - - - - - - - - - • - - • - 4%ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD _ I / v", STREAM BED A CROSS SECTION LOCATION ' DATA NOT AVAILABLE 4,720 - 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 47P 4,775 4,775 FLOOD PROFILES CACHE LA POUDRE RIVER - WATER VALLEY SFP 4,770 rE RIVER 4,770 4,765 H CACHE LA P 4,765 7NELUENCE WIl —14,760 4,760 c, FLOODING EFFECTS F OM CACHE P0UDRE RIVER - --`_ - o _A , - - �. - z4,755ui 4,755 W IL Y f �� - 4,750 W J W � rr Yl r rr ---- • - _- 4� 4,750 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,745 4,745 4,740 IC 4 4,740 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-. - ^1%+^ANNUAL CHANCE FLOOD` - - 1%ANNUAL CHANCE FLOOD 4,735 2% ANNUAL CHANCE FLOOD - --- • - - . - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD - - \\/A/ - - - - - - - - (w" STREAM BED C) CROSS SECTION LOCATION ' OATA NOT AVAILABLE 4,730 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 48P 4,785 4,780 4,775 4,770 14,765 z z a 4,760 W J 4,755 4,750 4,745 4,740 6,500 - 4,785 FLOOD PROFILES CACHE LA POUDRE RIVER - WATER VALLEY SFP UDRE RIVER 4,780 M CACHE LA P 4,775 ERGENCE FRC 4,770 _ 4,765 - 4,760 / / I{ / - // !rte 4,755 ff / / / -- --_--T____________________________________ - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,750 - - LEGEND 4,2% ANNUAL CHANCE FLOOD CHANCE FLOOD' FLOOD FLOOD FLOOD FLOOD LOCATION - - -' - -' - - . ,'--• "1%+" ANNUAL 1% ANNUAL CHANCE 2% ANNUAL CHANCE • - 4% ANNUAL CHANCE -• 10% ANNUAL CHANCE - - • - - - ;~\\..44 - STREAM BED CI CROSS SECTION ' DATA NOTAYAILABLE 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 13,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 49P ELEVATION IN FEET (NAVD) 4725 4720 4715 4710 4705 4700 4695 4690 4685 4680 U 1% PA NTH ANNUAL CHA CE A<WATFR FFF, ,TS FRnM CACHE LA PO EIRE RIVER A r • r i f 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD hVl \ViksY" STREAM BED CROSS SECTION LOCATION 5,000 5,500 6,000 4725 4720 4715 4710 4705 4700 4695 4690 6,500 FLOOD PROFILES COALBANK CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 50P ELEVATION IN FEET (NAVD) 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 4750 4745 4740 4735 4730 4725 4720 13,000 FLOOD PROFILES COALBANK CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 51P ELEVATION IN FEET (NAV0) 4755 4750 4745 (13 0 i 13,500 14,000 14,500 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD KY".~- STREAM BED CROSS SECTION LOCATION 13,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 4755 4750 AT AC FLOOD PROFILES COALBANK CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 52P ELEVATION IN FEET (NAVD) 4785 4780 4775 4770 .L . 0 500 1,000 1,500 2,000 2,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH LEGEND 1% ANNUAL CHANCE FLOOD A`. STREAM BED CROSS SECTION LOCATION 4785 4780 4775 FLOOD PROFILES CONSOLIDATED JOHN LAW DITCH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 53P 4,920 - 4,920 FLOOD PROFILES DRY CREEK NO. 2 4,915 1% FROM ❑ jam FLOODING I CONTROLLED ANNUAL CHANCE ST. VRAIN CREEK . - ... --Wi BACKWATER O rr -• 4,915 4,910 BY ST, VRAIN CREEK PRIVATE DRIVE ACCESS ROA FOOTBRIDGE RIVATE DRIV UNTY LIVE RO IVELD/BOULDE COUNTY LINE 4,910 4,905 VRAIN CREEK • - U -- 4,905 =NCE WITH ST. 1. . F....4,900 �.�- 4,900 I - w W LL Z 4,895 CCNFLUI �� y r 4,895 w W �l rf ,ter FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AN❑ INCORPORATED AREAS 4,890 4,890 ------------- i 4,885 `� 4 4,885 _��- LEGEND CHANCE FLOOD 0.2% ANNUAL - • --••----•-- "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,880 - 2% ANNUAL CHANCE FLOOD - - • - - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD - f�,ww". STREAM BED y } CROSS SECTION LOCATION �� 4,875 0 500 1,000 1,500 2,000 2,500 STREAM DISTANCE 3,000 IN FEET ABOVE 3,500 CONFLUENCE 4,000 WITH ST. 4,500 VRAIN CREEK 5,000 5,500 6,000 6,500 53(a)P 4680 4675 4670 4665 4660 I - w U- 0 4655 W J W 4650 4645 4640 4635 0 �. o1A MAr ! l I ' I E � i ; { __ f • iliF•(� R F�� ....IiiilI�.I_�Jr.. .__ I 1 11 L T _ -1 al N. 1 1 I i- .i1 g ll I i 4 7 II II Milli I" !NNill -�� .- ._I7 hil :: : N: ppi#un, . ;1 I iII i :I N! __ !PI.!N ■IiNaINI ! if . ,ii 1 _'-� �!N! 1 - -, 1� � : i I . i I N�lNIN ! II .. �III.1 ....... ....;_,. ONN IN�! f iiiiiiPM111 :ONI■Nl•N:::Qim11U -INN,'-' Bird' NNII homasim I 1 11_ : N °i1i- I_-aaNlN --I1mmiIIIIIimIIillpii i --..iii .�.. 1 _-I_.N! N :o#m�:1i �.oe� Mil' -!i l:1 _�- L :- �_:. ■■ 11111111Midili I.li■■■■! IC.■:: N■■. IIIIKILI. .....r. bums ,- :u■■ !I E'L!IHU!- !Al EF- ..--L: I_!L.....-LEIOuIi iH!HIU!!U1- ir 9 II i mul141PP!W!IIIIIHIUIHHI.:r IEP!1!Eij liMilllihnni-FL !I IIIIIII6FAIIIIIR. h Idipol„Ohilikliii11110111 NI ININ1■11NE■�NNl1ilII:■ : 11 lNaNE a a aNNN �_.._.:L!1N111 ! ! -!11111711!" •• M m Nol! I �,.■1 ! - ;.� 8 !i I_ _NII m: rr iiii! .INii!!!!■ ■n■IIPIMPIE!"___■■�.�.,G� rNNN! p:N1a�_ u ■ ■■ ■■■n !i I . _■■■.■■ cd■-••._.■■i■ ,I lilli I �IINIII " -�� rlilliiiiiiiilliiiiiiiiiiiiiii Mil„ BaIdiaaNiNlN N iIILI=. _ _��W..� a�.I �-1--_ ._ .. _.. I 111Milk �In■�ic Ji■■ u lN.....■al! NN..Nla I �. � .-�... r- .uu• I i,: ! !!■ .! - NN I ! 1 1 I ., ! ! !!i1: 1 ■ _ �__ ■a Mill -I Ill N!■I .i■. &e� 11. b ,�i i .IN■■ .1111 Ii.NIi! IiiNN ::1 I IN I I N ! ■.�..i,■■t■ ■■.nln.■■IIIIIIIIN I III■'C,■.. ■■■.■..■■■!:j1Hdi0m1 *r. ■■.�I■■ll.ELI. ■..i■1■! TjLpjFiL :: . : NN I: 0: E L;� i ; n■ L_� 0.2% ANNUAL CHANCE FLOOD __ __ I ■ ■_ _ -�__ 1% ANNUAL CHANCE FLOOD tehliiiiird �_ _ I I_ �_.L !NN!! !!N imN! l . NIIh.IIN:N■ 2% ANNUAL CHANCE FLOOD ' � � 90%ANNUAL GRANGE FLOOD ' I a1NPIT asIMMEMIIIIIIIMPTIMPFPnq II.>�IIIN!!C NCN�NNN �. : �:Plinklailliglaillid : :■:■::■■■■■.;;::. ■ #UII 1 ! l�..I1 d ■ ■ .a a.■■lNN.g■N:N: as a = �: a ■n■■■■ ■■ ■ n■■■■■■■■■■■■■■n■■■■■■■■!!■■ ■■■■N•a ■ ..■■n ■ ■■■■■■N■■mm■■.■■■■n■■■■IINNINII. Ui■.n■■■■■■■■■■■■■■n■■■■■nn■■■.■.n■■■•G■1■■n■■■ 6 STREAM BED CROSS SECTION LOCATION 500 1,000 1,500 2,000 2,500 3,000 3,500 3,500 4,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 4,500 5,000 5,500 4695 4690 4685 4680 4675 4670 4665 4660 6,000 w u_ ce 0_ 0 U - FETE' L EME'GENCY M N 1 GEMENT GENCY WELD COUNTY CO WA ri]►I C]:7s\►i►I AND INCORPORATED AREAS 54P 4715 473a FLOOD PROFILES EATON DRAW 4710 ��- I ' i r I !._ I I _i _-:_ _,_ li .;---- -� -1 I i I ! ._,.-._1 I I i I I I. . . I I I I 1 I � I-- ? .. 1' I I ..:. I .. . ...I .. I I . :. I I I I I I I ; I I• I I 1 ` C I '. i I r. � 111 I I _. I •I. I I - -1 I• r I I _.._I I - � I -I , , • i -.,_. I _ i I. ..:II I 4725 J- i i !�j ! -- _ _ H I. I I.! — .I If I II I7_7 !I ;I . ! Ii III . __ I I i - i i 1 i III I I 1 I .II ! ! 1 I 1-f i .� i I � !Il: HI I I l l i i II1.ili I 11! I..ii: ! ... I I .I .... 1. i I..,.1 ..,1 Ili !I I . 1 --1 I is ii I , I. . 4705 . I .. :: 1i I Ij I`_i I 47(a 4720 I .. : • •1 i I 1:_I . � 4720 4700 - . I �- .. .. ... .. :_ I i I II II I II f . II i II ! ••—-i— •iiI I . .. !.II I I i, I 1 I! I I � I,:! ! : i °—r.— ! `: ^_--_r I I— I - ! ... — iI III-- I -I — I_ - - — _ ' 'l1. 1! I. - ! - .— —- '_ l_! !I I I I �.. 1 i : i - . - . --I .._ j— .I.i I 1-.I i I i.. 1 : - I 1 ; 1 I j : I I I, „ I I.. I - r T I . ' i 'I I ,-. ! I i I !..._ : - r l_ 1 . i I ' ! 1 I i . i I • { I I !I • I. ••1-----17-7-j —I L. -.I_ _ . IIi• I I ! I 4715 Z 4695 I --II I _ � --- FT Ali! iii.i l l .. — i� _rl � I--- I I I, I I .__�•I • �._ I r •Q 111 �' I ..__. I I.. 11 ,I• I -I L I -I I� 'JJ I •i ---.!_ I -I i L 1• 1-7 „i I !• r f I j i. _ I I � i 1 ---.� - 11 1.-1',-.. _ Ij i— I I I III — i II —' — If '' 4710 Z _ I— 0 - I r ` I I I i I •!-.r I • i II it I il �! Ii � i I_—� -I I 1— I I I I l i 4705 ; : �..�Ii i 4685 . . - _ .... 1 I I `. ,._._.I ...• _! I I. !: : _.. ---.- _. � - --i1: . ,, I - . I. I .._ J_... I _ ;. . : _ .... 1=_. : -- I .iii:: — —� ._ I - �l �J - i,.' �111± .. . .- 1. I I. rl .. #1l I -. I I I i ! I� 1 : [ 4700 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATEID AREAS / __J __._- I_I - _ j I.. i ! i I i .__._ I 1 1 I I. _.L;_...I...�I—•— — III, - I I I_ IT _7 _ — --- ---- _r I Ii I [ —L__.._ I I1 .. I I I __ I "1 •• I I 1 I I r -I i 1 r I T� I 1 j` Il f' I I I I ! I I i ! I I 1 - I —'I i ! L1 -.l I 1 1— I T I _ I II j T r II ij IL, I I Al'ShOJ'.`1 •1680 '.rf1 *' HLi I [ .. — :. I i {i _� i1 `� •�-I 1 r1 LEGEND 0.2% ANNUAL CHANCE FLOOD —• I I I I l III _ - -! J__.._...... L L I. 1 I ..I I I I; �. i 1 I I - —I - 1.. i 1_ I .. I. • I 1 i, L _:J._L I — — I I I__._....� . -- —�— — — — — I -- 1--.• •{ {, {., 1% ANNUAL CHANCE FLOOD 4675 - • i I 1 r iI I I i : I LI I I —— 4690 j 2°k ANNUAL CHANCE FLOOD -_', i :- I. I I i :^ IH I 1...- _. _ I -- _ -�-- _! --, -- — LLI I I _ LL T1 — — I —i I I _k — — — — 10% ANNUAL CHANCE FLOOD L—--.�..-- _' I ' •— . ��— !• i ! i 1 '— j . I — I : — ; L — 1___.1— I I .. _ —1--.i.:::_._ .i 1 I. . •. . I • i:. I _— .— • i , .......—.--.J — — I I — I i �! I' .• • -.:_ . — .L1_:—..__.�_._ .. I_,_ I I__ . ... .j... . I .. _i i 1.1-1 .I _E _. 7. •_ L I- _I I i 1 i r__ —j i . l ---r �.. .l I _I ,: . .....,,,y,..,,,,,,,,, STREAM BED CROSS SECTION LOCATION 4670 6,000 6,500 7,000 I 7,500 , - 8,000 STREAM DISTANCE 8,500 IN FEET I : 9,000 ABOVE , I 9,500 CONFLUENCE I WITH 10,000 CACHE LA POUDRE 10,000 RIVER 10,500 11,000 11,500 12,000 55P 4745 4745 FLOOD PROFILES EATON DRAW 474D `° j _ - 1 ____ �� l- i -I _ • P1 j I � j i LJ-f�l�; i I 1 �i ' :... I 11 I • a I: -I 1 I i -{- I ! I � -l._- _ LIH � 1 L LI __..'_ ' f 1 I i .. I I -- I I.-. - J Ir -- f�--• I I:: I :___..- I:I I.! 4740 4735 I ILL 1- li - i I iiI_! �•I - -- I 1I ..L.LII-I I I-- II - -- I ' I I 1 I • ,!.IL I'.. I I -- - I l —I -L -:.k C r I I i III! I I j I I I i •i, I. I II i I - I• 1 I, - ILL- � I i 1 I I� li I �. j —! I I I.. ::. I I I �:. I j I ,I :: II I! L !I IJI ! ! I I I I; II I i I i:i I i I, ;— i H — 1 —I-1 I' ! !: —I-1 I ! r 1 F 4730 . � I: . i J -� I :..I _ — _� ! J. _� r I J_..l I i JI i _,_, • : Ili 1 �-:-.1- �,_ -I --� i I_I_ _ I! � i—H-- { I• � I � HI ! 'f I �_ , , III i I I J i1 ! ! � I 11 I i . I. I I � _• _•L :_i__ �— —' . l I i. I i . r II ' — I I I . , _r_ {....... I I Ii i -:- • 1 _-_. i I 1C -- J I �_. ,' I • _ ! _ — � -� I _ _ i { _I ,II � • I I • f � �� _ .I .. ! 1_1._: I I. 14735 . ' = : I L . I I .1•I — — —i — C— 730 •!_ 11 I. LI J J — I I.I 1LLHH 4 z 4725 I• i ! l_— I I I I i 1 .., L_ _'I_ I i i_ — 1— i I I _1_ I ! ._ r _. I III II I. ,. 1 t f —T` Ii1 I isI I I I I I I .! C... I I. p ir-1 4720 7. l 1 I 1 .. L. 1 I I { I I .. _ I :.i I I— — - — ! rl— I i — — i . i1 ! I l._ I i• .I_ I 1r. ! I I —I . I ! r ! I 1 I I !'. I —!—! I— —: I _ _ r -- ._1_L —I — i— _ 1 = I ` _ 4725 720 J Lii I 1II I I II _I n—• I -- iI 1 1 - T T I _L I -ii• I.I 1- 4715 -,_.-i :. ! -L - i---I- _L--- _ l -I _E }i�h{11 _.J � ! .1.: r I i . I_..._i. . L_ f I I I I I ! • , I I . - 4715 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS tI _• 1. 1 j .Iii 1I I! :: I' I LI-H----, _..—i i i • f � I _ �. ----.i• _ ti�,4�rh�___I....- •�i1! rfi- �I ! � i I I� I I 11 �- -T ;. - - - 4710 I ._ I I I.I_ I I I I -i I I I i s I__ I I- 1-i 1 l- {` I i I H r _ 4710 Hrl ! LEGEND Ft1 ! r I I r_I 4- I I I _; r 0.2% ANNUAL CHANCE FLOOD -r _ --77-7:-•-••• ...�.., l 1 1 I II ^._. _. .' _ ,.,,., I II , I i - II --- I _ i • - i 1 i .. .. l - 1% ANNUAL CHANCE FLOOD 4705 _...,...1:1-1-1- I i i I - -°- - I . I I I I I 2% ANNUAL CHANCE FLOOD !f 1. 1 1 I_ I I L _: I I I II -I _ I 'I - - --10%ANNUAL CHANCE FLOOD = iI i! I 1 i I I i I I 111j:f I I II. 1 I1 I T:. 1..� !..1 r- - _ - I _ •- I ! i ! �i.I !. l -'1 C I f ! �!H /fit STREAM BED I -• •. 11 - I• 1 I I I -II-- I I � i i • i f i - : - �1IH 11 ^ • I 1 a• 4700 12,000 12,500 13,000 13,500 14,000 14,500 15,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 15,500 WITH CACHE 16,000 LA POUDRE 16,500 RIVER I 17,000 55P(a) ELEVATION IN FEET (NAVD) 4755 4750 4745 4740 4735 4730 4725 4720 4715 4710 17,000 I I 7- J III 11 I!l I l f — i r .l it j I Ii! ! 1<< . 1 •4 I I • i• .I. 1Hi!..1Il. !... ila1._ 1 )-_ I 1 1 I II1. 1 I. -' :. _ :.— .. r ` i r. - I • II_ I I.,I Ii - L: :. i : .lI I 1 1 i I "- . 1 .. I II I ,I! I .• . I : II I— l .- I k -_ .!_! I 1 1 I 1 I ,i!!l .:i� ___.al.. i:;-� - i �: _ I !_ I i_L i _I i ._....... - I-- 1_ I... ._ .. , I I— 1 I 1I ! 1 1.'`:I I i I'._!:•• 1. I. : I I I I _._i,. I ' I _ .! _ I. -i .. I 1 J. I.k I I . — .I.!....1. I I__ — .i .{ l . II f._ I 1 ... - I —I— _.. — 11 1. ! . 11 •1 _._ _: I I• ii ill I i eUNTY _ROAD �:_ _:- I I :. °_'__::..-w. I ." • 1 I I 1 1. i ¢ 11 au i! II . ! I i i i I i , 1._ I I , : ..i : ; ----I I i • 11 II 1...,. I 7--' I : 1 ...I. _ i' I I 11 •_L I I.. 1 1I I I - •I i l I..�. I i . I� I I— i .I _ I 1 I 1 {1 _i... •. k ...-�.._• 1.1 1 11 - t.i:.IiI.,. . 1 -' : 1 i i I .- ' -. .- I •...- II I 1 ;1 I 1 I i II I I I I I i I � I ' iI I I- i l :.: _.. J L_ I :: —._ I I I 1 17 1. �I —1 I I -I -. I ._ i L! ;. i — ' I I! ' I i_ I II . 1 i_ I t.. f 'I I! I. I• i i,I —.. •I :.. I fi I I r ! �� 1 l l i _ _ , i 1 1-ill I I I - l 1 L --. I I -,_ I . I I .. _ - I 1 I i — T r . • I I 1 I I 1 rr i 111 I E i .1 1 ..I I I 11,- _i 1_.. ••I- -It I i 1 — 1�- 1 i: IT i_! .. 1-- T I :I I-1 I I I I 1 Lj i I i i j I -_ I . I I r . . I - .I. I. _._ — r j i i •1_.I_. I I I: : I ..� ._ I I { 1. .. I '...I . 1 1 •I I I y- I L I_._ I —� I. -1--1 ' I' I.:. I 1 . _ I III- H I : I 1..1.. I — 1 �_.1.._ I i .. i i . I i I I i 1 L:. i lli J,• I TiT7IiTLI -f •• I IL� -•..: I I_• Il i I .._ C i = I I �_ I-- 1 1 I I f I I• I I I _ L I ! I. I L 4 - ! - I 1 • j - - k I . I I� _' , . I I _, 1---� I I - I_ - - I f _� L "—�—.I �-- __ _: _ I I _� _ _ _ i Ii -1 I—;— I'. L.. — I I '' �J l'... ' I r —I I •E :. I I I i ; _; LEGEND a CHANCE — : . . ..__ - I --- 1 I. I L I 0.2 h ANNUAL FLOOD — 1% ANNUAL CHANCE FLOOD I _ 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD J 1 L-- 'TEL 1 . UI I ' ... --1 I I 1 i i• _.{- _ _ --- I 1 ...:-• • 1 ! I - 1 : :. I — 1—— I 1- 1- —�_ — Er I i I { i _ I ...- --i _- -- _ I i I i I_I ... Cii Ill — . 1 I :I -1. fi I . I 1 1 I I I i I- j-- I I r i . i '-- _._7..-,_..1- k --+ j- - i 1 1 L -•CROSS -�_ - I_, I' 1 I. i. l k : : - 1. - _ .L.L_— I. -i 1 I i' }/h\`�G`�fit` STREAM SED SECTION LOCATION 17,500 18,000 18,500 19,000 19,500 20,000 20,500 21,000 21,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 22,000 22,500 23,000 755 750 745 4740 4735 4730 4725 4720 23,500 W J_ LL 0 0 a 0 LL EATON DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY U� >r Z LI O O 2 O ❑J z wo a 55P(b) ELEVATION IN FEET (NAVD) 4825 4820 4815 4810 4805 4800 4795 4790 4785 z 0 ,a•a Z rte,, . . . . . V . fI r • xr . r . • d o . :O s -r ..... • . ... . 4780 _ 0 I D O4.0 r„ 4,500 5,000 5,500 E 2 : ' 0 lei IL o z: �O d z Al AG I H LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 STREAM DISTANCE IN FEET ABOVE TOWN OF EATON CORPORATE LIMITS 6,000 4825 4820 4815 4810 4805 4800 4795 4790 6,500 FLOOD PROFILES EATON DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 56P ELEVATION IN FEET (NAVD) 4845 4840 4835 4830 4825 4820 4815 4810 • . 4860 4845 4855 4840 4850 /TT f i. � ry I ; f 4 F { F i : . - 1. • AK I • A AL 4835 4845 4830 4840 4825 4835 4820 4830 4815 4810 .... .H ...... u.) a • z AS LEGEND 0.2% ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD 1 V/ ` K, STREAM BED CROSS SECTION LOCATION 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,000 10,500 STREAM DISTANCE IN FEET ABOVE TOWN OF EATON CORPORATE LIMITS 11,000 11,500 4860 4855 4850 4845 4840 4835 4830 FLOOD PROFILES EATON DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREA 57P 4680 4680 FLOOD PROFILES EATON DRAW SPLIT FLOW 4675 i1 I T "• ` I I I I • iTI Ii I k ! 1i _ { J.. __ I_..� I 1 I I i I1! I, 1 I 1 �„ I� I! I 1 i iI ' I I f i — 11 1 I- Ii I _ 111 [ I I i !i 1 i I I ii' I :... I I — I ! iI I i ii I I., I I_..._ i_— rt i I •I I ::..L. I I • _ .— _ 4615 4610r FWENEE W E CA PQUDRE i _ I i ---- I I ! I _: �__ - ---_._.T . f I I . k I' I _.__....._.... : ;'i : r :: ---- I i , I k • . 1 1 -_i , i I 'P U7 : 1 cry •• •!m _._ 1 III i , w . __ i I i .. i I I _ I —._, , :... - , , - , I 1- . i ! - _ - I :: -- _ .T._ . ___ 4670 4665 —,.• I I ! 1 1 ! � : 1 _ i•• ! 1 I I• I : ` ' `1 I I•••• I I — _ `i I _.... I I -I- 4665 . , I L L .- I_ T_ •Q . ._ I I I I I I l 1 I �.•1 •Y`" i !I i I: I I I 1 j • I ' I C � i �. 1 I I . _,— I _.. l .r. _ . -- - 1 I i ] ! I r T Q I• I I r I I I i — ' ? 4660 > ; ! I I : ,• I 4660 _ �, 4655 i I ..: .. I � . , I I . � . _ . i . �r ... I i 11.....1 - ... _ I� , I 1 _ _ 1 J _- _ 1 �. ... - , -,- - ., I - I - -- I I I 4655 } w L.:_� I -- :.. _ I Li ! L L F I I I ; ' — 1 —i ' I -- -- I _ , I - --- - _ - ..... �- W I -_t- ! 1 I I- '-1 ; y Iit -` r i t- I I -I- - -- - I 1 1 I - t, - - - - - r _ ,- I r . _._ .. _ i .. I I. i I I ... i :1. I --- - - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4650 I • Hill . � � :. ;. I 1 I : I I _ � _. � " �' , - � ----- .rid--- I-- -i - � �- � _ . L .. ,�. i . I I I • • � • • ' i 4650 4645 JJ1 r I G- !- -_ fi .. I I I �r . . I r_ .:..L LIB I - �- - - I _- . I _ I I - , -; 1 I• i I . , �� I • --- --•- : - I, . 4645 I - i —, I I�__ .: Lr ! • LEGEND - I I ! I I _ ._ I .• F _ 0.2% ANNUAL CHANCE FLOOD ._.- l L -" - • • • 1 ' 1% ANNUAL CHANCE FLOOD - -,- - • 7 . -I . l- F ,. _._.__.._L. 2% ANNUAL CHANCE FLOOD 4640 _ . I I- I I , -I _i_. _ I _H_ f�� - . � I-- -. - I 0 1 1 1_ .+l --1-H I I I i _ - -- _ � _I.! I _ L L_ _ -- _� - ! , .._._ k I I , I I i I I I -[T i . •I -T�- _ _. _ .1L1 - - I .,. --- . , I • I 1 I 1 I i I , H. ----: _ - I -I __L . . I _ ` - 1 I _�--_ _ _ . I . . __ 'I . ,_ l k ! r . _ _ . I � _ _ _ I I r I I _� _ I I _ I I � C. - 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4635 ! , . 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 'DATA NOT AVAILABLE 57(a)P ELEVATION IN FEET (NAVD) 4795 4790 4785 4780 O Cn. La - J < CV O) c7 IHTH LEGEND 1% ANNUAL CHANCE FLOOD AYA.'"Oi/A' STREAM BED CROSS SECTION LOCATION 0 500 1,000 1,500 STREAM DISTANCE IN FEET ABOVE LIMIT OF DETAILED STUDY 4795 4790 4785 4760 FLOOD PROFILES GREELEY CANAL NO. 2 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 58P 4790 4785 4780 0 4775 w W u- 0 4770 4765 4760 �. iii J_ -.I,_ .LL , f _. -:.I_�. _. I . 1 I : I .1 i _ L ]....1-. I I I 1 11 I. • _ r... I . j !• _ . I ...T_ I I I :_ ._l__.._• -. i ::1.-.•_.!.._ I • ' i - _L• I •_1-._!_ i �- 1 • -� - - I t !____:_1 I _, . F_ , I I i . L ;_ l i j _ : I _. 1 . I _f_ _ L�_._i_ �,. I _r...-I--.�. •l I i I I 'III I. _ ? i _.._:. _I I i_ -_- i i_ _ I : .1..._.._. i -_ J _ . i -' - ' ! ., I I- L i --• . I I J I I -• 7. I . ... _ _i I 1 a _ u ai I aI F` T-- D •LL 1 TMAt+[-PARK DF I 1 1 I . I , . I I I I l i ... . I I I I i III; . . I i t . 1 I ] 1 •1' I I • "---i I I J I I� -- •i - i- ' I I �- I , .. . I I _• :._• I ._ -r._i : . J_. I I• :..,--I--; 1_..__1 • I I .a, • _: I _.J.._...., ,_I__ -1 I �- --; I ;-i . i i �U CE-DF,..JO EST•TR18L3TA I I --I-- i j 1. . I I ! -1 -r_. . I I I f I i_._ I! . I I 1II .- .__:.._ i_ i I : 1• .I • I i F. : Fes- I. I _11.1 . P4, i_ 2i 1 !_._._ I I ' •� , J IJ41I w I1 -� ' f i 11 I I�� I I 1 -._. : I I : --I- I 11 11• I 1•- I !_..: I I 1 1 1 11 : .l I •I ;.1 1 I i :. ' 11- I 1. I i .l..: 1 1. i I Ii I ..i I L I I t , ; :. 1 i 1 ! l i r -. I I I .---.__I_.-._ I .. I I I 1 - i -r ff --?.. 1 ,�> I i I L ! i I L I I. l I 11� _ I_ f._�_ I- I 1- I_ i-a �I- I 1 I- H .._ i L I I !_.. I I-�.-- . I I �� I --... I I I 11 I 1C1J l I �. r --Tl"" . J L I I I 1 1..: .i . I rt 1 iJL±i I i i i ._. .. . I . i -r -- I =- ±LL • . L-� I I F _. I' _I ..a r. I I i .---__.....r yx i !-I _ l II 1_._1. I I I-:- i i_ f - 1�. ..l I I- I I I I l l -- -I 1 I I y� -___ i 1 1 _ I �L I -----------_L___ 1 I I I i �1 I I I ! -- ' - -1__ ', ,I i-. _ I 1 i 1 T i I I. I -- �. i i J rT_ CL' � IiI__I : I j I I i. I. 1 1. f 1 J .: 1 i : 1 I I r-. _. _ . ;� 11 I I ' I, .. I -- - i r 1 I. 1 I ' i •' . / �fJ \Tf�� i_ I 1 1 1-I _ _i_ _._. i 1-1-._;I .. ..... r - -i 1 I _I. I L 1I} I I : 1 fp. 0 : ' • i• 1- IL - --.- I ' •f i ].�- -�.. - ! -- J L _ 1 -.._ --,---H ! I 1 _! _ - I I - - I - I - - �- - 1- ! I I -.- - �- - - _ �-- -; - -- = I I [ :_ i1 I i I ill i I HII - 1R AC D -I- _ I_ __I I !. [ I I 1 _ �I 1 I - 1 !, - - I I� I ---III _ :. J I 1- i- f - I I 1 :. -• .. - I. ! i , _ I I:- l I I- I I -•- LEGEND - - 1% ANNUAL CHANCE FLOOD iEL : I -.--._._.. I I _�._ L I ..`. - I _.L.___ L' I I . L - I L - ---- 1 1 .. �._: f _ I 1 • �_ ! �l _ __ III _! .� I l i, i _ I i .- -L _ i � 1 1_ . I. JI I 1 A I IH L I L. ---....1- :=.• 1 vl 1 -- ,I -1-I-L_L I _..:� 11 I ! _. .__. ' 1 �l 7%kg. t\` � STREAM BED CROSS SECTION LOCATION 8,300 8,800 9,300 9,800 10,300 10,800 11,300 11,800 12,300 12,800 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 13,300 13,800 14,300 4790 4785 4780 4775 4770 4765 4760 14,800 FLOOD PROFILES JOHN LAW DITCH FEDERAL EMERGENCY MANAGEMENT AGENCY 0 O AND INCORPORATED AREAS 59P ELEVATION IN FEET (NAVD) 4800 4795 4790 4785 4780 4775 4770 • . z • • w • .w r • i f'. r • G r GC ...I .. .... .. LEGEND 1% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4800 4795 4790 4785 4780 4775 14,800 15,300 15,800 16,300 16,800 17,300 17,800 18,300 18,800 19,300 19,800 20,300 20,800 21,300 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER FLOOD PROFILES JOHN LAW DITCH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 60P ELEVATION IN FEET (NAVD) 4810 4805 4800 4795 4790 • LU • -J i i • - • I.....,�. LEGEND — — 1% ANNUAL CHANCE FLOOD AWAYA STREAM BED CROSS SECTION LOCATION 21,300 21,800 22,300 22,800 23,300 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 4810 4805 4800 4795 4790 FLOOD PROFILES JOHN LAW DITCH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 61P ELEVATION IN FEET (NAVD) 4780 4775 4770 4765 4760 4755 u.i O' I f .. I i ! I °I' LEGEND 1% ANNUAL CHANCE FLOOD A iC k STREAM BED CROSS SECTION LOCATION 0 4780 4775 4770 4765 4760 4755 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE LIMIT OF DETAILED STUDY FLOOD PROFILES 2 O J LL i 2 J_ LL 5w 2 Z 2 ❑ O O a Z O a J O O FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREA 62P ELEVATION IN FEET (NAVE)) 4760 4755 4750 4745 -400 100 600 1,100 1,600 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - WHITNEY FLOW PATH LEGEND 1% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4760 4755 4750 FLOOD PROFILES 2 H a 0 J I.L 3- 0 W Z W IL 0 I- Q J 0 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 63P ELEVATION IN FEET (NAVD) 4755 4750 4745 4740 100 200 300 400 0 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - GWD FLOW PATH LEGEND 1% ANNUAL CHANCE FLOOD `Vocke(AVA STREAM BED c CROSS SECTION LOCATION 4755 4750 4745 FLOOD PROFILES JOHN LAW DITCH - FRE SE FLOW PATH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREA 64P ELEVATION IN FEET (NAVD) 4755 4750 4745 4740 4735 1 I I; 0 500 1,000 1,200 2,000 2,500 3,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - KODAK L FLOW PATH I • LEGEND 1% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4755 4750 4745 4740 FLOOD PROFILES JOHN LAW DITCH - FRE SW FLOW PATH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 65P 4,760 4755 4750 W W W z O 4745 4740 4735 4730 _. I I. DI�CIj ! - I : •I 1 r" :- ' 1_ I r: I: .- I i I I ' •1 -- y r l- I _ i •--.- I -: -,.... I .. ; _T 2 .. I __•.. I• I .. 1 1 I • -- -_ I I: I I. _ _ I I --,._.,_,_,.. I _. . I I I _. !-:- . 1 I _ _ . i I .- I - _ 1 1: _ I I H i I' ,r;:---- I : ! I I ._l. 1 I : I '- I, J i I .I. 1 L.. l -- I I ,l I I I - ,I •1 :-I 1. I i l I I •i I 1 I :. I I I 1 i I j -.1 H I -I :1- . 1 [ i I i l I : , -- -I -' I i I.1 FtO - ? VF �Q A}CL1 HN PPi`C` . . ... .. ;. : : ' ", : ._i 1 1_, 1 . . JENCE OF JOHI -FRESEFL=OW - . -----..._I . . I . , r.- _1 : : I I I ... + I II �. NCE FROM JO VVC-R-23 FL - I . „' I I i 1 1 ... I- ..I I1 j I f I . I i : I - : {..: , I --- - I �; I: .! ,i I I I I i I - • . _- _ ! I I •I. I ' :—. ! •.. ,•I . ' I zUi .� C.? I .. , I I _I_ ,.. : . ,I r I -,: • I : I : I . i ._ __ 1 : .i.1 I I !;•I_' i I - O! • I�-I.... I, 0 I ' -- . I -; .. ... r �. _ ... ! I j . : : I ; 1 • .�. I I I li ; i.i .. I I I ;.. . t _ —. 1 t.. _ . • _, I • ..... _ 1. i . : • 1 1 II I I __________,±I . I I I I II I Li I I , -L _ L . i ::. a . - 1 •f I _.: I I L__:. jI i I I . r i_ I L I. .. II 1 I 1.I I I I .. _'. I ; I I. I . I I ! I r . I • 11 I ' � -.I i _; _I I I I . I -I . I I I i ;-. - - � - - I ] -. -:- I I . k__ _ [ -- -C'� T- C I - I —1 ] I ----- -- I I-- I-_ 1---1 I _L I I :I _ C� -1I 1 1 f I r't'!*"ff__ 1• I• I I 1 I I� — , --r----- I I :': I - : ii ' I- i 1-1- �1: ��- - y : -i- ..- __ i 1 '_ 1 r r i I-' I I 1 - i .! i :I1 l Fr I I-1 ! 11 I I_ J_. iI I : : 1'I I I L-[!�-_ I �, • �- • r • { ; I I . ! . ... L I - I I ! I, �{ l . i I _ L ! 11 _ I r...l I I if I .. I .. 4 I I -- �.. I.! .- i . i �I,I 1 ; I' l . I .. I :-I -- is I -- .. - .. •- ! I I 1 : 1 ---�- - - Imo. I_ -_T - I _ . I: : 11- i • 14-L - - !_,_I_.. L ; I -I _ I_ . - -T LEGEND - I f 1 I I I I T 1% ANNUAL CHANCE FLOOD ••i1 I• Ti .� I _ _ i I i ID_ 1L. - - i- 1 r _, .., --- _ 11 1- I 1 11- - _. .�I I 1- .I • I I I ;. f _...rl--I T 1 - _ I • T- _r l I I { ! • , • 11'1' 1 , 11 •0 I ' ' I • STREAM BED CROSS SECTION LOCATION 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER ,760 755 750 745 740 4735 w J L O 0_ 0 0 U - JOHN LAW DITCH - GWD FLOW PATH EMERGENCY MANAGEMENT AGENCY w LU - 0 z 0 U O w AND INCORPORATED AREAS 66P ELEVATION IN FEET (NAVD) 4750 4750 4745 4740 4735 4730 4725 4720 i. i I i 1% ANNUAL CHANCE FLOOD A\VIA\'G STREAM BED CROSS SECTION LOCATION 4755 4750 4745 4740 4735 4730 4725 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER U] W J_ LL 0 12 0 0 0 J LL JOHN LAW DITCH - KODAK L PATH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 67P ELEVATION IN FEET (NAVD) 4775 4770 4765 4760 4745 6,500 7,000 7,500 8,000 1 dip LEGEND 1% ANNUAL CHANCE FLOOD ,` `Yeek STREAM BED J CROSS SECTION LOCATION 4775 4770 4765 4760 4755 4750 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 13,000 FLOOD PROFILES JOHN LAW DITCH - KODAK L PATH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 68P ELEVATION IN FEET (NAVD) 4765 4760 4755 z 1 O 3 0 500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - RAILROAD FLOW PATH I LEGEND 1% ANNUAL CHANCE FLOOD "YAW //\ STREAM BED CROSS SECTION LOCATION 4765 4760 4755 FLOOD PROFILES JOHN LAW DITCH - KODAK ROAD SPLIT FLOW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 69P ELEVATION IN FEET (NAVD) 4765 4760 4755 4750 4745 4740 4735 • ii :0 0 0.. 3 9. I W O: LL Z . I ?, I. I LEGEND 1% ANNUAL CHANCE FLOOD 1ST AWA STREAM BED r CROSS SECTION LOCATION 4765 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - KODAK L PATH 5,000 5,500 4760 4755 4750 4745 4740 FLOOD PROFILES JOHN LAW DITCH - RAILROAD FLOW PATH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 70P E - 4760 F- w w w z z O 4755 w J MI STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - GWD FLOW PATH CO W J_ LL 0 a 0 0 J LL JOHN LAW DITCH - WCR 23 FLOW PATH FEDERAL EMERGENCY MANAGEMENT AGENCY 0 C) F- Z D O O O LLI AND INCORPORATED AREAS 71P O Z_ I - w w U- z z a 4760 4755 4750 4745 L II, Ii • I I • H -.I.: I ! I -71- 1it I. .-1_- I- - i 1 ii F....T.. 1 • II — ' I •- 1 I •,•. _ ! 11 I • I 1 f LJ-.1 . :I i1 11 1 4740 0 -1- I T111. --1 I • is 1 r- i-;. if • I • • - - If 11 • i:l r I -' • I I.:_• 'il I 1�1 • L1 I ; . ri . . _I j=1 -f : F LI I L I•�I II • • ;i• J L - li Ii-- -1 `I I I -i i I-- -': I I I I L ii` ..r. T _I_1_: •I t I_ H 1 .- ri 1 I -F1 I ' • 1 . I -Ii I i i -11 ! 1 I I :_i.. i._. I1 . .1. ! II1 l -. I I I I 1:1I I• I 1: 1 ilf ..ii -.I. I i 1 1.--.-1._ I 1 1 i % i l _ I ,. T .` t :- IL 1 !- I :"1_..: I:. 1.111 .I. ! : _ !- L -L •. ll II- I • - r :,r 11- I T -! -I i • It111 I ;_I_..Lr. , I• _:: 1I- I 1 I I. • —r LII :II II I -- Ii • • Y 7 rL 1 ll, II 1 1I• - I L. . !i II 1 11 • 1 :..__, • l• 1111 • . H :I LEGEND -- - 1% ANNUAL CHANCE FLOOD ZA` STREAM BED CROSS SECTION LOCATION 200 400 600 600 1,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - GWD FLOW PATH 4760 4755 4750 FLOOD PROFILES JOHN LAW DITCH - WCR 23 LOWER FLOW PATH FEDERAL EMERGENCY MANAGEMENT AGENCY 0 0 O W AND INCORPORATED AREAS 72P ELEVATION IN FEET (NAVD) 0 500 1,000 1,500 2,000 2,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH FLOOD PROFILES JOHN LAW DITCH - WEST TRIBUTARY FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 73P z w W LL z O 4760 W 4755 4750 4745 •,l I._.: I .1 1 I -`I..,. JI•,I !'• I.:i !;. II li ii I • .j • • I I. i I 1 1 I I. I --,.I..: Il .i• iI - . T • . I ' •u- I. I, ;1 - . I I. I [ 1 -r t ' III Ii ! I- 1 ! II l.. I I .� . 1 1 I I I . I I 1 I ___I_ I'Ii.T I I :LI I 11.1 ≥_. • 1 I 1 I i r1 1( _ H 1 I I L 1 I •• T I I i I - l -I i i r7 - � I 0 500 .I 1,000 I L.i : II II I I I I.L1— I.i . i I _i! 1 —1. I -i —I' I' I I II i - I. I i I l7 • LI I • • I• ,I .II 1II --1 II. r,_I i r. I• III. •II - • I i. I III:L_ I— I ,.- LI 1 I r I.I....-t:: 1,� : II I I • I..• I.I-L_, it I ..�..I-'-- il I 1 I I _ 'I I iI I i _l, ' i I I; -I 1 II ,I L l 1 i -:J-� I:i_. ,_II Ii I : - 1 - I 11. I .II i{ I - I • I:' -�...,Ii_:1. I �I .i•Ia`I ii r - _I L I I I •.1: I.II! • ili I L F 1 I I 1 I . I • I • Ii_ I I I' Ill1 I 'ii L...1 .-1-- _i.. 11 I I I I -'.; I I. : I I.J 'I: r I1:1 I I I I 1 1 .i I. LEGEND - 'I% ANNUAL CHANCE FLOOD b STREAM BED CROSS SECTION LOCATION 1,500 2,000 2,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH - FRE SE FLOW PATH 4760 4755 4750 W LL O 0 O 0 LL FEDERAL EMERGENCY MANAGEMENT AGENCY 0 F- 0 0 AND INCORPORATED AREAS 74P 4,780 4,770 4,760 4,750 0 • 4,740 I - W W I.L z O 4,730 4,720 4,710 4,700 % ANNUAL CHANCE BACKWATER FROM BIG TI-i OMPSON RI a w } z 0 f17 2 U C I w O z w J LL z a O J_ VER HIGHWAY 257 RAI LROAD - ....... f r --rf 4,780 4,770 4,760 -14,750 ,TE HIGHW 4,690 _ 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 LEGEND 0 2% ANNUAL CHANCE FLOOD —• '' ""•— "1%+"ANNUAL CHANCE FLOOD" 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD ' — 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD YG `e" STREAM BED CROSS SECTION LOCATION . oATANp7 AWRABLE 5,000 5,500 6,000 4,740 4,730 4,720 4,710 6,500 W w J Z LL 0 O cl) a o ❑ O 0 0 LL I- I - J FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U I - z 0 U J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 75P 4,800 4,790 4,780 4,770 4,760 W W LL z_ O 4750 4,740 4,730 4,720 4,710 w TE FARM SRI 4,800 rm- • 4,790 4,780 4,770 14,760 B LEGEND 0.2% ANNUAL CHANCE FLOOD -•-••-••-••- '1%+" ANNUAL CHANCE FLOOD' 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD rfic4Mt STREAM BED CROSS SECTION LOCATION • DATA NOT AVAILABLE 4,750 6,500 7,000 4,740 4,730 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 12,500 13,000 W tY Z 0 0) 0 2 0 2 I — W J I — J EMERGENCY MANAGEMENT AGENCY W a W LL. WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 76P 4,820 4,810 4,800 4,790 4,780 F- w w w z z O 4,770 4,760 4,750 4,740 01 LINTY ROAD WELD 1 LARIM -r - • . - • - -- - L COUNTY ROAD 4 4,730 13,000 13,500 14,000 14,500 rr 4,820 4,810 4,800 4,790 4,780 �,-- 4,770 4, 760 LEGEND 0.2% ANNUAL CHANCE FLOOD • - - • • - • - "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD • - --' - - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD (" "r STREAM BED CROSS SECTION LOCATION 15,000 15,500 16,000 16,500 17,000 17,500 18,000 18,500 19,000 J 4,750 19,500 W U? ≥ W o J U- o re a a � O O I- o W J J LL I- I` J FEDERAL EMERGENCY MANAGEMENT AGENCY O O z 0 O J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 77P 4,830 4,820 4,810 4,800 ? 4,790 I- w w u_ z z a 4,780 4,770 4,760 4,750 4,740 a a z 8 err 4,830 • LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - • - -^ ' - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4,820 4,810 4,800 4,790 4,780 14,770 19,500 20,000 20,500 21,000 21,500 22,000 22,500 23,000 23,500 24,000 24,500 25,000 25,500 4,760 26,000 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPS0N RIVER 78P 4,840 4,830 4,820 4,810 ? 4,800 I w U. z z O 4,790 w 4,780 4,770 4,760 4,750 ------------- 26,000 26,500 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 31,000 z D LEGEND 0.2% ANNUAL CHANCE FLOOD - " - " - • • "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD - ' - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED 31,500 CROSS SECTION LOCATION 32,000 4,840 -4,830 4,820 4,810 4,800 4,790 4,780 4,770 32,500 W LL 0 a 0 0 J LL cc Z 0 IZ 2 0 2 W FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79P 4,850 4,840 4,830 4,820 4,810 w W U - z O 4,800 4,790 4,780 4,770 4,760 32,500 37,500 38,000 38,500 33,000 33,500 34,000 34,500 35,000 35,500 36,000 36,500 37,000 LEGEND 0-2% ANNUAL CHANCE FLOOD "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4,850 4,840 4,830 4,820 4,810 4,800 4,790 4,780 39,000 co W J_ LL 0 0 0 0 J LL E THOMPSON RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY 0 0 z 0 0 W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79(a)P 4,860 4,850 4,840 4,830 ? 4,820 I- w w u_ z z O j 4,810 4,800 4,790 4,780 4,770 - �~ , . • - • -�� __ --- :__-_ 39,000 39,500 40,000 40,500 41,000 41,500 42,000 42,500 43,000 LEGEND 0.2% ANNUAL CHANCE FLOOD - " - • • - " "1%+^ ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - - - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD ' STREAM BED CROSS SECTION LOCATION 43,500 44,000 44,500 45,000 4,860 4,850 4,840 4,830 4,820 4,810 4,800 4,790 45,500 co W J_ LL O cc cL O O U- LITTLE THOMPSON RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U z O O J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79(b)P 4,880 4,870 4,860 4,850 ? 4,840 w w LL z z O j 4,830 4,820 4,810 4,800 4,790 45,500 )UNDARY UNDARY UNDARY UNDARY UNDARY UNDARY UNDARY UNDARY MER COUNTY Si ER COUNTY B liER. COUNTY I3 ER COUNTY D VIER COUNTY BC FIER COUNTY BC RIMER COUNTY INFER COUNTY WELD / LARI LARI WELD f.LARI WELD / LARI WELD! LARI WELD 1 LARI WELD I LA WELD ! LAF - . r`. �r - .! r .� - � r� �` ter. �• '�" �.�... ^am • LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- ^1%4' ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - - - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD t STREAM BED a � CROSS SECTION LOCATION 46,000 46,500 47,000 47,500 48,000 48,500 49,000 49,500 50,000 50,500 51,000 51,500 ,880 ,870 ,860 ,850 ,840 ,830 4,820 4,810 52,000 FLOOD PROFILES TTLE THOMPSON RIVER FEDERAL EMERGENCY MANAGEMENT AGENC 0 U z 0 U J w AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79(c)P 4,890 4,880 4,870 4,860 • 4,850 F- W w u_ z z O 4,840 4,830 4,820 4,810 4,800 52,000 52,500 53,000 53,500 54,000 54,500 55,000 55,500 56,000 56,500 57,000 7 O 0 ce w w BOUNDARY COUNTY ROAD 44 O U_ INTERSTATE 25 r - LEGEND 0.2% ANNUAL CHANCE FLOOD - "-"-"-"- "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - ' - - ' - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD r% N STREAM BED CROSS SECTION LOCATION 57,500 58,000 4,890 4,880 4,870 4,860 4,850 4,840 4,830 4,820 58,500 FLOOD PROFILES W Z 0 IZ 2 0 I- W J I - J FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79(d)P 4,910 4,900 4,890 4,880 0 ? 4,870 I - W W LL. z z O 4,860 W 4,850 4,840 4,830 4,910 RIVATE DAM • 4,900 4,890 4,880 4,820 58,500 59,000 59,500 60,000 60,500 61,000 61,500 62,000 62,500 63,000 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••--••- "1% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD viii fJiR//mil STREAM BED CROSS SECTION LOCATION 63,500 64,000 64,500 4,870 4,860 4,850 4,840 65,000 FLOOD PROFILES IY W J IY Z 0 0 2 0 H W EMERGENCY MANAGEMENT AGENCY W O W LL 0 z 0 O J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79(e)P A Wan 4,930 FLOOD PROFILES LITTLE THOMPSON RIVER 4,920 4,910 NAVD) a 0 -co 1 a o D 0 C C WE(,.D1LARI 4,900 4,890 r .ter _ ------ r rr� 4,880 4,870 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS ___T__ 4 4,860 LEGEND ANNUAL CHANCE FLOOD 0.2% - • • - • • - - - - • • - "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,850 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD W 1 0.Wften..STREAM BED �hh CROSS SECTION LOCATION 4,840 65,000 65,500 66,000 66,500 67,000 STREAM 67,500 DISTANCE 68,000 IN FEET ABOVE 68,500 CONFLUENCE 69,000 WITH BIG THOMPSON 69,500 RIVER 70,000 70,500 71,000 71,500 79(f)P 4,940 4,940 FLOOD PROFILES LITTLE THOMPSON RIVER 4,930 - - 4,930 4,920 - - - - - ;0L NTY ROAD 4,920 4,910 - 4,910 E. 4,900 - - 4,900 4,890 -� y __ - w- W 4,880 I- _�„----------- - 4,890 4,880 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,870 I 4,870 LEGEND FLOOD - - - - - 02% ANNUAL CHANCE - . ' - • . - • • - • • - "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,860 - 2% ANNUAL CHANCE FLOOD V - - - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD fib '/`D STREAM BED CCROSS SECTION LOCATION I- 4,850 71,500 72,000 72,500 73,000 73,500 STREAM 74,000 DISTANCE 74,500 IN FEET ABOVE 75,000 CONFLUENCE 75,500 WITH BIG THOMPSON 76,000 RIVER 76,500 77,000 77,500 78,000 79(g)P 4,950 4,940 4,930 4,920 4,910 I - w w u_ z z O j 4,900 J 4,890 4,880 4,870 ------ a_0 rL O w z O 0 4,860 78,000 78,500 79,000 79,500 80,000 80,500 81,000 81,500 82,000 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%+"ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - '- ' - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD ,59,/\\W". STREAM BED CROSS SECTION LOCATION 82,500 83,000 83,500 84,000 J 4,950 4,940 4,930 4,920 4,910 4,900 4,890 4,880 84,500 FLOOD PROFILES 0C W z 0 0) 0 2 0 2 F - W J FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U z 0 O O W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79(h)P 4,970 4,960 4,950 4,940 ? 4,930 I- w w z z O 4,920 4,910 4,900 4,890 O I - z C U RIVATE DRIVEi rr ry1 4,970 4,960 AD A 4,880 84,500 AC LEGEND 0.2% ANNUAL CHANCE FLOOD "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4,950 4,940 4,930 4,920 4,910 4,900 85,000 85,500 86,000 86,500 87,000 87,500 88,000 88,500 89,000 89,500 90,000 90,500 91,000 FLOOD PROFILES CL W ce Z O U) 2 O 2 I W FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 79(i)P 4,980 -- -' FLOOD PROFILES LITTLE THOMPSON RIVER 4,970 4,980 4,960 vi uWa FLLPH 4,970 4,950 4,960 O a ? 4,940 4,950 w w Li- 4,940 ? _--.- -'- :.:. 4,930 r_ te_ ¢ --r r- 4,930 w J W 4,920 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS • 4,910 / 4,920 4,910 LEGEND 02%ANNUAL CHANCE FLOOD —••—••—••—••— "1%+" ANNUAL CHANCE FLOOD — — 1% ANNUAL CHANCE FLOOD 4,900 —__ — 2% ANNUAL CHANCE FLOOD - � - - • - 4% ANNUAL CHANCE FLOOD — 10% ANNUAL CHANCE FLOOD ,TAyakke.A.N., STREAM BED CROSS SECTION LOCATION 4,890 91,000 91,500 92,000 92,500 93,000 93,500 94,000 94,500 95,000 95,500 96,000 96,500 97,000 97,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 790)P 4,754 4,752 4,750 4,748 4,746 I - w w w z z O j 4, 744 w 4,742 4,740 4,738 4,736 0 r I eee 7' r/ / or r ! ...7 f x Y I r / yV f / V —y / VI 7.f�--�— - - - r I -- ��_. ��r �rrr� LEGEND CHANCE FLOOD CHANCE FLOOD" FLOOD FLOOD FLOOD CHANCE FLOOD LOCATION 0.2% ANNUAL "l%+" ANNUAL - - 1% ANNUAL CHANCE - 2%ANNUAL CHANCE - 4%ANNUAL CHANCE - 10% ANNUAL — A �f - - . - • - - ' ^ 1321cgrftW STREAM BED CRO• SS NOT AVAILABLESECTION 0 200 400 600 800 1,000 1,200 1,400 1,600 STREAM DISTANCE IN FEET UPSTREAM OF N. JOSEPHINE AVENUE 1,800 2,000 2,200 2,400 ,754 ,752 7mn ,748 4,746 4,744 4,742 4,740 2,600 FLOOD PROFILES F — J 0- Cr) 0 J of w N> Ld_ z 0 0 2 0 W J F — J FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY , CO AND INCORPORATED AREAS 79(k)P a can . - FLOOD PROFILES LITTLE THOMPSON RIVER SCHAAL SPLIT ELEVATION IN FEET (NAVD) - 10 o CO CO CO CO [O Co C (11 o cm o c� i o ccsi c CONFLUENCEWITH LITTLE THOMPSON RIVED ,k i\ o � m 1. e 4,940 —Oi —O !K Z D O 4,935 v , — — 4,930 = 10% AND 4% ANNUAL E TOO CLOSE r0 CHANCE BE SHOWN FLOOD PROFILES SEPARATELY 4,925 4,x20 _ y� r r� rr 4,915 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS i 4,910 4,905 LEGEND 0 2% ANNUAL CHANCE FLOOD -•'-••-"-•'- "1%+^ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 4,900 - 2% ANNUAL CHANCE FLOOD . . ' - - ' - - ' - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD , STREAM BED CROSS SECTION LOCATION 79(I)P 4,756 4,754 4,752 4,750 4,748 I - w w w z z O a 4,746 w 4,744 4,742 4,740 4,738 I NOTE THE 1 CHANCE TO BE k -AND 4.2% FLOOD PRCFILES SHOWN SEPARATELY ,�"rte' ' I rl t , r" - . ' -- . - ANNUAL ARE TOO CLOSE I • ter... �� / - 1 MPSON RIVER i. M LITTLE TH I IVERGENCE FR LEGEND 0.2% ANNUAL CHANCE FLOOD "l%+" ANNUAL CHANCE FLOOD* - - 1% ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD - .LI B I A(1.,:j CI37- - 4%ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD STREAM BED 0 CROSS SECTION LOCATION . DATA NOT AVAILABLE 400 800 1,200 1,600 2,000 2,400 2,800 3,200 STREAM DISTANCE IN FEET UPSTREAM OF S. KATHELEEN AVENUE 3,600 4,000 4,400 4,800 ,756 ,754 ;752 ,750 ,748 ,746 ,744 4,742 5,200 FLOOD PROFILES J U- (I) (O U) W 0 0 0 F - W J F - J FEDERAL EMERGENCY MANAGEMENT AGENCY 0 z O U w AND INCORPORATED AREAS 79(m)P ELEVATION IN FEET (NAVD) 4740 4735 4730 • 4725 0 400 I I s . 800 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SHEEP DRAW LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4740 4735 4730 4725 FLOOD PROFILES PUMPKIN RIDGE SPLIT FLOW PATH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 80P 4,770 FLOOD PROFILES ST. VRAIN CREEK 4,770 1 PCT ANNUAL CHANCE FLOOD BACKWATER FROM SOUTH PLATTE RIV R 4,765 it w : "1 4,765 SOUTH PLArr! ---- 4,760 4,760 FLUENCE WITH • Y 4,755 �� r f 4,755 z Y it - - �� - _� r r r r K.4,750 ---' __ - - 4,750 _ _ r� UNTY ROAD t w U. z z 0 4,745 - -- Y r r _____ ___ ________ 4,745 j w Ili t3 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,740 4,740 4 4,735 4,735 - LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,7.30 2% ANNUAL CHANCE FLOOD - - - - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD STREAM BED 0 CROSS SECTION LOCATION 4,725 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 81 P 4,775 I FLOOD PROFILES ST. VRAIN CREEK 4,770 r 4,775 4,765 4,770 4,765 4,760 .� _ _ _-"':_ .�� 4,760 .... _ ? 4,755 _ -_ - wILI z z O 4,750 __-^--_ . -! - 4,755 w -J W 4,750 4,745 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,740 -qfi 'i/ --- -- I c l _ 4,745 4,740 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,735 2%ANNUAL CHANCE FLOOD - - . - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD Imo"/ � STREAM BED rji CROSS SECTION LOCATION 4,730 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 11,500 12,000 12,500 13,000 82P 4,780 FLOOD PROFILES ST. VRAIN CREEK 4,780 i 4,775 4,775 wix 0 Q 0 4 LE 4,770 4,770 - - - -� �' — 4,765 - -- - — - 4,765 _._.� �� -ter rte. ��. -- ------ ~ �- tea. T. -�.. ? 4,760 I- — -z ' 4,760 z 0 a - 4,755 4,755 w w Trr Trf _ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,750 14,750 ... 4,745 4,745 LEGEND 0.2% ANNUAL CHANCE FLOOD —•.—••—••—••— "1%+" ANNUAL CHANCE FLOOD — — 1% ANNUAL CHANCE FLOOD CHANCE FLOOD a 2% ANNUAL 4,740 - - • - - • - 4% ANNUAL CHANCE FLOOD — — 10% ANNUAL CHANCE FLOOD \, STREAM BED CROSS SECTION LOCATION 4,735 13,000 13,500 14,000 14,500 15,000 15,500 16,000 16,500 17,000 17,500 18,000 18,500 19,000 19,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 83P 4,785 FLOOD PROFILES ST. VRAIN CREEK 4,780 4,785 4,780 4,775 4,775 -�- 4,770 // 4,770 _ ? 4,765 - - - �- ,� z z O 4,760 _ ----------- UNTY ROAD :. 4,765 j w .. 4,760 W. FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,755 - 4,750 .. 4 4,755 _ LEGEND 02% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD 4 4,750 - 1% ANNUAL CHANCE FLOOD 4,745 2% ANNUAL CHANCE FLOOD - - . - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD F /w STREAM BED j p ) CROSS SECTION LOCATION 4,740 19,500 20,000 20,500 21,000 21,500 22,000 22,500 23,000 23,500 24,000 24,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 25,000 25,500 26,000 84P .4 7g5 1 4,795 - ti . I. 1I . j i i 1 \\ \ . O CoC0 Cc.n O CO CD I ri FLOOD PROFILES 4,790 - 4,785 4,780 _-- 4,775 �- - -- z - �--- r _ ~� < r `__ 4,770 LLI kii �- rr Y r r ~ _ _�_----__-- 4,765-- 4,760 LEGEND 02% ANNUAL CHANCE FLOOD a \L EMERGENCY MANA' WELD COUN1 AND INCORPORATE - • • - • • - • • - " -"- "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4,755 - 4% ANNUAL CHANCE FLOOD - - 10%ANNUAL CHANCE FLOOD STREAM BED A CROSS SECTION LOCATION " 4,750 26,000 26,500 27,000 27,500 28,000 28,500 29,000 29,500 30,000 30,500 31,000 31,500 32,000 32,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 85P 4,800 FLOOD PROFILES ST. VRAIN CREEK 4,795 4,800 4,790 - - --- 4,795 4,785 X4,785 4,790 ? 4,780 '� - . ` . rr � ~� y - ' 1� ,_,� 4,780 LE . — -- f f -X-y p. 4,775 -_-__�_ �` ~� ....7..........:.......o Q J LE 4,775 4,770 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AN❑ INCORPORATED AREAS 4,765 - 4,770 4,765 LEGEND 9.2% ANNUAL CHANCE FLOOD • • -.- • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 4,760 - 2% ANNUAL CHANCE FLOOD i L) - - ' - - ' - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD STREAM BED A CROSS SECTION LOCATION 4,755 - - 32,500 33,000 33,500 34,000 34,500 35,000 35,500 36,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 36,500 WITH SOUTH 37,000 PLATTE RIVER 37,500 38,000 38,500 39,000 86P 4,805 4,805 FLOOD PROFILES ST. VRAIN CREEK 4,800 4,800 4,795 I _4,795 - _._. - te_ Y ' -- 4,790 r- . ____ f - _ _ 4,790 Jam- ? 4,785 4,785 w..-�_-- LL z_ z O 4,780 . .. ... . -- - 4,780 W _i W FATE HIGHWAY - '4,775 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,775�� 4,770 - - - 4,770 LEGEND 0.2% ANNUAL CHANCE FLOOD - .- - - - - - ' - - ' - '1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,765 2% ANNUAL CHANCE FLOOD - - - - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD /�/ STREAM BED IA CROSS SECTION LOCATION 4,760 39,000 39,500 40,000 40,500 41,000 41,500 42,000 42,500 43,000 43,500 44,000 44,500 45,000 45,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 86(a)P 4,815 4,815 FLOOD PROFILES ST. VRAIN CREEK 4,810 4,810 4,805 4,805 , 4,800 - - - ' 4,800 F.. 4,795 - - - - -- - 4,795 zO 4,790 �� ~ - r _ r -� r- - -� - . r • �� ---� --r--- r - _ - _-_:-•=.--- -- .� .- --- . ,...., ......,..,,. -- --w r 4,790 W J 4,785 _! -� 4,785 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,780 4 4,780 - - LEGEND 0.2% ANNUAL CHANCE FLOOD -.•-.--.• --`•- '1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,77.5? - 2% ANNUAL CHANCE FLOOD — — • — — • — 4%ANNUAL CHANCE FLOOD •- 10% ANNUAL CHANCE FLOOD 4.;%f/444..s. STREAM BED A CROSS SECTION LOCATION 4,770 45,500 46,000 46,500 47,000 47,500 48,000 48,500 49,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE 49,500 WITH SOUTH 50,000 PLATTE RIVER 50,500 51,000 51,500 52,000 86(b)P Q ? Lu' 11_- O 7 Li.' W 4,820 4,815 4,810 4,805 4,800 4,795 4,790 4,785 4,780 4,775 52,000 - 4,820 4,815 4,810 4,805 I 4,800 4,795 4,790 4,785 FLOOD PROFILES ST. VRAIN CREEK r f • -�� errs - r r ~ '! _ rr r l - y _ --- =�. �r err rr - - - FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 1 - LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD CHANCE FLOOD LOCATION —'•—•'—••—••— 9%+ANNUAL — I% ANNUAL CHANCE - 2% ANNUAL CHANCE — — - — — - — 4% ANNUAL CHANCE — — 10% ANNUAL frVl `el STREAM BED CROSS SECTION �JJ L:::) 52,500 53,000 53,500 54,000 54,500 55,000 55,500 56,000 56,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 57,000 57,500 58,000 58,500 86(c)P 4,830 4,825 4,820 4,815 0 ? 4,810 F - w w U- 0 j 4,805 4,800 4,795 4,790 f� r ------------------ a C7 C] LEGEND 4,785 _ 0.2% ANNUAL CHANCE FLOOD - -•- • • -• •- "1%-r ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 58,500 59,000 59,500 60,000 60,500 61,000 61,500 62,000 62,500 63,000 63,500 64,000 64,500 65,000 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY 0 U z ❑ 0 U J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 86(d)P 4,835 4,830 4,825 4,820 4,815 I Lu Lu LL z z O 4,810 Lu Lu 4,805 4,800 4,795 4,790 - 65,000 65,500 66,000 66,500 67,000 67,500 68,000 68,500 69,000 ray • y r r f� • 4,835 4,830 4,825 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 69,500 70,000 70,500 71,000 4,820 4,815 4,810 4,805 4,800 71,500 W W LL Q oec I..L O > O LL - O) FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 86(e)P 4,845 FLOOD PROFILES ST. VRAIN CREEK 1111 4,845 4,840 4,835 ill J� , Y r r - `�ry 4,840 4,835 4,830 - - r r r f _ {�'� f ft 4,830 O 4,825 - r r - r p- l rJ - - NTERSTATE 2� -,,`•rr'IIIIIIIIIII 4,825 w W LL z_ O 4,820IIMIIMIIII 4,820 4,815 IIIIw w FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS MI MN , 4,815 4,810 4,810 LEGEND - - - 0.2% ANNUAL CHANCE FLOOD - • ' - • • - • • - • • - '1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,805 - 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD ,w, STREAM BED CROSS SECTION LOCATION 4,800 71,500 72,000 72,500 73,000 73,500 74,000 STREAM DISTANCE 74,500 IN FEET ABOVE 75,000 CONFLUENCE 75,500 WITH SOUTH 76,000 PLATTE RIVER 76,500 77,000 77,500 78,000 86(f)P F... Z____ W 4,860 4,855 4,850 4,845 4,840 4,835 4,830 4,825 4, O 2O t7 4,815 78,000 4,860 4,855 4,850 4,840 4,835 4,830 4,825 FLOOD PROFILES ST. VRAIN CREEK WEIR - �' l � . . r - r JJ� - . - -b-- r _=4,845 - ---- f _ _ � te ~r , - ------ --r------ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS LEGEND CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION -••-••-••-••- 0.2% ANNUAL "1%+" ANNUAL 1% ANNUAL CHANCE 2% ANNUAL CHANCE ' - 4% ANNUAL CHANCE - 10% ANNUAL CHANCE - - - • - - - STREAM BED Ci CROSS SECTION 78,500 79,000 79,500 80,000 80,500 81,000 81,500 82,000 82,500 83,000 83,500 84,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 84,500 86(g)P 4,870 4,870 FLOOD PROFILES ST. VRAIN CREEK 4,865 - 4,865 4,860 -- 4,860 4,855 � 4,855 ❑ 4,850 - �'� � -' r - -r Yr r ,, rrrr - ___- - - .. `. 4,850 w z o 4,845 ----r -- `- r - .......... .__ - ._- �--- STATE H IG I - 4,845 w J W - - - ----Tr' -. FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,840 - 4,840 4,835 - - 4 4,835 • - -- LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- '1%4" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 4,830 2% ANNUAL CHANCE FLOOD - - • - - - - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD 47",/~%, STREAM BED aCROSS SECTION LOCATION 4,825 84,500 85,000 85,500 86,000 86,500 STREAM 87,000 DISTANCE 87,500 IN FEET ABOVE 88,000 CONFLUENCE 88,500 WITH SOUTH 89,000 PLATTE RIVER 89,500 90,000 90,500 91,000 86(h)P 0 a ? w w LL z Z O LU J W 4,880 4,875 4,870 4,865 4,860 4,855 4,850 4,845 r1 4,840 V 4,835 91,000 - --- 4,880 4,875 4,870 4,865 4,860 4,855 FLOOD PROFILES ST. VRAIN CREEK - m FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS .r 4,850 4,845 LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION - • • - • • - • • - • • _ "1%+" ANNUAL - - 1% ANNUAL CHANCE - 2% ANNUAL CHANCE - - - - - - - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE okyA` \, STREAM BED ' a' CROSS SECTION - - 91,500 92,000 92,500 93,000 93,500 94,000 94,500 95,000 95,500 96,000 96,500 97,000 97,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 96(i)P 4,920 FLOOD PROFILES ST. VRAIN CREEK PROFILE BASELINE COtNCI0ENT WITH BOULDER CREEK 4,920 4,910 U . ------ - 4,900 ONFLUENCE 0 OULDER CREE 4,910 4,890 - - - 4,900 a ? 4,880 4,890 w w 2 z O 4,870 --- 4,880 W 4,870 J W FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,860 . - - .r �. � ___ �---�- 4,860 4,850 4,850 - LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - - • - • • - • • - "1%+' ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,840 - 2% ANNUAL CHANCE FLOOD - • - - - 4%ANNUALCHANCE FLOOD 10% ANNUAL CHANCE FLOOD .y, STREAM BED 0 CROSS SECTION LOCATION 4,830 91,000 91,500 92,000 92,500 93,000 93,500 94,000 94,500 95,000 95,500 96,000 96,500 97,000 97,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 86( }P 4,920 a owl I 4,910 lkIN CREEK - P. a -CO -CO Ca -CO 0 CO 0 0 O C FLOOD PROFILES ST. VRAIN CREEK UCE OF ST, VR.1 Er U- 2 C I- cr 4,900 4,890 LCONFLUE a - -r 4,880 _ _- _ rr • �r - r r Q 4,870 - yr~ 01 0) o o =EDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,860 . . 4,850 LEGEND 0.2% ANNUAL CHANCE FLOOD - ' • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD ' - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD OW"'A STREAM BED CROSS SECTION LOCATION 4,840 4,830 - . 97,500 98,000 98,500 99,000 99,500 100,000 100,500 101,000 101,500 102,000 102,500 103,000 103,500 104,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 86rk'P 4,940 4,930 4,920 4,910 4,900 I- w w U - z z O 4,890 4,880 4,870 4,860 a 2 w w CONFLUEIIJCE OF DRY C r - w w O z DIVERGENCE OF ST. V S4WDSTONE SP 4,850 104,000 104,500 105,000 105,500 106,000 106,500 107,000 107,500 108,000 108,500 LEGEND 0.2% ANNUAL CHANCE FLOOD " - .. - " - - "1%+" ANNUAL CHANCE FLOOD 1%ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - �' '� • - 4%ANNUAL CHANCE FLOOD 10%ANNUALCHANCE FLOOD ~4•`e" STREAM BED CROSS SECTION LOCATION 109,000 109,500 110,000 4,940 4,930 4,920 4,910 4,900 4,880 4,870 110,500 FEDERAL EMERGENCY MANAGEMENT AGENCY O U H z 0 O J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 86(I)P 4,950 4,940 4,930 4,920 O ? 4,910 I w w w z_ z j4 4,950 4,940 4,930 4,890 4,880 4,870 4,860 LEGEND 0.2% ANNUAL CHANCE FLOOD 4,920 • — • — • "1%+" ANNUAL CHANCE FLOOD - - 1%ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD — 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD Keikkke" STREAM BED CROSS SECTION LOCATION 4,910 4,900 110,500 111,000 111,500 112,000 112,500 113,000 113,500 114,000 114,500 115,000 115,500 116,000 116,500 4,890 4,880 117,000 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY O U F- z O O O J W AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER J 86(m)P FLOOD INSURANCE STUDY VOLUME 4 OF 4 COMMUNITY NAME AULT, TOWN OF DACONO, CITY OF EATON, TOWN OF EVANS, CITY OF FIRESTONE, TOWN OF FORT LUPTON, CITY OF FREDERICK, TOWN OF GARDEN CITY, TOWN OF* GILCREST, TOWN OF GREELEY, CITY OF GROVER, TOWN OF* HUDSON, TOWN OF KEENESBURG, TOWN OF KERSEY, TOWN OF LASALLE, TOWN OF LOCHBUIE, TOWN OF* LONGMONT, CITY OF NUMBER 080179 080236 080180 080182 080241 080183 080244 080246 080213 080184 080025 080249 080251 080185 080186 080012 080027 *No Special Flood Hazard Areas Identified REVISED: FLOOD INSURANCE STUDY NUMBER 08123CV004B WELD COUNTY, COLORADO AND INCORPORATED AREAS COMMUNITY NAME MEAD, TOWN OF MILLIKEN, TOWN OF NUNN, TOWN OF PIERCE, TOWN OF PLATTEVILLE, TOWN OF RAYMER, TOWN OF* SEVERANCE, TOWN OF WELD COUNTY, UNINCORPORATED AREAS WINDSOR, TOWN OF TA RI NUMBER 080218 080187 080188 080189 080190 080069 080317 080266 080264 REVISED PRELIMINARY 3/23/2022 'yrn sc5•.-/ FEMA Version Number 2.6.4.6 TABLE OF CONTENTS Volume 7 Page SECTION 1.0 — INTRODUCTION 1.1 The National Flood Insurance Program 1.2 Purpose of this Flood Insurance Study Report 1.3 Jurisdictions Included in the Flood Insurance Study Project 1.4 Considerations for using this Flood Insurance Study Report SECTION 2.0 - FLOODPLAIN MANAGEMENT APPLICATIONS 2.1 Floodplain Boundaries 2.2 Floodways 2.3 Base Flood Elevations 2.4 Non -Encroachment Zones 2.5 Coastal Flood Hazard Areas 2.5.1 Water Elevations and the Effects of Waves 2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 2.5.3 Dams aand Other Flood Hazard Reduction Measures 2.5.4 Levee Systems SECTION 3.0 — INSURANCE APPLICATIONS 3.1 National Flood Insurance Program Insurance Zones SECTION 4.0 — AREA STUDIED 4.1 Basin Description 4.2 Principal Flood Problems 4.3 Non -Levee Flood Protection Measures 4.4 Levees SECTION 5.0 - ENGINEERING METHODS 5.1 Hydrologic Analyses 5.2 Hydraulic Analyses 5.3 Coastal Analyses 5.3.1 Total Stillwater Elevations 5.3.2 Waves 5.3.3 Coastal Erosion 5.3.4 Wave Hazard Analyses 5.4 Alluvial Fan Analyses SECTION 6.0 — MAPPING METHODS 6.1 Vertical and Horizontal Control 6.2 Base Map 6.3 Floodplain and Floodway Delineation 1 1 2 2 13 23 23 33 34 35 35 35 35 35 35 35 35 36 36 37 38 38 38 39 56 57 57 57 57 58 58 58 58 69 69 TABLE OF CONTENTS (CONTINUED) Volume 'I (Continued) Figures Page Figure 1: FIRM Index 14 Figure 2: FIRM Notes to Users 17 Figure 3: Map Legend for FIRM 20 Figure 4: Floodway Schematic 34 Figure 5: Wave Runup Transect Schematic 35 Figure 6: Coastal Transect Schematic 35 Figure 7: Frequency Discharge -Drainage Area Curves 45 Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 57 Figure 9: Transect Location Map 58 Tahleg Page Table 1: Listing of NFIP Jurisdictions Table 2: Flooding Sources Included in this FIS Report Table 3: Flood Zone Designations by Community Table 4: Basin Characteristics Table 5: Principal Flood Problems Table 6: Historic Flooding Elevations Table 7: Dams and Other Flood Hazard Reduction Measures Table 8: Levees Systems Table 9: Summary of Discharges Table 10: Summary of Non -Coastal Stillwater Elevations Table 11: Stream Gage Information used to Determine Discharges Table 12: Summary of Hydrologic and Hydraulic Analyses Table 13: Roughness Coefficients Table 14: Summary of Coastal Analyses Table 15: Tide Gage Analysis Specifics Table 16: Coastal Transect Parameters Table 17: Summary of Alluvial Fan Analyses Table 18: Results of Alluvial Fan Analyses Table 19: Countywide Vertical Datum Conversion Table 20: Stream -Based Vertical Datum Conversion Table 21: Base Map Sources Table 22: Summary of Topographic Elevation Data used in Mapping Table 23: Floodway Data 3 25 36 37 37 38 38 38 40 56 56 58 66 66 66 67 67 67 68 68 69 71 72 TABLE OF CONTENTS (Continued) Volume 2 Page 6.4 Coastal Flood Hazard Mapping 6.5 FIRM Revisions 6.5.1 Letters of Map Amendment 6.5.2 Letters of Map Revision Based on Fill 6.5.3 Letters of Map Revision 6.5.4 Physical Map Revisions 6.5.5 Contracted Restudies 6.5.6 Community Map History 120 120 120 121 121 122 122 123 SECTION 7.0 - CONTRACTED STUDIES AND COMMUNITY COORDINATION 125 7.1 Contracted Studies 125 7.2 Community Meetings 127 SECTION 8.0 — ADDITIONAL INFORMATION 129 SECTION 9.0 — BIBLIOGRAPHY AND REFERENCES 131 Tables Table 23: Floodway Data (Continued) 93 Table 24: Flood Hazard and Non -Encroachment Datafor Selected Streams 120 Table 25: Summary of Coastal Transect Mapping Considerations 120 Table 26: Incorporated Letters of Map Change 121 Table 27: Community Map History 124 Table 28: Summary of Contracted Studies Included in this FIS Report 125 Table 29: Community Meetings 128 Table 30: Map Repositories 128 Table 31: Additional Information 131 Table 32: Bibliography and References 132 iii TABLE OF CONTENTS (Continued) Volume 2 (Continued) Exhibits Flood Profiles Ashcroft Draw Big Thompson River Big Thompson River — CR 13 Split Boulder Creek Cache La Poudre River Cache La Poudre River - 35th Avenue to 25th Avenue Pits SFP Volume 3 Exhibits Panel 01 P -07P 08P-18(b)P 19P 20P -25P 26-46(c) P 46(d)P Flood Profiles Panel Cache La Poudre River Downstream of 83rd Avenue 46(e)P Pits SFP Cache La Poudre River- Habitat Lake SFP 46(f)P Cache La Poudre River - Kodak SFP 46(g)P Cache La Poudre River - North Island Grove Park SFP 46(h)P Cache La Poudre River - North of 8th Street SFP 46(i)P-46(j)P Cache La Poudre River - Over 83rd Avenue SFP 46(k)P-46(m)P Cache La Poudre River - Railroad to 35th Avenue Pits 46(n)P SFP Cache La Poudre River - South Island Grove Park SFP 46(o)P Cache La Poudre River - State Highway 392 SFP 46(p)P-46(q)P Cache La Poudre River - Upstream of 83rd Avenue Pits 46(r)P SFP Cache La Poudre River - Upstream of Railroad SFP 46(s)P-46(u)P Cache La Poudre River - Varra Pits SFP 46(v)P Cache La Poudre River - Waste Water Treatment Plant 47P SFP Cache La Puuure River - hater Valley SFP 48P -49P Coalbank Creek 50P -52P Consolidated John Law Ditch 53P iv TABLE OF CONTENTS (Continued) Volume 3 (Continued) Flood Profiles Panel Dry Creek No. 2 53(a)P Eaton Draw 54-57P Eaton Draw Split Flow 57(a)P Greeley Canal No. 2 58P John Law Ditch 59P -61P John Law Ditch — CO and Southern RR Flow Path 62P John Law Ditch — FR Energy Flow Path 63P John Law Ditch — FRE SE Flow Path 64P John Law Ditch — FRE SW Flow Path 65P John Law Ditch — GWD Flow Path 66P John Law Ditch — Kodak L Path 67P -68P John Law Ditch — Kodak Road Split Flow 69P John Law Ditch — Railroad Flow Path 70P John Law Ditch — WCR 23 Flow Path 71 P John Law Ditch — WCR 23 Lower Flow Path 72P John Law Ditch — West Tributary 73P John Law Ditch — Whitney Flow Path 74P Little Thompson River 75P-79(j)P Little Thompson River Railroad Split 79(k)P Little Thompson River Schaal Split 79(I)P Little Thompson River SI-160 Split 79(m)P Pumpkin Ridge Split Flow Path 80P St. Vrain Creek 81P-86(i)P V TABLE OF CONTENTS (Continued) Volume 4 Exhibits St. Vrain Creek — Existing Lakes 87P St. Vrain Creek — Sandstone Split 87(a)P-87(b)P Sheep Draw 88P -96P South Platte River 97P-118(j)P South Platte River Breach 118(k)P South Platte River Spill 118(I)P Spring Creek 119P Spring Creek Overflow 120P Spring Creek Tributary 121 P -122P The Slough 123P -124P The Slough — Below John Law Ditch Reservoir 125P -126P The Slough Split 1 — Below John Law Ditch Reservoir 127P Tri-Area Drainageway 128P -134P US Highway 34 Bypass Split Flowpath 135P Western Flow Path to Spring Creek Tributary 136P Published Separately Flood Insurance Rate Map (FIRM) vi ELEVATION IN FEET (NAVD) 4835 4830 4825 4820 4815 4810 z z' z.. Lu 1.1.; i ., 500 1,000 1,500 2,000 2,500 3,000 LEGEND 1% ANNUAL CHANCE FLOOD "VW STREAM BED CROSS SECTION LOCATION 0 3,500 4,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ST, VRAIN CREEK 4,500 5,000 5,500 6,000 4835 4830 4825 4820 4815 4810 6,500 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 87P 4,940 4,930 4,920 4,910 ?.. 4,900 I - w w u_ z_ z 0 4,890 w Lu 4,880 4,870 4,860 4,850 0 IN CREEK E WITH ST. V w C l O o Ls - , CONFLUEN 4 .� rte - . -=� r r LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD CHANCE FLOOD LOCATION -••-••-••-••- "1%+" ANNUAL 1%ANNUAL CHANCEFLOOD - - - 2% ANNUAL CHANCE • - 4% ANNUAL CHANCE 10% ANNUAL - - • - - r "er STREAM BED r A 1 CROSS SECTION 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 ,940 ,930 ,920 ,910 ,900 ,890 4,880 4,870 6,500 Cl) W J_ U- 0 0_ a 0 0 J U - ST. VRAIN CREEK SANDSTONE SPLIT EMERGENCY MANAGEMENT AGENCY LL w w LL WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ST. VRAIN CREEK 87(a)P 4,950 FLOOD PROFILES ST. VRAIN CREEK SANDSTONE SPLIT 4,940 IN GREEK TROLLED BY K . 4,950 4,930 4,940 4,920 DIVERGENC UPSTREAM E 4,930 ? 4,910 4,920 W w LL z Z O 4,900 4,910 W _I W 4,900 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS � 4,890 r~ - - 4,890 -+- 4,880 4,880 LEGEND 0.2% ANNUAL CHANCE FLOOD — . • — • • — • • — • • — "1%1." ANNUAL CHANCE FLOOD •— — 1% ANNUAL CHANCE FLOOD 4,870 2% ANNUAL CHANCE FLOOD - - • - � - 4% ANNUAL CHANCE FLOOD — — 10% ANNUAL CHANCE FLOOD r sy/ STREAM BED C) CROSS SECTION LOCATION 4,860 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 10,000 10,500 11,000 11,500 12,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ST. VRAIN CREEK 87(b)P ELEVATION IN FEET (NAVD) 4705 4700 4695 .1 VJQ I 1VUA BACKWATER FROM GA0NE•LA.POUDRE RIVER 47 4710 4705 4705 4605 480 z u O: U u- LU LU t O LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION I 0 4720 4715 4710 4705 4700 4695 400 800 1,200 1,600 1,200 1,600 2,000 2,400 2,800 3,200 3,600 4,000 4,400 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 88P ELEVATION IN FEET (NAVD) 4740 4735 4730 4725 4720 4715 i 4710 4705 4,400 4,800 • i. r " f - .. Y r Y 5,200 5,600 6,000 6,400 6,800 7,200 7,600 8,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER .... .....i. 8,400 uu z d n.• LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD AY,("",// �l(/�` STREAM BED 8,800 CROSS SECTION LOCATION 9,200 4740 4735 473D 4725 4720 4715 4710 9,600 FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 89P ELEVATION IN FEET (NAVD) 4765 4760 4755 4750 4745 4740 4735 4730 10,000 10,400 10,800 11,200 11,600 12,000 12,400 12,800 13,200 13,600 14,000 14,400 9,600 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER LEGEND 0.2% ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD A STREAM BED CROSS SECTION LOCATION 4765 4760 4755 4750 4745 4740 4735 14,800 FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 90P ELEVATION IN FEET (NAVD) 14,800 15,200 15,600 16,000 16,400 16,800 17,200 17,600 18,000 18,400 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 18,800 19,200 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 19,600 4795 4790 4785 4780 4775 4770 4765 4760 20,000 U) W J_ LI_ O 1Y 11 O (2J LL SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 91P ELEVATION IN FEET (NAVD) 4820 4815 4810 4805 4800 4795 4790 4785 w z LU a ce J -.J :: '. : , I J r< _ 1 f . I AD �Ir AC LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4820 4815 4810 4805 4800 4795 4790 20,000 20,400 20,800 21,200 21,600 22,000 22,400 22,800 23,200 23,600 24,000 24,400 24,800 25,200 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AN❑ INCORPORATED AREAS 92P ELEVATION IN FEET (NAVD) 4840 4835 4830 4825 4820 _ 4815 -= 4810 25,600 26,000 26,400 26,800 27,200 27,600 25,200 840 4860 41 5 4835 485l'i 830 :4 4$25 '4840 4820 4815 1C 483 4836 4826 r r f f ft i ACCESS ROAD J{'I 27,600 28,000 28,400 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER I 28,800 . 29,200 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 29,600 4860 4855 4850 4845 4840 4835 4830 30,000 FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREA 93P ELEVATION IN FEET (NAVD) 4870 4865 4860 4855 4850 4845 4840 4845 4870 4800 F . f. I 835 860 4855 r 41/ f M 850 18145 4840 18 5 4860 4875 L8 0 4865 4860 r r • r • f r . i I AO 1 P LEGEND 0.2% ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD "("~: STREAM BED CROSS SECTION LOCATION 4900 4895 4890 4885 4880 4875 4870 4865 30,000 30,400 30,800 31,200 31,600 32,000 32,400 32,400 32,800 33,200 33,600 34,000 34,400 34,800 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 94P ELEVATION 1N FEET (NAVD) 4910 4905 4900 4895 4890 4885 36,000 36,400 36,800 37,200 37,200 37,600 38,000 38,400 38,800 39,200 34,800 35,200 35,600 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD Ock STREAM BED CROSS SECTION LOCATION 4935 4930 4925 4920 4915 4910 4905 39,600 FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 95P ELEVATION IN FEET (NAVD) 4935 4930 AVV LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD Ake"`Y"e STREAM BED CROSS SECTION LOCATION 39,600 40,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 4935 4930 FLOOD PROFILES SHEEP DRAW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 96P 4,480 4,470 4,460 4,450 O a i 4,440 w w z z 0 4,430 LA _J LU 4,420 4,410 4,400 FLOOD PROFILES SOUTH PLATTE RIVER D 14 I~- 4,480 4,470 LINTY BOUNDA or DETAILED 4,480 O v 4,450 :. 4,440 -�-�- 4,430 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,420 _ 4,410 LEGEND ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION - -. - • - • - 0.2% - "l%+' ANNUAL i 1% ANNUAL CHANCE '- -' 2% ANNUAL CHANCE - - ' - - ' - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE I STREAM BED 0 CROSS SECTION 4,390 1,234,000 1,235,000 1,236,000 1,237,000 1,238,000 1,239,000 1,240,000 1,241,000 1,242,000 1,243,000 1,244,000 1,245,000 1,246,000 1,247,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 97P 4,570 4,570 FLOOD PROFILES SOUTH PLATTE RIVER 4,560 ci — 4,560 4,550 OF DETAILED S - - LINTY ROAD 4,550 4,540 2 -J .4, 540 E Q ? 4,530 _ r -�— -- ` �- 4,530 Lu _ - — - = � ` r 0 �—. a 4,520 w J W 4,510 , --- • 4 4,520 4,510 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,500 4 4,500 LEGEND CHANCE FLOOD 0.2% ANNUAL —••--••—••—••— "1%+' ANNUAL CHANCE FLOOD — — 1% ANNUAL CHANCE FLOOD 4,490 2% ANNUAL CHANCE FLOOD — — 4% ANNUAL CHANCE FLOOD — — 10% ANNUAL CHANCE FLOOD ,,,e,w,STREAM BED CROSS SECTION LOCATION 4,480 1,319,000 1,320,000 1,321,000 1,322,000 1,323,000 1,324,000 STREAM DISTANCE 1,325,000 IN FEET 1,326,000 ABOVE CONFLUENCE 1,327,000 WITH PLATTE 1,328,000 RIVER 1,329,000 1,330,000 1,331,000 1,332,000 98P 4,590 4,580 4,570 4,560 a ? 4,550 LLI 4,540 W 4,530 4,520 4,510 4,500 1,332,000 4,590 FLOOD PROFILES SOUTH PLATTE RIVER 4,580 4,570 4,560 x"4,550 4,540 - r + . 1 f rr� �r . _ 4,530 4,520 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS LEGEND _ CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION 02% ANNUAL -••-••-••-••- ^1%+^ANNUAL - - 1% ANNUAL CHANCE 2% ANNUAL CHANCE - — • — — • - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE • I ( STREAM BED V CROSS SECTION 1,333,000 1,334,000 1,335,000 1,336,000 1,337,000 1,338,000 1,339,000 1,340,000 1,341, 000 1,342,000 1,343,000 1,344,000 1,345,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER ggP 4,600 - 4,600 FLOOD PROFILES SOUTH PLATTE RIVER 4,590 - 4,590 4,580 w WEIR OUNTY ROAD 4,580 4,570 4,570 z. 4,560 - ----- 4,560 W Q 4,550 ' -^� r� �' `yam -r ��. _ f' _ 4,550 J W __ _ _ ____ 4,540 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,540 4,530 4 4,530 LEGEND 0 2% ANNUAL CHANCE FLOOD - • • - • - - . - - • - "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,520 1 2% ANNUAL CHANCE FLOOD - - - • - - • - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD 0 0 I; f� STREAM BED CROSS SECTION LOCATION 4,510 1,345,000 1,346,000 1,347,000 1,348,000 1,349,000 ' 1,350,000 STREAM DISTANCE 1,351,000 IN FEET 1,352,000 ABOVE CONFLUENCE 1,353,000 WITH PLATTE 1,354,000 RIVER 1,355,000 1,356,000 1,357,000 1,358,000 1 OOP 4,620 4,610 4,600 4,590 ? 4,580 I- w z z Q 4,570 4,560 4,550 4,540 4,530 1,358,000 FLOOD PROFILES SOUTH PLATTE RIVER 4,620 4,610 4,600 4,590 4,580 ::: , �. �� r� _r�� r-- '� _�- -y- . 1 - r �r - 4,570 4,560 . r -" . _ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS - 4,550 - LEGEND ANNUAL FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION 0.2% CHANCE -••-••-••-••- "1%+" ANNUAL - - 1% ANNUAL CHANCE 2% ANNUAL CHANCE - - • - - • - 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE - - - - w STREAM BED A CROSS SECTION 1,359,000 1,360,000 1,361,000 1,362,000 1,363,000 1,364,000 1,365,000 1,366,000 1,367,000 1,368, 000 1,369,000 1,370, 000 1,371,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 101P 4,630 4,620 4,610 4,600 O ?.4,590 Lu Q 4,580 w w 4,570 4,560 4,550 4,540 1,371,800 4,630 4,620 4,600 4,590 4,580 4,570 4,560 FLOOD PROFILES SOUTH PLATTE RIVER - - - - - .4,610 - � _ r .- _r_ r - _ , `_ FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS M LEGEND CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION — • 0.2% ANNUAL • — • • — • • — • • — 11%+" ANNUAL — 1% ANNUAL CHANCE 2% ANNUAL CHANCE — 4% ANNUAL CHANCE — 10% ANNUAL CHANCE — — - — „me"r STREAM BED JJJ�� r y 1 CROSS SECTION 1,372,800 1,373,800 1,374, 800 1,375,800 1,376,800 1,377,800 1,378,800 1,379,800 1,380,800 1,381,800 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1,382,800 1,383,800 1,384,800 1102P 4,640 4,640 FLOOD PROFILES SOUTH PLATTE RIVER 4,630 "' a w 4,630 4,620 UNTY ROAD p 4,610 5 Q u 4,620 4,610 ? 4,600 -- � ` i� . - - r _ . _ 4,600 w r� _ ``�'�„^ .�� O 4,590 r ,� .�_Y� - _r __ r rf� mil/ 4,590 a w__.- w _ - 4,580 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,580 4,570 4 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,560 - 2% ANNUAL CHANCE FLOOD - - • - - - - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD ��f v�� STREAM BED CI CROSS SECTION LOCATION 4,550 - 1,384,000 1,385,000 1,386,000 1,387,000 1,388,000 1,389,000 1,390,000 1,391,000 1,392,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE 1,393,000 RIVER 1,394,000 1,395,000 1,396,000 1,397,000 1 03P 4,660 4,660 FLOOD PROFILES SOUTH PLATTE RIVER 4,650 4,650 4,640 E. 18TH STREE" w 4,640 4,630 4,630 4,620 - 4,620 2 w Z Q 4,610 f r �_�� '� .... .rte 4,610 _ ,� ~~_ ~ter. FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,600 - 4,600 4,590 4 4,590 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • - • • - • • - • • - "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,580 2% ANNUAL CHANCE FLOOD - - . - - - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD �t STREAM BED :} CROSS SECTION LOCATION 4,570 1,397,000 1,398,000 1,399,000 1,400,000 1,401,000 1,402,000 1,403,000 1,404,000 1,405,000 1,406,000 1,407,000 1,408,000 1,409,000 1,410,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 104P 4,680 - - - - 4,680 FLOOD PROFILES SOUTH PLATTE RIVER 4,670 4,670 4,660 S. HIGHWAY 3 _S. HIGHWAY L 4,660 4,650 4,650 a ? 4,640 4,640 w w z Q 4,630 w _r- - - - _T __ -_ 4,630 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,620 T 4,620 4,610 ---� 4,610 LEGEND 0.2% ANNUAL FLOOD CHANCE —••—••—••—••— "1%+" ANNUAL CHANCE FLOOD — 1% ANNUAL CHANCE FLOOD 4,600 2% ANNUAL CHANCE FLOOD ... — — 4% ANNUAL CHANCE FLOOD — — 10% ANNUAL CHANCE FLOOD ::1 Ake", STREAM BED CCROSS SECTION LOCATION 4,590 - 1,410,000 1,411,000 1,412,000 1,413,000 1,414,000 1,415,000 1,416,000 STREAM DISTANCE IN FEET 1,417,000 ABOVE CONFLUENCE 1,418,000 WITH PLATTE 1,419,000 RIVER 1,420,000 1,421,000 1,422,000 1,423,000 1 05P 4,690 4,690 FLOOD PROFILES SOUTH PLATTE RIVER 4,680 4,680 4,670 - 37TH STREE- ; 4,670 4,660 4,660 ? 4,650 -te - ` 4,650 LL ''- • 4,640 4,640 J 4,630 �- - .. . - 4,630 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,620 4 4,620 LEGEND CHANCE FLOOD 0.2% ANNUAL -•-••-••-••- "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD - 4,610 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD w, STREAM BED 0 CROSS SECTION LOCATION 4,600 1,423,000 1,424,000 1,425,000 1,426,000 1,427,000 1,428,000 1,429,000 1,430,000 1,431,000 1,432,000 1,433,000 1,434,000 1,435,000 1,436,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 106P —4,710 FLOOD PROFILES SOUTH PLATTE RIVER 4,710 4,700 4,700 0 a 0 W s. HIGHWAY 8� ACCESS ROAD ACCESS ROA WEIR 4,690 4,690 - - 4,680 4,680 a zX4,670 4,670 i- f • _ 4,660 a 4,660 - . : f- 4,650 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,650 4,640 4,640 - LEGEND 0.2% ANNUAL CHANCE FLOOD i • • - • • - ' ' - • - "1%1' ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 4,630 - — • — — ' - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD AB /tc\ STREAM BED CI CROSS SECTION LOCATION 4,620 1,436,000 1,437,000 1,438,000 1,439,000 1,440,000 1,441,000 1,442,000 1,443,000 1,444,000 1,445,000 1,446,000 1,447,000 1,448,000 1,449,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 107P 4,720 FLOOD PROFILES SOUTH PLATTE RIVER 4,710 3 4,720 4,700 0 ce d W O La Li 4,710 4,690 0 U — 4,700 ? 4,680 4,690 w—r� u.f 4,670• �_ -- � -4,680 w w _ 4,670 4,660 �,. {�, FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,650 �/ 4,660 4,650 LEGEND 0 2% ANNUAL CHANCE FLOOD - • . - • • - • ' - • • - "1%1-" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,640 2% ANNUAL CHANCE FLOOD - - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD ,~wsSTREAM BED CROSS SECTION LOCATION CI 4,630 - 1,449,000 1,450,000 1,451,000 1,452,000 1,453,000 1,454,000 1,455,000 1,456,000 1,457,000 1,458,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1,459,000 1,460,000 1,461,000 1,462,000 1 08P 4,700 4,695 4,690 4 685 4,680 Lu z_ z O 4,675 w J W 4,670 4,665 4,660 4,655 1,456,000 4,700 4,690 4,685 FLOOD PROFILES SOUTH PLATTE RIVER 0NFLUENCE 0 THOMPSON RE' 4 4,670 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,665 LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION -••-••-••-••- "1%+" ANNUAL 1% ANNUAL CHANCE - - - 2% ANNUAL CHANCE - - • - - - - 4%ANNUAL CHANCE - - 10% ANNUAL CHANCE r� STREAM BED 0 CROSS SECTION 1,456, 500 1,457, 000 1,457,500 1,458, 000 1,458, 500 1,459,000 1,459, 500 1,460,000 1,460, 500 1,461, 000 1,461,500 1,462,000 1,462,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1 09P 4,710 FLOOD PROFILES SOUTH PLATTE RIVER 4,705 - RAILROAD •4,710 4,705 4,700 i 1 I 4,700 4,695 - �r , - - 4,695 > �. - - �, .. 4,690 - -- _ �- _ -_- - ' {. 4,690 _ - �. Lu IL - ---- z- - �� r -r _J--- _ -, 4,685 _._.- w J W ____ -^ 4,685 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,680 . . 4,680 4,675 r 4,675 LEGEND CHANCE 0.2% ANNUAL FLOOD - • • - • • - • - - • • - "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,67O 2% ANNUAL CHANCE FLOOD - - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD imowt,STREAM BED CI)) CROSS SECTION LOCATION 4,665 1,462,500 1,463,000 1,463,500 1,464,000 1,464,500 1,465,000 1,465,500 1,466,000 1,466,500 1,467,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1,467,500 1,468,000 1,468,500 1,469,000 11 OP 4,720 4,720 FLOOD PROFILES SOUTH PLATTE RIVER 4,715 4,715 4,710 4,710 4,705 4,705 ------------- - � __rte r -- a — Z 4,700 -� - r ---- -r� 4,700 4,695 ''.a..'.. �` -- -- - �__ 4,695 Lii Li 4,690 _ 4,690 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,685 AG 4 4,685 LEGEND CHANCE FLOOD 0.2% ANNUAL -••-••-••-••- ^1%+^ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD O 0 4,68 - 2% ANNUAL CHANCE FLOOD - - - - • - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD AE �� STREAM BED CROSS SECTION LOCATION 4,675 1,469,000 1,469,500 1,470,000 1,470,500 1,471,000 1,471,500 STREAM DISTANCE 1,472,000 IN FEET 1,472,500 ABOVE CONFLUENCE 1,473,000 WITH PLATTE 1,473,500 RIVER 1,474,000 1,474,500 1,475,000 1,475,500 111P 4,725 4,725 FLOOD PROFILES SOUTH PLATTE RIVER 4,720 4,720 4,715 4,715 - - 4,710 ~", r - -4,710 14705 ... �r- �- -` �- - - LU LU 0 4,700 -� ~0 - - _:_ _- 4,705 4,700 W J W 4,695 3 4,695 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,690 - U.S. ROUTE 60 AFK 4,690 LEGEND 0.2% ANNUAL CHANCE FLOOD - • • -' • - • • - . • - "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD C 4,685 2% ANNUAL CHANCE FLOOD !lH AI AJ - - - - - - - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED � l CROSS SECTION LOCATION f JJ � 4,680 1,475,500 1,476,000 1,476,500 1,477,000 1,477,500 1,478,000 STREAM DISTANCE 1,478,500 IN FEET 1,479,000 ABOVE CONFLUENCE 1,479,500 WITH PLATTE 1,480,000 RIVER 1,480,500 1,481,000 1,481,500 1,482,000 112P 4,735 4,735 FLOOD PROFILES SOUTH PLATTE RIVER 4,730 4,730 4,725 w . 4,725 4,720 4,720 . f - rfi -� r te- _ .. f' rr'�. ? 4,715 L---�- �- -. r 4,715 - w � .Y-�-�„{ _ _ _ _-_� Lu 4,710 4,710 w d 4,705 ------ 4,705 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS ,N 4,700 "" 4 4,700 r LEGEND 0.2% ANNUAL CHANCE FLOOD - • - • • - • • - - • - "1%+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,695 2% ANNUAL CHANCE FLOOD V .l - - - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD AL 4 Y� STREAM BED CCROSS SECTION LOCATION 4,690 1,482,000 1,482,500 1,483,000 1,483,500 1,484,000 1,484,500 1,485,000 1,485,500 1,486,000 1,486,500 1,487,000 1,487,500 1,488,000 1,488,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1113P 4,740 4,735 4,730 4,725r z 4,720 w z z O ?4,715 w J W 4,710 4,705 4,700 4,695 1,488,500 4,740 4,735 4,730 4,725 4,720 4,715 4,710 FLOOD PROFILES SOUTH PLATTE RIVER - - - - - - '- .+- r- --_- _ _ - r - - 1� - - - - ..... Y Y -- r �_ . r - --__ i - r .�;'? :,,• - • • FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS • 4,705 LEGEND CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION - • • - . • - . - 0.2% ANNUAL - ' - - "1%+^ ANNUAL 1%ANNUAL CHANCE - 2% ANNUAL CHANCE - 4% ANNUAL CHANCE - 10% ANNUAL CHANCE AO AP STREAM BED CCROSS SECTION 1,489,000 1,489,500 1,490,000 1,490,500 1,491,000 1,491,500 1,492,000 1,492,500 1,493,000 1,493,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1,494,000 1,494,500 1,495,000 114P 4,750 4,745 4,740 4,735 Q ? 4,730 j 4,725 w J W 4,720 4,715 4,710 4,750 FLOOD PROFILES SOUTH PLATTE RIVER 4,745 4,740 -. ' 4,735 r � - . - y . Y -- r 4,730 -- _ 4,725 ffr .rA FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS . . AS --- 4,720 4,715 -- - LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION -••-••-••-••- "1%+" ANNUAL - - 1% ANNUAL CHANCE 2% ANNUAL CHANCE - - • - - • - 4%ANNUAL CHANCE - - 10%ANNUAL CHANCE w STREAM BED CI1 CROSS SECTION 4,705 1,495,000 1,495,500 1,496,000 1,496,500 1,497,000 1,497,500 1,498,000 1,498,500 1,499,000 1,499,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1,500,000 1,500,500 1,501,000 1,501,500 115P 4,760 4,755 4,750 4,745 ? 4,740 4,735 w w 4,730 4,725 4,720 4,715- 1,501,500 4,760 4,755 4,750 4,745 4,740 4,735 4,730 FLOOD PROFILES SOUTH PLATTE RIVER I I I ..- Y-- - ..... - -`! �' r -- '-- -- -� FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS - -- AV 4,725 LEGEND 0.2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION -••-••-••-••- 'l%+"ANNUAL 1% ANNUAL CHANCE 2% ANNUAL CHANCE • - 4% ANNUAL CHANCE - 10% ANNUAL CHANCE - - - • - - - AT �! I 4/ `i/l, STREAM BED CI CROSS SECTION 1,502,000 1,502,500 1,503,000 1,503,500 1,504,000 1,504,500 1,505,000 1,505,500 1,506,000 1,506,500 1,507,000 1,507,500 1,508,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 116P 4,770 4,765 4,760 4,755 O 4,750 w a 4,745 Lu 4,740 4,735 4,730 -- 4,770 FLOOD PROFILES SOUTH PLATTE RIVER 4,765 '4,760 4,755 4,750 - -y — '�-rr '` - 4,745 _ - 4,740 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS - - - - — 4,735 LEGEND 0_2% ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION - • • - • • - • • - • • - '1 %+^ ANNUAL I% ANNUAL CHANCE _... - 2% ANNUAL CHANCE - T • - - ••-� 4% ANNUAL CHANCE - - 10% ANNUAL CHANCE AW q)( STREAM BED CCROSS SECTION 4,725 1,508,000 1,508,500 1,509,000 1,509,500 1,510,000 1,510, 500 1,511, 000 1,511, 500 1,512, 000 1,512,500 1,513,000 1,513,500 1,514,000 1,514,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 117P 4,775 4,775 FLOOD PROFILES SOUTH PLATTE RIVER 4,770 ac Id iii cc o -- 4,770 4,765 E OF ST. VRAU f _- , 4,765 4,760 CONFLUEN NOTE: 1% PROFILES ARE AND 1%+ AN TOO CLOS: UAL CHANCL FLOOD TO STOW SEPARATELY --------"T_ t rrrr err r ---- _-r` r` 4,760 O > F-4,755 - - - r r--r� .-- r - _ - 1 �r 1 r r ~ rrr r r - r _ 4,755 Lu Lr LI--------,71--7- z z 4,750 r r r ----------------r ` r f r rr _ 4,750 W _ I 4,745 rrr rl- rrr-- rr1' . rr - - - -- [� w - 4,745 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,740 _.._. 6A 4 4,740 LCGCND 0.2% ANNUAL CHANCE FLOOD - - -� - - "195+' ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,735 2% ANNUAL CHANCE FLOOD r'------ - • - 4%ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD 8 Az "ASgckokk,STREAM BED � Y CROSS SECTION LOCATION 4,730 1,511,000 1,512,000 1,513,000 1,514,000 1,515,000 1,516,000 STREAM DISTANCE 1,517,000 IN FEET 1,518,000 ABOVE CONFLUENCE 1,519,000 WITH PLATTE 1,520,000 RIVER 1,521,000 1,522,000 1,523,000 1,524,000 11 8P 4,805 4,805 FLOOD PROFILES SOUTH PLATTE RIVER 4,800 4,800 4,795 4,795 4,790 NOT PROFIL : 1% AND 1%+ S ARE TOO CLOSE ANNUAL CHANCE TO SHOW FLOOD SEPARATELY 4,790 4,785 4,785 w w w z a 4,780 1�� f _`. 4,780 _ 4,775 l) 32.5 4,775 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS /� 4,770 r �� r ,, r rr- COUNTY RO/ 4,770 _�- 1. LEGEND CHANCE 0.2% ANNUAL FLOOD —••—••—••—••— "1°/n+" ANNUAL CHANCE FLOOD — — 1% ANNUAL CHANCE FLOOD FLOOD 4,765 2% ANNUAL CHANCE - - - - - ' - 4% ANNUAL CHANCE FLOOD — — 10% ANNUAL CHANCE FLOOD BB BC STREAM BED i n' CROSS SECTION LOCATION 4,760 1,524,000 1,525,000 1,526,000 1,527,000 1,528,000 1,529,000 1,530,000 1,531,000 1,532,000 1,533,000 1,534,000 1,535,000 1,536,000 1,537,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 118(a)P 4,820 4,820 FLOOD PROFILES SOUTH PLATTE RIVER 4,815 4,815 4,810 4,810 4,805 NOTE: PROFILE 1% AND 1%-i- A ARE TOO CLOSE 'JNUAL CHANCE TO SHOW SEPARATELY FLOOD - . 4,805 _�f_ l fl l4,800 4,800 w LU z o 4,795�r—_ - 4,795 War 4,790 r `1 r r FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,785 � j! r U STA-E HIGHWAY 66 BG 4,790 LEGEND - - - - - - - 0.2°h ANNUAL CHANCE FLOOD - • • - • • - • • - • • - •1 %+" ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD p 4,70 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD BD IBE 6F <kw ` STREAM BED 0 CROSS SECTION LOCATION 4,775 1,537,000 1,538,000 1,539,000 1,540,000 1,541,000 1,542,000 STREAM DISTANCE 1,543,000 IN FEET 1,544,000 ABOVE CONFLUENCE 1,545,000 WITH PLATTE 1,546,000 RIVER 1,547,000 1,548,000 1,549,000 1,550,000 118(b)P r 4,840 4,840 FLOOD PROFILES SOUTH PLATTE RIVER 4,835 co4,835 4,830 a O cr z 8_ 4,830 4,825 NOTE; 1% PROFILES ARE AND 1 %+ ANNUAL TOO CLOSE TD CHANCE FLOOD SHOW SEPARATELY . . r. 4,825 a 4,820 - - - - - r r rrrr- rf / rr r 4,820 Ui Lu z :: rx r rr r- Q 4,815 rrr� -. 4,815 a W J w 4,810 r_ ......_____,_.----•`-----,:----__---0` r --- f i - - 4,810 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,805 { 4 4,805 4,805 - _ - - LEGEND 0.2%ANNUAL CHANCE FLOOD ► -'--''-'---•- "1%ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,800 2%ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD BH I BI�' STREAM BED r h 1 CROSS SECTION LOCATION 4,795 1,550,000 1,551,000 1,552,000 1,553,000 1,554,000 1,555,000 1,556,000 1,557,000 1,558,000 1,559,000 1,560,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1,561,000 1,562,000 1,563,000 11 8(c)P 4,860 4 --- w w - -4 NOTE: PROFILES 1%AND 1%+ANNUAL ARE TOO CLOSE CHAVCE TO SHOW FLOOD SEPARATELY r 1r •-•. r — err y lrr` r r J rr r_ 1 r { de r le BM 1 / k LEGEND CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION 0.2% ANNUAL -••-••-••-••- "1%+" ANNUAL - 1% ANNUAL CHANCE 2% ANNUAL CHANCE - - . - - - - 4% ANNUAL CHANCE 10% ANNUAL CHANCE 0 DL STREAM BED CROSS SECTION ,860 4,855 ,855 4,850 ,850 4,845 O ? 4,840 I w w u_ z z O 4,835 4,830 4,825 4,820 4,815 1,563,000 1,564,000 1,565,000 1,566,000 1,567,000 1,568,000 1,569,000 1,570,000 1,571,000 1,572,000 1,573,000 1,574,000 1,575,000 ,845 ,840 ,835 ,830 4,825 1,576,000 FLOOD PROFILES SOUTH PLATTE RIVER EMERGENCY MANAGEMENT AGENCY w LL WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 118(d)P 4,875 4,875 FLOOD PROFILES SOUTH PLATTE RIVER 4,870 4,870 4,865 WEIR 1{fir r r r { 4,865 4,860 - - -- - — - - - - - - - _------ /. r r _____-- - 4,860 ❑ NOT PROFIL : 1% AND 1%-F S ARE TOO CLOSE ANNUAL CHANCE TO SHOW FLOOD SEPARATELY f r�r1 _- -- r�rr r r 'rf r ? 4,855 4,855 LuLu z�- o 4,850 fr{ f �� --- {f. 4,850 4,845 r r r r f��` 4,845 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,840 4 4,840 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-•••-'-•-•"-- "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 4,835 2% ANNUAL CHANCE FLOOD - - - - - - - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD 8!V 84 BP r`y�t STREAM BED CI CROSS SECTION LOCATION 4,830- 1,576,000 1,577,000 1,578,000 1,579,000 1,580,000 1,581,000 1,582,000 1,583,000 1,584,000 1,585,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 1,586,000 1,587,000 1,588,000 1,589,000 118(e)P 4,895 4,895 FLOOD PROFILES SOUTH PLATTE RIVER 4,890 4,890 4,885 OUNTY ROAD -I ...,,-----'..-------:----5-----------: 4,885 � 1 1r err ....a f I 4,880 � 4,880 _ t� F... 4,875 NOTE: 'PROFILES 1 % AND 1 °/u+ ANNUAL ARE TOO CLOSE CHANCE TO SHOW SEPARATELY FLOOD rf - r r- r r rrr ff {J �r r i ; 4,875 U.J- UJ 1 ~-- rr - - - �r�-I - 4,870 14,870 w w 4,865 4,865 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,860 - BT.. 4 4,860 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-..-••-- •- "1%+" ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD O55 4,8 2% ANNUAL CHANCE FLOOD - - r • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD BQ \/ BR BS „ftwt, STREAM BED 0 CROSS SECTION LOCATION 4,850 1,589,000 1,590,000 1,591,000 1,592,000 1,593,000 1,594,000 STREAM DISTANCE 1,595,000 IN FEET 1,596,000 ABOVE CONFLUENCE 1,597,000 WITH PLATTE 1,598,000 RIVER 1,599,000 1,600,000 1,601,000 1,602,000 118 f)P 4,915 4,915 FLOOD PROFILES SOUTH PLATTE RIVER 4,910 - 4,910 4,905 14TH STREET WEIR 4,905 .--:,---- r rrf - 4,900 1 --� 4,900 ? 4,895 _ NOTE: 11. AND 1%+ ANNUAL E TOO CLOSE CHANCE FLOOIJ. TO SHOW SEPA,RATELY r-- 4,895 W W W 4,890 _ r 1r rr f -- �- -� � 4,890 J W 4,885 r r r ter- r r -- - --- - -- f 4,885 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,880 N BRIDGE HWAY 52 BX 4,880 ''EIESTRIi STATE H I LEGEND 0.296 ANNUAL CHANCE FLOOD - • • - • • - • • - • • - ^156+' ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 4,875 2%ANNUAL CHANCE FLOOD -, -^ • - - ^-- 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD { J BU BV t.‘,,.,, tk STREAM BED 0 CROSS SECTION LOCATION 4,870 1,601,000 1,602,000 1,603,000 1,604,000 1,605,000 1,606,000 1,607,000 1,608,000 1,609,000 1,610,000 1,611,000 1,612,000 1,613,000 1,614,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 118(g)P 4,940 4,940 FLOOD PROFILES SOUTH PLATTE RIVER 4,935 4,935 4,930 COUNTY ROAD 4,930 4,925 J 4,925 D 4,920 NOTE 1% PROFILES AND 1%+ ANNUAL ARE TOO CLOSE CHANCE TO SHOW SE FLOOD ARATELY I 'rr -. �1 �- Jr`rr Y 4,920 LU Z1r Z O 4,915f ~ r rr ...--:>:-:_"..- f fr rr r r rU. r 4,915 W r rrr r r +.l r A A411 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS -rte rr 4,0 Ili 4,905 rrf -- rrr -Y` f -rr j 4,905 LECEND 02% CHANCE FLOOD ANNUAL - - - - - - - - "1%4" ANNUAL CHANCE FLOOD ^ - 1% ANNUAL CHANCE FLOOD 4,900 2%ANNUAL CHANCE FLOOD - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD BY 8Z CA ~...,,m, STREAM BED 0 CROSS SECTION LOCATION 4,895 1,614,000 1,615,000 1,616,000 1,617,000 1,618,000 1,619,000 STREAM DISTANCE 1,620,000 IN FEET 1,621,000 ABOVE CONFLUENCE 1,622,000 1,623,000 WITH PLATTE RIVER 1,624,000 1,625,000 1,626,000 1,627,000 118(h)P 4,955 4,955 FLOOD PROFILES SOUTH PLATTE RIVER 4,950 4,950 4,945 x w 4,945 4,940 4,940 NOTE: 70 AND 1%+ ANNUAL CHANCE FLOOD - -- � _ ,� ? 4,935 PROFILES ARE TOO CLOSE TO SHOW SEFARATELY - r `'* �! �._____ - ^` ~- - 4,935 LJI w 4,930 r�� r rr -- - 4,930 W f r 4,925 -�EZ - FT��-� r r r Lii 4,925 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,920 -r_ o CONVEYORS 4,920 COUNTY RO LEGEND 02% ANNUAL CHANCE FLOOD -••-••-••-••- "1%+" ANNUAL CHANCE FLOOD i - - 1% ANNUAL CHANCE FLOOD 4,915 C - 2% ANNUAL CHANCE FLOOD - - - - 4% ANNUAL CHANCE FLOOD - 10% ANNUAL CHANCE FLOOD CC CD 4A\\ STREAM BED CROSS SECTION LOCATION 4,910 1,627,000 1,628,000 1,629,000 1,630,000 1,631,000 1,632,000 1,633,000 STREAM DISTANCE IN FEET 1,634,000 ABOVE CONFLUENCE 1,635,000 WITH PLATTE 1,636,000 RIVER 1,637,000 1,638,000 1,639,000 1,640,000 11 S(I)P 4,965 FLOOD PROFILES SOUTH PLATTE RIVER 4,965 4,960 4,960 4,955 I 4,955 4,950 NOTE PROFILES 1%AND 1%+- ARE TOO CLOSE ANNUAL CHANCE TO SHOW FLOOD SEPARATELY ..,- r >- 3-- D - c . . 4,950 a 7 ? r y 168TH AVENUE 'UNTY B0UNDA OF DETAILED S 4,945 - 4,945 W 4,940 -, u Uw _ 4,940 ; w II ,-----<---7:---' -� 4,935 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 4,935 - - --- • 4,930 LEGEND FLOOD 0.2% ANNUAL CHANCE -••-••-••-••- "l%+"ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD - 2% ANNUAL CHANCE FLOOD 4,925 - - • - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD a GH CI CJ WSTREAM BED 1 CROSS SECTION LOCATION 4,920 1,640,000 1,641,000 1,642,000 1,643,000 1,644,000 1,645,000 1,646,000 1,647,000 1,648,000 1,649,000 1,650,000 1,651,000 1,652,000 1,653,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER 118(j}P A R�c 4,655 FLOOD PROFILES SOUTH PLATTE RIVER BREACH ELEVATION IN FEET (NAVD) a a N N coOb) . In O Cn O Cn 0 Ui p C \ CONFLUENCE WITH SOUTH PLATTE RIVER \ \ 4,650 IGHWAY 34 ui 4,645 4,640 HH 4,635 4,630 _ . l Jr r FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS f r 4,625 4,620 LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%+" ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 4,615 - 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD - - 10% ANNUAL CHANCE FLOOD A �r'W/We% STREAM BED CROSS SECTION LOCATION 4,610 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 5,500 6,000 6,500 11 8(k)P 4,655 4,655 4,650 4,645 4,640 ?. 4,635 w w u_ z z 0 4,630 4,625 4,620 4,615 4,610 0 LATTEE RIVER I U a U f I WITH SOUTH I.S. HIGHWAY 3I /ERGENCE FR DLATTE RIVER CONFLUENCE of I - a - - - - LEGEND ANNUAL CHANCE FLOOD CHANCE FLOOD FLOOD FLOOD FLOOD FLOOD LOCATION - . - . - - - - - - 0.2% - - - - '1%+" ANNUAL 1% ANNUAL CHANCE 2% ANNUAL CHANCE • - 4% ANNUAL CHANCE - 10% ANNUAL CHANCE - - I\ $ �/ - - - - - - 'feVti/� STREAM BED y j CROSS SECTION 1::::j 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 ,650 ,645 ,640 4,635 4,630 4,625 4,620 2,600 FLOOD PROFILES -J J 0 re W II- o_ O FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SOUTH PLATTE RIVER 118(I)P ELEVATION IN FEET (NAVD) 5060 5055 5050 5045 5040 5035 5030 5025 Ui L4 2 I—— - LEGEND 0 I r i i 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 STREAM DISTANCE IN FEET ABOVE WELD COUNTY ROAD 88 7,000 I.- U1 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 7,500 8,000 5060 5055 5050 5045 5040 5035 5030 5025 W J_ LL O rx 0 0 0 J LL SPRING CREEK FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 119P ELEVATION IN FEET (NAVD) 5050 5045 5040 5035 5030 LU' D z NOTE: THE 2910 AND 1 %ANNUAL !CHANCE FLOOD PROFILE IS TOO CLOSE TQ HE 0.2% - ANNUAL wHANCE FLOOD ELE AT1ON TQ BE SHOWN SEPARATELY. • ii -- 5025 5 5020 5015 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD "WAWA STREAM BED CROSS SECTION LOCATION 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CACHE LA POUDRE RIVER 5050 5045 5040 5035 5030 5025 5020 5015 FLOOD PROFILES SPRING CREEK OVERFLOW FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 120P ELEVATION IN FEET (NAVD) 5040 5035 5030 5025 5020 5015 5010 5005 5000 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 0 STREAM DISTANCE IN FEET ABOVE WELD COUNTY ROAD 88 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD "WAVA STREAM BED 5040 5035 5030 5025 5020 5015 5010 5005 6,500 LU J m ct aLU O O O O J Z U — DL FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 121P ELEVATION IN FEET (NAVD) 5195 5190 5185 5180 5175 5170 5165 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,000 4,500 5,000 5,500 0 1 1 . . . . . . . . 5195 5205 5190 5200 5185 5195 5175 5185 5170 5165 STREAM DISTANCE IN FEET ABOVE WELD COUNTY ROAD 98 • 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 5205 5200 5195 5190 5185 FLOOD PROFILES SPRING CREEK TRIBUTARY FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 122P ELEVATION IN FEET (NAV0) 4890 4880 4870 4860 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 0 STREAM DISTANCE IN FEET FROM 1000 FEET DOWNSTREAM OF GREAT WESTERN RAILROAD 4890 4880 4870 4860 6,500 LU J_ U- 0 Ce 0_ CI O J LL THE SLOUGH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 123P ELEVATION IN FEET (NAVD) 4900 4890 4880 • 7,000 7,500 8,000 8,500 9,000 LEGEND 02% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD "e"Y(A.\CQ' STREAM BED CROSS SECTION LOCATION 6,500 STREAM DISTANCE IN FEET FROM 1000 FEET DOWNSTREAM OF GREAT WESTERN RAILROAD 4900 4890 4880 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO THE SLOUGH AND INCORPORATED AREAS 124P ELEVATION IN FEET (NAVD) 4845 4840 4835 4830 4825 4820 4815 1,550 2,050 2,550 3,050 3,550 4,050 4,550 5,050 5,550 6,050 6,550 7,050 1,050 WITHOUT LEVEE' (GREAT WESTERN TRAIL): . ;WITH LEVEE (GREAT WESTERN TRAIL) i r STREAM DISTANCE IN FEET FROM ABOVE CONFLUENCE WITH JOHN LAW DITCH LEGEND 1% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4845 4840 4835 4830 4825 4820 4815 FLOOD PROFILES THE SLOUGH - BELOW JOHN LAW DITCH RESERVOIR FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 125P ELEVATION IN FEET (NAVD) 4860 4855 4850 4845 4840 4835 {GREAT WEST fITH LEVEE• SRN TRAIL} ' I WITHOUT LEVEE :(G# EAT WESTERN TRAIL) I 7,050 7,550 8,050 8,550 9,050 9,550 LEGEND 1% ANNUAL CHANCE FLOOD ie."\\*?~A STREAM BED u CROSS SECTION LOCATION STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH JOHN LAW DITCH 4860 4855 4850 4845 4840 FLOOD PROFILES THE SLOUGH - BELOW JOHN LAW DITCH RESERVOIR FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 126P ELEVATION IN FEET (NAVD) 725 925 1,125 1,325 1,525 1,725 1,925 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH THE SLOUGH - BELOW JOHN LAW DITCH RESERVOIR 4825 4820 4815 4810 4805 4800 4795 0r) W J_ LL O Ce 0_ 0 0 J LL fX O 1Y w U) W Ce I O I- Q J Z 2 O O J W CO 1- J d U) 2 U' D O J co W 2 H FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 127P ELEVATION IN FEET (NAVD) 4950 4945 4940 4935 4930 4925 4920 r. X F 7 _ F r r r / . i LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD AVANY /Q` STREAM BED CROSS SECTION LOCATION -2,800 -2,600 -2,400 -2,200 -2,000 -1,800 -1,600 -1,400 -1,200 STREAM DISTANCE IN FEET ABOVE COUNTY ROAD 18 (GRANT AVENUE) -1,000 -800 -600 4950 4945 4940 4935 4930 4925 4920 FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO TRI-AREA DRAINAGEWAY AND INCORPORATED AREAS 128P ELEVATION IN FEET (NAVD) 4950 4945, 4940 4935 I : • i • • . .i • F -800 -600 -400 -200 0 STREAM DISTANCE IN FEET ABOVE COUNTY ROAD 18 (GRANT AVENUE) LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOO❑ 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4950 4945 4940 4935 FLOOD PROFILES TRI-AREA DRAINAGEWAY FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 129P m Inj ELEVATION IN FEET (NAVD) 4955 O 8 w 1 W 0 0 co 4950 - -- - 4945 4940 4935 J i • _ • i .1.. ! I.- 4960 4955 4950 4945 i I: LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD AWk\"'NelA STREAM BED CROSS SECTION LOCATION 0 4940 4935 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 STREAM DISTANCE IN FEET ABOVE COUNTY ROAD 18 (GRANT AVENUE) FLOOD PROFILES TRI-AREA DRAINAGEWAY FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 130P ELEVATION IN FEET (NAVD) 4965 4960 4955 4950 4945 2,800 3,000 3,200 3,400 3,600 3,800 4,000 4,200 4,400 4,600 4,800 5,000 2,600 STREAM DISTANCE IN FEET ABOVE COUNTY ROAD 18 (GRANT AVENUE) 2%, i °feANDC,2% ANNUAL CHANCE, FLOODS 4965 4960 4955 4950 4945 5,200 FLOOD PROFILES TRI-AREA DRAINAGEWAY FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 131P ELEVATION IN FEET (NAVD) 4980 4975 4970 4965 4960 4955 2%, 1% AND •0 2°lc ANNUAL CHANCE. FLOODS COINCIDE 1.0 6, 2%,.1% AND 0 2% AIJNUAL CHANCE FLOODS_ COINCIDE. _ U, : • W C) p0 • I I • LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD A'1,,"~ STREAM BED CROSS SECTION LOCATION 5,200 5,400 5,600 5,800 6,000 6,200 6,400 6,600 6,800 7,000 7,200 7,400 7,600 STREAM DISTANCE IN FEET ABOVE COUNTY ROAD18 (GRANT AVENUE) 4980 4975 4970 4965 4960 4955 FLOOD PROFILES FEDERAL EMERGENCY MANAGEMENT AGENCY TRI-AREA DRAINAGEWAY WELD COUNTY, CO AND INCORPORATED AREAS 132P ELEVATION IN FEET (NAVD) 7,600 7,800 8,000 8,200 8,400 8,600 8,800 9,000 9,200 STREAM DISTANCE IN FEET ABOVE COUNTY ROAD 18 (GRANT AVENUE) 9,400 9,600 4985 LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD "Y(/Q1` STREAM BED 9,800 CROSS SECTION LOCATION 10,000 10,200 FLOOD PROFILES L7 cc FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 1 33P ELEVATION IN FEET (NAVD) 5005 5000 w' a 4995' 4990 • -2 10,600 10,800 11,000 11,200 I I i LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD %1v \YA STREAM BED CROSS SECTION LOCATION 10,200 10,400 STREAM DISTANCE IN FEET ABOVE COUNTY ROAD 18 (GRANT AVENUE) 5005 5000 4995 4990 FLOOD PROFILES RI -AREA DRAINAGEWAY FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 134P ELEVATION IN FEET (NAVD) 4860 4855 4850 400 800 0 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SHEEP DRAW LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD "OW STREAM BED CROSS SECTION LOCATION 4860 4855 4850 D7 W LL 0 O. Ca 0 J LL U.S. HIGHWAY 34 BYPASS SPLIT FLOWPATH FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 135P ELEVATION IN FEET (NAVD) 5205 5200 5195 5190 5185 W, . .,. ... . . /• r,. 1. , ff r • I i I i LEGEND 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD WY// `�(f STREAM BED CROSS SECTION LOCATION 0 500 1,000 1,500 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SPRING CREEK TRIBUTARY 5205 5200 5195 5190 5185 FLOOD PROFILES WESTERN FLOW PATH TO SPRING CREEK TRIBUTARY FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS 136P Hello