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Home My WebLink About20201146.tiffFederal Emergency Management Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Scott James Chair, Weld County Board of Commissioners P. O. Box 758 Greely, CO 80631 Dear Scott James: Washington, D.C. 20472 RECEIVED August 1, 2023 AUG 0 7 2023 IN REPLY REFER TO: WELD COMMISSIONERS COUNTY Case No.: 22-08-0435P Follows Conditional Case No.: 19-08-0699R Community Name: Weld County, CO Community No.: 080266 FIRM Panel Affected: 08123C 1683E, 08123C1684E 116 In a Letter of Map Revision (LOMR) dated March 8, 2023, you were notified of proposed flood hazard determinations affecting the Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for Weld County, CO. These determinations were for Little Thompson River - From approximately 230 feet downstream of County Road 46.5 to approximately 1,910 feet downstream of County Road 17. The 90 -day appeal period that was initiated on March 29, 2023, when the Department of Homeland Security's Federal Emergency Management Agency (FEMA) published a notice of proposed Flood Hazard Determinations in The Greely Tribune has elapsed. FEMA received no valid requests for changes to the modified flood hazard information. Therefore, the modified flood hazard information for your community that became effective on July 28, 2023, remains valid and revises the FIRM and FIS report that were in effect prior to that date. The modifications are pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public Law 93-234) and are in accordance with the National Hood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. The community number(s) and suffix code(s) are unaffected by this revision. The community number and appropriate suffix code as shown above will be used by the National Flood Insurance Program (NFIP) for all flood insurance policies and renewals issued for your community. FEMA has developed criteria for floodplain management as required under the above -mentioned Acts of 1968 and 1973. To continue participation in the NFIP, your community must use the modified flood hazard information to carry out the floodplain management regulations for the NFIP. If you have any questions regarding the necessary floodplain management measures for your community or the NFIP in general, please contact the Mitigation Division Director, FEMA Region VIII, in Denver, Colorado, either by telephone at (303) 235-4830, or in writing at Denver Federal Center, Building 710, Box 25267, Denver, Colorado, 80225. Co -s t o;co`+;onS O1C/21 /2.3 Cc :OEM (P,R), P L (TP/MN/DR's PW (CH /ER/DD) OW/1-7/23 .2020-11(-16 2 If you have any questions regarding the LOMR, the proposed flood hazard determinations, or mapping issues in general, please call the FEMA Map Information eXchange, toll free, at (877) 336-2627 (877- FEMA MAP). Sincerely, 6:V-4441 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration cc: Matt LeCerf Manager Town of Johnstown Tom Parko Director, Weld County Department of Planning Services Diana Aungst Planner, Weld County Department of Planning Services Kim Meyer, AICP Planning and Development Director Town of Johnstown Craig Campbell TF Johnstown Farms LP Greg V. Wolterstorff, P.E. Director of Natural Resources V3 Companies, Ltd. Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Tom Parko Marta Blanco CastaBo, GISP, CFM Flood Mapping Program Assistant Colorado Water Conservation Board Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection System Colorado Water Conservation Board Federal Emergency Management Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Scott James Chair, Weld County Board of Commissioners P. O. Box 758 Greely, CO 80631 Dear Scott James: Washington, D.C. 20472 March 8, 2023 IN REPLY REFER TO: Case No.: 22-08-0435P Follows Conditional Case No.: 19-08-0699R Community Name: Weld County, CO Community No.: 080266 Effective Date of This Revision: July 28, 2023 RECEIVED MAR 212023 WE COUNTY COMMISSIONERS The Flood Insurance Study Report (FIS) and Flood Insurance Rate Map (FIRM) for your community have been revised by this Letter of Map Revision (LOMR). Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals issued in your community. Additional documents are enclosed which provide information regarding this LOMR. Please see the List of Enclosures below to determine which documents are included. Other attachments specific to this request may be included as referenced in the Determination Document. If you have any questions regarding floodplain management regulations for your community or the National Flood Insurance Program (NFIP) in general, please contact the Consultation Coordination Officer for your community. If you have any technical questions regarding this LOMR, please contact the Director, Mitigation Division of the Department of Homeland Security's Federal Emergency Management Agency (FEMA) in Denver, Colorado, at (303)235 4830, or the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at baps: :::v,.teina.vo: lvotl insurance. Sincerely, Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration List of Enclosures: cc: Letter of Map Revision Determination Document Annotated Flood Insurance Rate Map Annotated Flood Insurance Study Report Matt LeCerf Manager Town of Johnstown Tom Parko Jr. Director, Weld County Department of Planning Services Diana Aungst Planner, Weld County Department of Planning Services Kim Meyer, AICP Planning and Development Director Town of Johnstown C oMM ufliC.- ttonS cc:OEM(mg PL(TP/µu/Dm), PW(cM/ER/DD) 04 10/23 oy/oH/13 Craig Campbell TF Johnstown Farms LP Greg V. Wolterstorff, P.E. Director of Natural Resources V3 Companies, Ltd. Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Marta Blanco Castaiio, LISP, CFM Flood Mapping Program Assistant Colorado Water Conservation Board Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection System Colorado Water Conservation Board 2020-1146 Page 1 of 5 Issue Date: March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP Follows Conditional Case No.: 19-08-0699R ° Federal Emergency Management Agency 4 Washington, D.C. 20472 l9ND EG, LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) EXCAVATION FILL BASE MAP CHANGES HYDRAULIC ANALYSIS FLOODWAY UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 080266 IDENTIFIER Johnstown Farms APPROXIMATE LATITUDE AND LONG TUDE: 40.323, -104.903 SOURCE: Other DATUM: NAD 83 ANNOTATED MAPPING ENCLOSURES . ANNOTATED STUDY ENCLOSURES TYPE: FIRM* NO.: 08123C1683E DATE: January 20, 2016 TYPE: FIRM NO.: 08123C1684E DATE: January 20, 2016 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 20, 2016 SUMMARY OF DISCHARGES TABLE: 2 Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REVISED REACH Little Thompson River - From approximately 230 feet downstream of County Road 46.5 to approximately 1,910 feet downstream of County Road 17 SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Little Thompson River No BFEs* BFEs* YES NONE No Floodway Floodway YES NONE Zone A Zone AE YES YES Zone X (Unshaded) Zone X (Shaded) YES NONE Zone A Zone A YES YES * BFEs - Base (1 -percent -annual -chance) Flood Elevations DETERMINATION This document provides the determination from the Department of Homeland Security's Federal Emergency Management Agency (FEMA) regarding a request for a Letter of Map Revision (LOMR) for the area described above. Using the information submitted, we have determined that a revision to the flood hazards depicted in the Flood Insurance Study (FIS) report and/or National Flood Insurance Program (NFIP) map is warranted. This document revises the effective NFIP map, as indicated in the attached documentation. Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community. This determination is based on the flood data presently available. The enclosed documents about this document, please contact the FEMA Mapping and Insurance eXchange toll free Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional https://www.fema.clovfilood-insurance. provide additional information regarding this determination. If you have any questions at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Information about the NFIP is available on our website at P.E., Branch Chief Branch Mitigation Administration 22-08-0435P 102 -I -A -C Patrick "Rick" F. Sacbibit, Engineering Services Federal Insurance and Page 2 of 5 1 Issue Date: March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP Oti4A..„....'\. t. Federal Emergency Management Agency Washington, D.C. 20472 <SND LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS REVISION CID Number: 080250 Name: Town of Johnstown, Colorado AFFECTED MAP PANEL AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT TYPE: FIRM* NO.: 08069C1410G DATE: January 15, 2021 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 15, 2021 PROFILE(S): 323P FLOODWAY DATA TABLE: 23 This determination is based on the flood data presently available. The enclosed documents about this document, please contact the FEMA Mapping and Insurance eXchange toll Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional https://www.fema.gov/flood-insurance. provide additional information regarding this determination. If you have any questions free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Information about the NFIP is available on our website at --'' P.E., Branch Chief Branch and Mitigation Administration 22-08-0435P 102 -I -A -C 4CiPatrick "Rick" F. Sacbibit, Engineering Services Federal Insurance Page 3 of 5 Issue Date: March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP ° Federal Emergency Management Agency Washington, D.C. 20472 j9 ND 5EG LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) COMMUNITY INFORMATION APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION We have made this determination pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (P.L. 93-234) and in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, P.L. 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. Pursuant to Section 1361 of the National Flood Insurance Act of 1968, as amended, communities participating in the NFIP are required to adopt and enforce floodplain management regulations that meet or exceed NFIP criteria. These criteria, including adoption of the FIS report and FIRM, and the modifications made by this LOMR, are the minimum requirements for continued NFIP participation and do not supersede more stringent State/Commonwealth or local requirements to which the regulations apply. We provide the floodway designation to your community as a tool to regulate floodplain development. Therefore, the floodway revision we have described in this letter, while acceptable to us, must also be acceptable to your community and adopted by appropriate community action, as specified in Paragraph 60.3(d) of the NFIP regulations. COMMUNITY REMINDERS We based this determination on the 1 -percent -annual -chance flood discharges computed in the ongoing preliminary study for your community without considering subsequent changes in watershed characteristics that could increase flood discharges. Future development of projects upstream could cause increased flood discharges, which could cause increased flood hazards. A comprehensive restudy of your community's flood hazards would consider the cumulative effects of development on flood discharges subsequent to the publication of the FIS report for your community and could, therefore, establish greater flood hazards in this area. Your community must regulate all proposed floodplain development and ensure that permits required by Federal and/or State/Commonwealth law have been obtained. State/Commonwealth or community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for construction or may limit development in floodplain areas. If your State/Commonwealth or community has adopted more restrictive or comprehensive floodplain management criteria, those criteria take precedence over the minimum NFIP requirements. We will not print and distribute this LOMR to primary users, such as local insurance agents or mortgage lenders; instead, the community will serve as a repository for the new data. We encourage you to disseminate the information in this LOMR by preparing a news release for publication in your community's newspaper that describes the revision and explains how your community will provide the data and help interpret the NFIP maps. In that way, interested persons, such as property owners, insurance agents, and mortgage lenders, can benefit from the information. This revision has met our criteria for removing an area from the 1 -percent -annual -chance floodplain to reflect the placement of fill. However, we encourage you to require that the lowest adjacent grade and lowest floor (including basement) of any structure placed within the subject area be elevated to or above the Base (1 -percent -annual -chance) Flood Elevation. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on our website at https://www.fema.aov/flood-insurance. Patrick 'Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0435P 102 -I -A -C Page 4 of 5 I Issue Date: March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I L0MR-APP otiyAAR T Federal Emergency Management Agency �Washington, D.C. 20472 1455 SOC LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO, please contact: Jeanine D. Petterson Director, Mitigation Division Federal Emergency Management Agency, Region VIII Denver Federal Center, Building 710 P.O. Box 25267 Denver, CO 80225-0267 (303) 235-4830 STATUS OF THE COMMUNITY NFIP MAPS We are processing a revised FIRM and FIS report for Weld County in our countywide format; therefore, we will not physically revise and republish the FIRM and FIS report for your community to incorporate the modifications made by this LOMR at this time. Preliminary copies of the countywide FIRM and FIS report, which present information from the effective FIRMs and FIS reports for your community and other incorporated communities in Weld County, were submitted to your community for review on March 23, 2022. We will incorporate the modifications made by this LOMR into the countywide FIRM and FIS report before they become effective. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on our website at httos://www.fema.cloy/flood-insurance. Patrick 'Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0435P 102 -I -A -C Page 5 of 5 Issue Date: March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP .0�YA�14 a ° Federal Emergency Management Agency Washington, D.C. 20472 4155506 LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) PUBLIC NOTIFICATION OF REVISION A notice of changes will be published in the Federal Register. This information also will be published in your local newspaper on or about the dates listed below, and through FEMA's Flood Hazard Mapping website at main.asp hftps://www.floodmaps.fema.gov/fhm/bfejtatusibfe_main.asp LOCAL NEWSPAPER Name: Greely Tribune Date: March 22, 2023 and March 29, 2023 Within 90 days of the second publication in the local newspaper, any interested party may request that we reconsider this determination. Any request for reconsideration must be based on scientific or technical data. Therefore, this letter will be effective only after the 90 -day appeal period has elapsed and we have resolved any appeals that we receive during this appeal period. Until this LOMR is effective, the revised flood hazard determination presented in this LOMR may be changed. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3901 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on our website at https://www.fema.gov/flood-insurance. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0435P 102 -I -A -C Table 2 — Summary of Discharges (Continued) REVISED Drainage Area 10 -Percent Flooding Source and Location (Square Miles) Annual Chance John Law Ditch- WCR 23 Flow Path At Confluence with Cache La Poudre River At River Station 3285 At River Station 3464 At River Station 3938 John Law Ditch — WCR 23 Flow Path (Continued) At River Station 4441 At River Station 4901 At River Station 5818 At River Station 7564 At River Station 8173 At River Station 9327 At River Station 9746 John Law Ditch— West Tributary At River Station 15590 At River Station 17435 John Law Ditch — Whitney Flow Path At Confluence with John Law Ditch — WCR 23 Flow Path DATA (Little Thompson River At Milliken At Approximately 900 feet downstream of County Road 17 Peak Discharges (cfs) 2 -Percent 1 -Percent 0.2 -Percent Annual Chance Annual Chance Annual Chance _-1 96 101 163 181 235 521 802 855 805 834 305 665 153 144 196 4,624 10,638 15,502 31,555 165.9 4,626 10,638 15,502 31,500 DATA REVISED BY LOMR /EFFECTIVE FEBRUARY Pumpkin Ridge Split Flow Path At Confluence with Sheep Draw St. Vrain Creek At State Highway 66 At Approximately 1,000 feet downstream of Weld County Road 13 St. Vrain Creek — Existing Lakes At Confluence with St. Vrain Creek 'Data Not Available --� 763 2,307 3,606 6,579 16,700 5,950 12,850 16,700 41,960 REVISED TO REFLECT LOMB EFFECTIVE: July 28, 2023 1, 2021 4,830 M N 0 4,830 MR July 28, e Ln 4,820 aj- co V Ili '- tasj 4,820 o o t c w Q O O CC CC CC � F W >- CC 0 J ° 4,810 4,810 v Z REVISED REACH Ct O co a. \i/ 2 a_ 4,800 0 0 4,800 o = o J - -- 4,790 4,790 - • --� - . L.1.1 • . --- .....- _� -- .------ • . 1.11 . . - _ -- _� - - U. -- _ _ - . • _ _; - _ - _ �_ - - `_,r. - - • . - -�- I- •�-- - -- _ ...... 1"- ..�� i .. r _' _• •_ O - ►� .� -�- . • '- - - ~ -' ✓ - - 4,780 4,780 --� _________-�--.. - w, --------------- __ W / i -, 4,770 z 4,770 �� w Q o w I U Q z W .. 0 z - 4,760 4 760 W LEGEND I - 0.2% CHANCE FLOOD ANNUAL § O • • • • "1°/04-" 0 - - • • - • • - ANNUAL CHANCE FLOOD >- 0 O a_ Z Et 1% ANNUAL CHANCE FLOOD l..L W O 1 W 2% ANNUAL CHANCE FLOOD 0 O 4,750 W 2 z - - - -•- 4% ANNUAL CHANCE FLOOD - W Ct O - 10% ANNUAL CHANCE FLOOD Q < Qz G STREAM BED w H CROSS SECTION LOCATION ❑ A W a_ 4,740 18,500 19,000 19,500 20,000 20,500 21,000 21,500 22,000 22,500 23,000 23,500 24,000 24,500 25,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BIG THOMPSON RIVER 323P NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 4 NORTH, RANGE 67 WEST AND TOWNSHIP 4 NORTH, RANGE 68 WEST. w Weld County Unincorporated Areas (Area Not Included) w.` _ z CHARLOTT ST i Weld County Weld County Unincorporated Areas (Area Not Included) (Area Not Included) S 1ST ST w aQ a_ WADAS r CT • DEE RD HOMESTEAD LN TERRITORY LN -J 0 0 0 W 8 CENTENNIA Z > 0 < g RIVIERA LN LA COSTA LN DEE RD FRONTIER LN I HERITAGE J CASTLE PINES AVE REVISED AREA C;) Town of Johnstown 080250 srel�6' Sr 46 ca cp 03 03 .9 46) 9 4782.1 Bridge 17 0 C)N- I 17 Little Thompson River ZONE AE Bridge \\� oo ZONE AE Unincorporated Areas SPECIAL FLOOD HAZARD AREAS FOR WELD COUNTY SHOWN FOR PLANNING PURPOSES ONLY. Little Thompson River ZONE AE Weld County ZONE Unincorporated Areas — AE (Area Not Included) -4 tO Bridge .es Weld County Unincorporated to 00 s‘. Areas c (Area Not C� G4nc1uded) 16 Weld County Unincorporated Areas (Area Not Included) SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD Without Base Flood Elevation (BFE) Zone A. V.499 With BFE or Depth Zone AE AO, AB. VE, AR Regulatory Floodway 0.2 % Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Future Conditions 1% Annual Chance Flood Hazard Area with Reduced Flood Risk due to Levee See Notes. ,.N,, SCALE 1 N Map Proiecton: Universal Transverse MercatorNAD 1983 UTM Zone 13N Western Hemisphere, Vertical Datum: NAVD 88 1 inch = 1,000 feet 1:12,000 0 0 500 125 1 000 250 2,000 Feet Meters 500 NATIONAL FLOOD INSURANCE PROGRAM E r LOOD INSURANCE RATE MAP '0.0 LARIMER COUNTY, COLORADO 0 W Pm' U U) ›r 0 0 I a D and Incorporated Areas PANEL 1410 0l- 1420 Panel Contains: COMMUNITY NUMBER PANEL JOHNSTOWN, TOWN OF 080250 1410 [AMA REVISED TO REFLECT LOMR EFFECTIVE: July 28, 2023 SUFFIX VERSION NUMBER 2.5.3.6 MAP NUMBER 08069C1410G MAP REVISED JANUARY 15. 2021 co r Z (I) z NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 4 NORTH, RANGE 67 WEST. SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD Without Base Flood Elevation (BEE) With BFE or Depth mrreAeAO. AH,VE.A1, Orr Regulatory Floodway 0.2 % Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Future Conditions 1% Annual Chance Flood Hazard Area with Reduced Flood Risk due to Levee See Notes. SCALE 1 N Imagery Source NAIP 201 Map Projection: Universal Transverse MercatorNAD 1983 UTM Zone 13N Western Hemisphere: Vertical Datum: NAVD 88 1 inch - 500 feet 16.000 0 250 62.5 125 500 Meters 250 1 000 Feet ra4 NATIONAL FLOOD INSURANCE PROGRAM FLOOD ' ?ANCE P tE rt•" WELD COUNTY, COLORADO and Incorporate() Areas PANEL 1683 or 2250 Panel Contains: FEM A COMMUNITY NUMBER PANEL SUFFIX WELD COUNTY 080266 1683 REVISED TO REFLECT LOMR EFFECTIVE: July 28, 2023 VERSION NUMBER 1.1.1.0 MAP NUMBER 08123C1683E EFFECTIVE DATE JANUARY 20. 2016 Weld County Unincorporated Areas 080266 46 1/2] 4464000mN SPECIAL FLOOD HAZARD AREAS FOR THE TOWN OF JOHNSTOWN SHOWN FOR PLANNING PURPOSES NS PANEL 1683 O ZONEAE 3 LIMIT OF DETAI LED STUDY Weld County 16 Unincorporated Areas 080266 Weld Count Lf n:infforpprated SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD SCALE N 080266 REVjjSE AAREA ohlnsto* n Without Base Flood Elevation (BFE) With BEE or Depth Zone AE AO, AN, VE,AR Regulatory Floodway 0.2 % Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Future Conditions 1% Annual Chance Flood Hazard Area with Reduced Flood Risk due to Levee See Notes. zu,«x Imagery Source NAIL' 9^ Map Projection: Universal Transverse MercatorNAD 1983 UTM Zone 13N Western Hemisphere: Vertical Datum: NAVD 88 1 inch = 500 feet 625 125 1:6,000 Meters 250 1.000 Feet NATIONAL FLOOD INSURANCE PROGRAM FLOOD IPN`SI;P'!NIrE RATE M P WELD COUNTY, COLORADO and Incorporated Areas PANEL 1684 or 2250 Panel Contains. COMMUNITY NUMBER PANEL SUFFIX MILLIKEN, TOWN OF 08(1.87 L68.1 E WELD COUNTY 080266 1681 E REVISED TO REFLECT LOMR EFFECTIVE: July 28, 2023 VERSION NUMBER 1.1.1.0 MAP NUMBER 08123C1684E EFFECTIVE DATE JANUARY 20, 2016 Federal Emergency Management Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED Matt LeCerf Town of Johnstown Manager P. O. Box 609 Johnstown, CO 80534 Washington, D.C. 20472 March 8, 2023 IN REPLY REFER TO: Case No.: 22-08-0435P Follows Conditional Case No.: 19-08-0699R Community Name: Town of Johnstown, CO Community No.: 080250 Effective Date of This Revision: July 28, 2023 Dear Matt LeCerf: The Flood Insurance Study Report (FIS) and Flood Insurance Rate Map (FIRM) for your community have been revised by this Letter of Map Revision (LOMR). Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals issued in your community. Additional documents are enclosed which provide information regarding this LOMR. Please see the List of Enclosures below to determine which documents are included. Other attachments specific to this request may be included as referenced in the Determination Document. If you have any questions regarding floodplain management regulations for your community or the National Flood Insurance Program (NFIP) in general, please contact the Consultation Coordination Officer for your community. If you have any technical questions regarding this LOMR, please contact the Director, Mitigation Division of the Department of Homeland Security's Federal Emergency Management Agency (FEMA) in Denver, Colorado, at (303)235 4830, or the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at Lto\ 'flood „1 -,rance. Sincerely, 6'<-14/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration List of Enclosures: Letter of Map Revision Determination Document Annotated Flood Insurance Rate Map Annotated Flood Insurance Study Report The Honorable Scott James Chair, Weld County Board of Commissioners Kim Meyer, AICP Planning and Development Director Town of Johnstown Tom Parko Director, Weld County Department of Planning Services Diana Aungst Planner, Weld County Department of Planning Services Greg V. Wolterstorff, P.E. Director of Natural Resources V3 Companies, Ltd. Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Marta Blanco Castano, GISP, CFM Flood Mapping Program Assistant Colorado Water Conservation Board Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection System Colorado Water Conservation Board Craig Campbell TF Johnstown Farms LP Page 1 of 5 I Issue Date:,March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP Follows Conditional Case No.: 19-08-0699R [['' ° Federal Emergency Management Agency 4 Washington, D.C. 20472 61ND SEG� LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST COMMUNITY Town of Johnstown Larimer County Colorado EXCAVATION FILL BASE MAP CHANGES HYDRAULIC ANALYSIS FLOODWAY UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 08025O IDENTIFIER Johnstown Farms APPROXIMATE LATITUDE AND LONGITUDE: 40.323, -104903 SOURCE: Other DATUM: NAD 83 ANNOTATED MAPPING ENCLOSURE ANNOTATED STUDY ENCLOSURES TYPE: FIRM* NO.: 08069C1410G DATE: January 15, 2021 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 15, 2021 PROFILE(S): 323P FLOODWAY DATA TABLE: 23 Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REVISED REACH Little Thompson River - From approximately 230 feet downstream of County Road 46.5 to approximately 1,910 feet downstream of County Road 17 SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases Little Thompson River BFEs* BFEs* YES YES Floodway Floodway YES YES Zone AE Zone AE YES YES Zone X (Shaded) Zone X (Shaded) YES YES * BFEs - Base (1 -percent -annual -chance) Flood Elevations DETERMINATION This document provides the determination from the Department of Homeland Security's Federal Emergency Management Agency (FEMA) regarding a request for a Letter of Map Revision (LOMR) for the area described above. Using the information submitted, we have determined that a revision to the flood hazards depicted in the Flood Insurance Study (FIS) report and/or National Flood Insurance Program (NFIP) map is warranted. This document revises the effective NFIP map, as indicated in the attached documentation. Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community. This determination is based on the flood data presently available. The enclosed documents about this document, please contact the FEMA Mapping and Insurance eXchange toll free Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional https://www.fema.gov/flood-insurance. provide additional information regarding this determination. If you have any questions at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Information about the NFIP is available on our website at P.E., Branch Chief Branch Mitigation Administration 22-08-0435P 102 -I -A -C . Patrick "Rick" F. Sacbibit, Engineering Services Federal Insurance and Page 2 of 5 Issue Date:,March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP °, Federal Emergency Management Agency °� 4~ Washington, D.C. 20472 l9ND s5G� LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS REVISION CID Number: 080266 Name: Unincorporated Areas of Weld County, Colorado AFFECTED MAP PANELS AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT TYPE: FIRM* NO.: 08123C1683E DATE: January 20, 2016 TYPE: FIRM" NO.: 08123C1684E DATE: January 20, 2016 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 20, 2016 SUMMARY OF DISCHARGES TABLE: 2 This determination is based on the flood data presently available. The enclosed documents about this document, please contact the FEMA Mapping and Insurance eXchange toll Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional https://www.fema.qovglood-insurance. provide additional information regarding this determination. If you have any questions free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Information about the NFIP is available on our website at P.E., Branch Chief Branch and Mitigation Administration 22-OO-0435P 102 -I -A -C Patrick "Rick" F. Sacbibit, Engineering Services Federal Insurance Page 3 of 5 I Issue Date; March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP 0...../......,,,,,,,,,' h' O Federal Emergency Management Agency -.r' Washington, D.C. 20472 'ND s5 LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) COMMUNITY INFORMATION APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION We have made this determination pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (P.L. 93-234) and in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, P.L. 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. Pursuant to Section 1361 of the National Flood Insurance Act of 1968, as amended, communities participating in the NFIP are required to adopt and enforce floodplain management regulations that meet or exceed NFIP criteria. These criteria, including adoption of the FIS report and FIRM, and the modifications made by this LOMR, are the minimum requirements for continued NFIP participation and do not supersede more stringent State/Commonwealth or local requirements to which the regulations apply. We provide the floodway designation to your community as a tool to regulate floodplain development. Therefore, the floodway revision we have described in this letter, while acceptable to us, must also be acceptable to your community and adopted by appropriate community action, as specified in Paragraph 60.3(d) of the NFIP regulations. COMMUNITY REMINDERS We based this determination on the 1 -percent -annual -chance flood discharges computed in the FIS for your community without considering subsequent changes in watershed characteristics that could increase flood discharges. Future development of projects upstream could cause increased flood discharges, which could cause increased flood hazards. A comprehensive restudy of your community's flood hazards would consider the cumulative effects of development on flood discharges subsequent to the publication of the FIS report for your community and could, therefore, establish greater flood hazards in this area. Your community must regulate all proposed floodplain development and ensure that permits required by Federal and/or State/Commonwealth law have been obtained. State/Commonwealth or community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for construction or may limit development in floodplain areas. If your State/Commonwealth or community has adopted more restrictive or comprehensive floodplain management criteria, those criteria take precedence over the minimum NFIP requirements. We will not print and distribute this LOMR to primary users, such as local insurance agents or mortgage lenders; instead, the community will serve as a repository for the new data. We encourage you to disseminate the information in this LOMR by preparing a news release for publication in your community's newspaper that describes the revision and explains how your community will provide the data and help interpret the NFIP maps. In that way, interested persons, such as property owners, insurance agents, and mortgage lenders, can benefit from the information. This revision has met our criteria for removing an area from the 1 -percent -annual -chance floodplain to reflect the placement of fill. However, we encourage you to require that the lowest adjacent grade and lowest floor (including basement) of any structure placed within the subject area be elevated to or above the Base (1 -percent -annual -chance) Flood Elevation. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on our website at httos://www.fema.qov/flood-insurance. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0435P 102 -I -A -C Page 4 of 5 I Issue Date • MMarch 8, 2023 Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP Federal Emergency Management Agency ° Washington, D.C. 20472 AND StiGJ LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO, please contact: Jeanine D. Petterson Director, Mitigation Division Federal Emergency Management Agency, Region VIII Denver Federal Center, Building 710 P.O. Box 25267 Denver, CO 80225-0267 (303) 235-4830 STATUS OF THE COMMUNITY NFIP MAPS We will not physically revise and republish the FIRM and. FIS report for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panels and FIS report warrant physical revision and republication in the future, we will incorporate the modifications made by this LOMR at that time. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on our website at httqs://mvw.fema.gov/flood-insurance. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0435P 102 -I -A -C Page 5 of 5 I Issue Date; March 8, 2023 I Effective Date: July 28, 2023 I Case No.: 22-08-0435P I LOMR-APP ,VA�,,,,t, ° Federal Emergency Management Agency Washington, D.C. 20472 '1NDSFC LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) PUBLIC NOTIFICATION OF REVISION A notice of changes will be published in the Federal Register. This information also will be published in your local newspaper on or about the dates listed below, and through FEMA's Flood Hazard Mapping website at https://www.floodmaps.fema.gov/fhm/bfe_statusibfe_main.asp LOCAL NEWSPAPER Name: The Johnstown Breeze Date: March 23, 2023 and March 30, 2023 Within 90 days of the second publication in the local newspaper, any interested party may request that we reconsider this determination. Any request for reconsideration must be based on scientific or technical data. Therefore, this letter will be effective only after the 90 -day appeal period has elapsed and we have resolved any appeals that we receive during this appeal period. Until this LOMR is effective, the revised flood hazard determination presented in this LOMR may be changed. This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on our website at https://www. femamov/flood-insurance. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0435P 102 -I -A -C Revi Data LOCATION FLOODWAY 1% ANNUAL CHANCE FLOOD WATER SURFACE ELEVATION (FEET NAVD88) CROSS SECTION DISTANCE' WIDTH (FEET) SECTION AREA (SQ. FEET) MEAN VELOCITY (FEET/SEC) REGULATORY WITHOUT FLOODWAY WITH FLOODWAY INCREASE A -G2 H 21,852 951 4,149 3.7 4,784.1 4,784.1 4,784.5 0.4 ed I J K -Q2 R S T U V W-AC2 AD AE AF AG AH Al AJ AK AL AM AN AO AP AQ 26,963 29,675 51,063 54,671 57,640 59,071 63,612 90,209 92,820 95,543 96,686 99,153 100,905 103,789 106,196 109,018 111,360 114,974 116,678 117,564 120,191 1,380 1,124 331 / 1413 360 166 1,152 1,450 580 / 1943 744 1,741 362 917 818 545 371 393 585 1,110 594 492 425 5,105 4,812 2,412 2,146 1,446 2,234 4,136 3,386 3,364 3,271 2,069 2,621 4,976 4,119 1,700 2,357 4,545 4,527 3,131 2,270 2,278 3.1 3.3 6.5 7.3 10.9 7.2 3.9 4.8 4.6 4.7 7.4 5.9 3.1 3.4 8.2 5.9 3.1 3.1 4.5 6.2 6.2 4,793.9 4,796.6 4,840.8 4,848.4 4,854.2 4,863.2 4,872.7 4,931.3 4,939.0 4,944.0 4,948.3 4,956.2 4,962.9 4,972.3 4,976.1 4,989.2 5,000.9 5,011.6 5,019.8 5,024.0 5,037.1 4,793.9 4,796.6 4,840.8 4,848.4 4,854.2 4,863.2 4,872.7 4,931.3 4,939.0 4,944.0 4,948.3 4,956.2 4,962.9 4,972.3 4,976.1 4,989.2 5,000.9 5,011.6 5,019.8 5,024.0 5,037.1 4,794.2 4,797.1 4,841.1 4,848.9 4,854.6 4,863.2 4,872.9 4,931.3 4,939.5 4,944.0 4,948.5 4,956.2 4,962.9 4,972.7 4,976.4 4,989.7 5,001.4 5,011.7 5,020.2 5,024.5 5,037.5 0.3 0.5 0.3 0.5 0.4 0.0 0.2 0.0 0.5 0.0 0.2 0.0 0.0 0.4 0.3 0.5 0.5 0.1 0.4 0.5 0.4 Feet above confluence with Big Thompson River uLocated in Weld County FIS 3TotaI floodway width and width within Larimer County D W M Li FEDERAL EMERGENCY MANAGEMENT AGENCY LARIMER COUNTY, CO AND INCORPORATED AREAS REVISE TO FLOODWAY DATA REFLECT LOMB EFFECTIVE: July 28, 2023 FLOODING SOURCE: LITTLE THOMPSON RIVER Federal Emergency Management Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED Mr. Matt LeCerf Town Manager, Town of Johnstown 450 South Parish Avenue Johnstown, CO 80534 Dear Mr. LeCerf: Washington, D.C. 20472 March 23, 2020 IN REPLY REFER TO: Case No.: 19-08-0699R RECEIVED MAR 2 7 2020 WELD COUNTY COMMISSIONERS Community Name: Town of Johnstown, CO Community No.: 080250 104 We are providing our comments with the enclosed Conditional Letter of Map Revision (CLOMR) on a proposed project within your community that, if constructed as proposed, could revise the effective Flood Insurance Rate Map (FIRM) for your community. If you have any questions regarding the floodplain management regulations for your community, the National Flood Insurance Program (NFIP) in general, or technical questions regarding this CLOMR, please contact the Director, Mitigation Division of the Federal Emergency Management Agency (FEMA) Regional Office in Denver, at (303) 235-4830, or the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at https://www.fenla.gov/national-flood-insurance-profram. Sincerely, 4;"ZX--,-4/4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration Enclosure: Conditional Letter of Map Revision Comment Document cc: The Honorable Mike Freeman Chairman, Weld County Board of Commissioners Ms. Kim Meyer, AICP Director of Planning and Development Town of Johnstown Mr. Tom Parko Director of Planning Weld County GoMMvn:Go.i-,onS y /2 /2.o Mr. Mike Pietschmann, P.E. Principal Redland Consulting Group, Inc. Mr. Craig Campbell TF Johnstown Farms, L.P. cc:oEK(RR),cR03c/►f„), PwCSM), PL(TP) y/i6/2.o 2020-1146 Page 1 of 6 Issue Date: March 23, 2020 Case No.: 19-08-0699R CLOMR-APP Federal Emergency Management Agency ©�� Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Town of Johnstown Larimer County Colorado EXCAVATION FILL HYDRAULIC ANALYSIS UPDATED TOPOGRAPHIC DATA HYDROLOGIC ANALYSIS COMMUNITY NO.: 080250 IDENTIFIER Johnstown Farms APPROXIMATE LATITUDE & LONGITUDE: 40.323, -104.903 SOURCE: USGS QUADRANGLE DATUM: NAD 83 AFFECTED MAP PANELS ' TYPE: FIRM* NO.: 08069C1410F DATE: December 19, 2006 * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REACH DESCRIPTION Little Thompson River - From approximately 170 feet downstream of Weld County Road 46 1/2 to approximately 1,500 feet downstream of Weld County Road 17 PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Little Thompson River Fill Placement From Weld County Road 46 1/2 to approximatley 2,700 feet upstream of Weld County Road 46 1/2 Grading From Weld County Road 46 1/2 to approximatley 2,700 feet upstream of Weld County Road 46 1/2 SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Little Thompson River Zone A Zone A Yes Yes COMMENT This document provides the Federal Emergency Management Agency's (FEMA's) comment regarding a request for a CLOMR for the project described above. This document is not a final determination; it only provides our comment on the proposed project in relation to the flood hazard information shown on the effective National Flood Insurance Program (NFIP) map. We reviewed the submitted data and the data used to prepare the effective flood hazard information for your community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. Your community is responsible for approving all floodplain development and for ensuring that all permits required by Federal or State/Commonwealth law have been received. State/Commonwealth, county, and community officials, based on their knowledge of local conditions and in the interest of safety, may set higher standards for construction in the Special Flood Hazard Area (SFHA), the area subject to inundation by the base flood). If the State/Commonwealth, county, or community has adopted more restrictive or comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP criteria. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. .../41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 2 of 6 Ilssue Date: March 23, 2020 (Case No.: 19-08-0699R I CLOMR-APP ;@ARTS Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST CID Number: 080266 Name: Weld County, Colorado AFFECTED MAP PANELS TYPE: FIRM NO.: 08123C1684E DATE: January 20, 2016 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov///national-flood-insurance-program. ------"P4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 3 of 6 'Issue Date: March 23, 2020 'Case No.: 19-08-0699R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 h,:: �A ND .rz CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION To determine the changes in flood hazards that will be caused by the proposed project, we compared the hydraulic modeling reflecting the proposed project (referred to as the proposed conditions model) to the hydraulic modeling reflecting the existing conditions. The table below shows the changes in the base flood water -surface elevations (WSELs). Base Flood WSEL Comparison Table Flooding Source: Little Thompson River Base Flood WSEL Change (feet) Location of maximum change Proposed vs. Existing Maximum increase 0.6 approximately 2,610 feet upstream of Weld County Road 46 1/2 Maximum decrease 0.3 at the upstream side of Weld County Road 46 1/2 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. ----":411 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 4 of 6 tissue Date: March 23, 2020 (Case No.: 19-08-0699R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 D5 C CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR Upon completion of the project, your community must submit the data listed below and request that we make a final determination on revising the effective FIRM. If the project is built as proposed and the data below are received, a revision to the FIRM would be warranted. • Detailed application and certification forms must be used for requesting final revisions to the maps. Therefore, when the map revision request for the area covered by this letter is submitted, Form 1, entitled "Overview and Concurrence Form," must be included. A copy of this form may be accessed at https://www.fema.gov/media-library/assets/documents/1343. • The detailed application and certification forms listed below may be required if as -built conditions differ from the proposed plans. If required, please submit new forms, which may be accessed at https://www.fema.gov/media-library/assets/documents/1343, or annotated copies of the previously submitted forms showing the revised information. Form 2, entitled "Riverine Hydrology and Hydraulics Form." Hydraulic analyses for as -built conditions of the base flood must be submitted with Form 2. • A certified topographic work map showing the revised and effective base floodplain boundaries. Please ensure that the revised information ties in with the current effective information at the downstream and upstream ends of the revised reach. • An annotated copy of the FIRM, at the scale of the effective FIRM, that shows the revised base floodplain boundary delineations shown on the submitted work map and how they tie-in to the base floodplain boundary delineations shown on the current effective FIRM at the downstream and upstream ends of the revised reach. • As -built plans, certified by a registered Professional Engineer, of all proposed project elements. • Documentation of the individual legal notices sent to property owners who will be affected by any widening or shifting of the base floodplain along the Little Thompson River. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. .4i Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19.08-0699R 104 Page 5 of 6 Ilssue Date: March 23, 2020 'Case No.: 19-08-0699R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR (continued) • FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps may be accessed at https://www.fema.gov/forms-documents-and-software/flood-map-related-fees. The fee at the time of the map revision submittal must be received before we can begin processing the request. Payment of this fee can be made through a check or money order, made payable in U.S. funds to the National Flood Insurance Program, or by credit card (Visa or MasterCard only). Please either forward the payment, along with the revision application, to the following address: LOMC Clearinghouse Attention: LOMR Manager 3601 Eisenhower Avenue, Suite 500 Alexandria, Virginia 22304-6426 or submit the LOMR using the Online LOMC portal at: https://hazards.fema.gov/femaportal/onlinelomc/signin After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRM. Because the flood hazard information (i.e. SFHA) will change as a result of the project, a 90 -day appeal period will be initiated for the revision, during which community officials and interested persons may appeal the revised flood hazard information based on scientific or technical data. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. Patrick "Rick° F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 6 of 6 Ilssue Date: March 23, 2020 'Case No.: 19-08-0699R I CLOMR-APP Federal Emergency Management Agency s Washington, D.C. 20472 r nns� CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) COMMUNITY REMINDERS We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO, please contact: Ms. Jeanine P. Petterson Director, Mitigation Division Federal Emergency Management Agency, Region VIII Denver Federal Center, Building 710 P.O. Box 25267 Denver, CO 80225-0267 (303) 235-4830 A preliminary study is being conducted for Larimer County, Colorado. Preliminary copies of the revised FIRM and FIS report were submitted to your community for review on March 8, 2019, and may become effective before the revision request following this CLOMR is submitted. Please ensure that the data submitted for the revision ties into the data effective at the time of the submittal. Although a portion of the proposed area of revision is shown on the effective FIRM as located within Unincorporated Areas of Weld County, a portion of this area has been annexed by the Town of Johnstown. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304- 6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. 4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Federal Emergency Management Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Mike Freeman Chairman, Weld County Board of Commissioners P. O. Box 758 Greeley, CO 80632 Dear Mr. Freeman: Washington, D.C. 20472 March 23, 2020 IN REPLY REFER TO: Case No.: 19-08-0699R Community Name: Weld County, CO Community No.: 080266 104 RECEIVED MAR 2 7 2020 COMMISSIONERS We are providing our comments with the enclosed Conditional Letter of Map Revision (CLOMR) on a proposed project within your community that, if constructed as proposed, could revise the effective Flood Insurance Rate Map (FIRM) for your community. If you have any questions regarding the floodplain management regulations for your community, the National Flood Insurance Program (NFIP) in general, or technical questions regarding this CLOMR, please contact the Director, Mitigation Division of the Federal Emergency Management Agency (FEMA) Regional Office in Denver, at (303) 235-4830, or the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at littps://www.lema.gov/national-flood-insurance-program. Sincerely, Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration Enclosure: Conditional Letter of Map Revision Comment Document cc: Mr. Matt LeCerf Town Manager, Town of Johnstown Mr. Tom Parko Director of Planning Weld County Ms. Kim Meyer, AICP Director of Planning and Development Town of Johnstown Mr. Mike Pietschmann, P.E. Principal Redland Consulting Group, Inc. Mr. Craig Campbell TF Johnstown Farms, L.P. Page 1 of 6 Issue Date: March 23, 2020 'Case No.: 19-08-0699R I CLOMR-APP EVA RTC - j'9ND S; Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) EXCAVATION FILL HYDRAULIC ANALYSIS UPDATED TOPOGRAPHIC DATA HYDROLOGIC ANALYSIS COMMUNITY NO.: 080266 IDENTIFIER Johnstown Farms APPROXIMATE LATITUDE & LONGITUDE: 40.323, -104.903 SOURCE: USGS QUADRANGLE DATUM: NAD 83 AFFECTED MAP PANELS TYPE: FIRM* NO.: 08123C1684E DATE: January 20, 2016 ' FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REACH DESCRIPTION Little Thompson River - From approximately 170 feet downstream of Weld County Road 46 1/2 to approximately 1,500 feet downstream of Weld County Road 17 PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Little Thompson River Fill Placement From Weld County Road 46 1/2 to approximatley 2,700 feet upstream of Weld County Road 46 1/2 Grading From Weld County Road 46 1/2 to approximatley 2,700 feet upstream of Weld County Road 46 1/2 SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Little Thompson River Zone A Zone A Yes Yes COMMENT This document provides the Federal Emergency Management Agency's (FEMA's) comment regarding a request for a CLOMR for the project described above. This document is not a final determination; it only provides our comment on the proposed project in relation to the flood hazard information shown on the effective National Flood Insurance Program (NFIP) map. We reviewed the submitted data and the data used to prepare the effective flood hazard information for your community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. Your community is responsible for approving all floodplain development and for ensuring that all permits required by Federal or State/Commonwealth law have been received. State/Commonwealth, county, and community officials, based on their knowledge of local conditions and in the interest of safety, may set higher standards for construction in the Special Flood Hazard Area (SFHA), the area subject to inundation by the base flood). If the State/Commonwealth, county, or community has adopted more restrictive or comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP criteria. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. *4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 2 of 6 Ilssue Date: March 23, 2020 (Case No.: 19-08-0699R I CLOMR-APP OFPAr RT�-6" w �� Federal Emergency Management Agency fir '` Washington, D.C. 20472 1'1ND S CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST CID Number: 080250 Name: Town of Johnstown, Colorado AFFECTED MAP PANELS TYPE: FIRM NO.: 08069C1410F DATE: December 19, 2006 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. —41i Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 3 of 6 'Issue Date: March 23, 2020 (Case No.: 19-08-0699R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 ZNI> 51G CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION i To determine the changes in flood hazards that will be caused by the proposed project, we compared the hydraulic modeling reflecting the proposed project (referred to as the proposed conditions model) to the hydraulic modeling reflecting the existing conditions. The table below shows the changes in the base flood water -surface elevations (WSELs). Base Flood WSEL Comparison Table Flooding Source: Little Thompson River Base Flood WSEL Change (feet) Location of maximum change Proposed vs. Existing Maximum increase None N/A Maximum decrease 0.3 at the upstream side of Weld County Road 46 1/2 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.goJv//nnational-flood-insurance-program. ----.--,57:Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 4 of 6 'Issue Date: March 23, 2020 'Case No.: 19-08-0699R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR Upon completion of the project, your community must submit the data listed below and request that we make a final determination on revising the effective FIRM. If the project is built as proposed and the data below are received, a revision to the FIRM would be warranted. • Detailed application and certification forms must be used for requesting final revisions to the maps. Therefore, when the map revision request for the area covered by this letter is submitted, Form 1, entitled "Overview and Concurrence Form," must be included. A copy of this form may be accessed at https://www.fema.gov/media-library/assets/documents/1343. • The detailed application and certification forms listed below may be required if as -built conditions differ from the proposed plans. If required, please submit new forms, which may be accessed at https://www.fema.gov/media-library/assets/documents/1343, or annotated copies of the previously submitted forms showing the revised information. Form 2, entitled "Riverine Hydrology and Hydraulics Form." Hydraulic analyses for as -built conditions of the base flood must be submitted with Form 2. • A certified topographic work map showing the revised and effective base floodplain boundaries. Please ensure that the revised information ties in with the current effective information at the downstream and upstream ends of the revised reach. • An annotated copy of the FIRM, at the scale of the effective FIRM, that shows the revised base floodplain boundary delineations shown on the submitted work map and how they tie-in to the base floodplain boundary delineations shown on the current effective FIRM at the downstream and upstream ends of the revised reach. • As -built plans, certified by a registered Professional Engineer, of all proposed project elements. • Documentation of the individual legal notices sent to property owners who will be affected by any widening or shifting of the base floodplain along the Little Thompson River. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 5 of 6 Ilssue Date: March 23, 2020 'Case No.: 19-08-0699R I CLOMR-APP _ RT Federal Emergency Management Agency g Y g Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR (continued) • FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps may be accessed at https://www.fema.gov/forms-documents-and-software/flood-map-related-fees. The fee at the time of the map revision submittal must be received before we can begin processing the request. Payment of this fee can be made through a check or money order, made payable in U.S. funds to the National Flood Insurance Program, or by credit card (Visa or MasterCard only). Please either forward the payment, along with the revision application, to the following address: LOMC Clearinghouse Attention: LOMR Manager 3601 Eisenhower Avenue, Suite 500 Alexandria, Virginia 22304-6426 or submit the LOMR using the Online LOMC portal at: https://hazards.fema.gov/femaportal/onlinelomc/signin After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRM. Because the flood hazard information (i.e. SFHA) will change as a result of the project, a 90 -day appeal period will be initiated for the revision, during which community officials and interested persons may appeal the revised flood hazard information based on scientific or technical data. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. '41 Patrick 'Rick° F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Page 6 of 6 'Issue Date: March 23, 2020 'Case No.: 19-08-0699R 1 CLOMR-APP " }ppRT o Federal Emergency Management Agency 4� fit+ S>r,,,, ' / ` Washington, D.C. 20472 zht�ND 5�G CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) COMMUNITY REMINDERS We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO, please contact: Ms. Jeanine P. Petterson Director, Mitigation Division Federal Emergency Management Agency, Region VIII Denver Federal Center, Building 710 P.O. Box 25267 Denver, CO 80225-0267 (303) 235-4830 Although a portion of the proposed area of revision is shown on the effective FIRM as located within Unincorporated Areas of Weld County, a portion of this area has been annexed by the Town of Johnstown. We are preparing a revised FIRM and FIS report for Weld County in our countywide format; therefore, preliminary copies may become effective before the revision request following this CLOMR is submitted. Preliminary copies of the countywide FIRM and FIS report, which will present information from the effective FIRMs and FIS reports for your community, will be distributed for review in approximately 2 months. We will incorporate the modifications made by the LOMR which follows this CLOMR into the Preliminary countywide FIRM before it is distributed, and the modifications will be included when the countywide FIRM becomes effective. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304- 6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/national-flood-insurance-program. '41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 19-08-0699R 104 Hello