The URL can be used to link to this page

Browse Search

Home My WebLink About20232001.tiffFederal Emergency Management Agency Washington, D.C. 20472 RECEIVED November 14, 2023 Nov 2 0 2023 CERTIFIED MAIL RETURN RECEIPT REQUESTED Mike Freeman Chair, Weld County Board of Commissioners P. O. Box 758 Greeley, CO 80632 Dear Mike Freeman: IN REPLY REFER TO: WELD COUNTY Case No.: 22-08-0472P COMMISSIONERS Follows Conditional Case No.: 14-08-1088R Community Name: Weld County, CO Community No.: 080266 FIRM Panel Affected: 08123C 1542E, 08123C1543E, 08123C 1544E, 08123C1563E 116 In a Letter of Map Revision (LOMR) dated June 13, 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 South Platte River - from approximately 4,450 feet upstream of Weld County Parkway to approximately 2,370 feet upstream of U.S. Highway 34; South Platte River Breach - from the confluence with the South Platte River to approximately 4,230 feet upstream of U.S. Highway 34; South Platte River Spill - from the confluence with the South Platte River to approximately 690 feet upstream of U.S. Highway 34; and U.S. Highway 34 Levee Overflow Channel - from South Platte River Cross Section F to the divergence from the South Platte River. The 90 -day appeal period that was initiated on July 5, 2023, when the Department of Homeland Security's Federal Emergency Management Agency (FEMA) published a notice of proposed Flood Hazard Determinations in The Greeley 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 November 2, 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 Flood 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. COMMUn",Go.-}-;ons 12 /o I -I /23 cc OEM(RR),PL(TP/MN/DA), Pc4(cH /ER/DD) 11/30/23 2023 -20o I 2 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. 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, Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration cc: The Honorable Gary Lagrimanta Mayor, Town of Kersey The Honorable John Gates Mayor, City of Greeley Kevin Houck, PE, CFM Chief, Watershed and Flood Protection Section Colorado Water Conservation Board Marta Blanco Castano, GISP, CFM Floodplain Mapping Program Assistant Colorado Water Conservation Board Tom Parko Floodplain Administrator Weld County Tern Fead, PE, CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Jake Maybach, PE, CFM Senior Water Resources Engineer RS&H, Inc. Federal Emergency Management Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Mike Freeman Chair, Weld County Board of Commissioners P. 0. Box 758 Greeley, CO 80632 Dear Honorable Mike Freeman: Washington, D.C. 20472 June 13, 2023 IN REPLY REFER TO: Case No.: 22-08-0472P Follows Conditional Case No.: 14-08-1088R Community Name: Weld County, CO Community No.: 080266 Effective Date of This Revision: November 2, 2023 RECEIVED JUN 2 62023 WELD COUNTY COMMISSIONERS The Flood Insurance Study (FIS) report 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 that provide information regarding this LOMR. Please see the List of Enclosures below to determine which documents are included. Other enclosures 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 (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at littps://s:ww.fema.aot-flood-insurance. Sincerely, 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 cc: The Honorable Gary Lagrimanta Mayor, Town of Kersey The Honorable John Gates Mayor, City of Greeley Kevin Houck, PE, CFM Chief, Watershed and Flood Protection Section Colorado Water Conservation Board Co MIA') n Co.* ► o nS cc*. oEM(RR' PL(rPIHw/oa) O7/17/23 poi (cH/6R/oD) o7/.2/z3 Marta Blanco Castano, GISP, CFM Floodplain Mapping Program Assistant Colorado Water Conservation Board Tom Parko Floodplain Administrator Weld County Terri Fead, PE, CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Jake Maybach, PE, CFM Senior Water Resources Engineer RS&H, Inc. 2023-2001 Page 1 of 6 I Issue Date: June 13,1023 I Effective Date: November 2, 2023 I Case No.: 22-08-0472P I LOMR-APP Follows Conditional Case No.: 14-08-1088R Otiyj RT��, ° Federal Emergency Management Agency Washington, D.C. 20472 `1 ND StiG� LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) BRIDGE CULVERT FILL 1D HYDRAULIC ANALYSIS FLOODWAY UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 080266 IDENTIFIER US 34D LOMR APPROXIMATE LATITUDE & LONGITUDE: 40.397, -104.638 SOURCE: USGS QUADRANGLE DATUM: NAD 83 ANNOTATED MAPPING ENCLOSURES ANNOTATED STUDY ENCLOSURES TYPE: FIRM* NO.: 08123C1542E DATE: January 20, 2016 TYPE: FIRM* NO.: 08123C1543E DATE: January 20, 2016 TYPE: FIRM* NO.: 08123C1544E DATE: January 20, 2016 TYPE: FIRM* NO.: 08123C1563E DATE: January 20, 2016 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 20, 2016 PROFILES: 102P - 104P, 138P, AND 139P FLOODWAY DATA TABLE: 5 SUMMARY OF DISCHARGES TABLE: 2 Enclosures reflect changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map FLOODING SOURCES AND REVISED REACHES See Page Mr Additional Flooding Sources South Platte River - from approximately 4,450 feet upstream of Weld County Parkway to approximately 2,370 feet upstream of U.S. Highway 34 SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases South Platte 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 about this document, Clearinghouse, 3601 insurance. based on the flood data presently available. The enclosed documents provide additional information regarding this please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration determination. If you have any questions or by letter addressed to the L0MC our website at httos://www.fema.gov/flood- 22-08-0472P 102 -I -A -C Page 2 of 6 I Issue Date: June 13, 2023 I Effective Date: November 2, 2023 I Case No.: 22-08-0472P I LOMR-APP „OIL, ...,,144, ° Federal Emergency Management Agency Washington, D.C. 20472 t`1ND LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) OTHER FLOODING SOURCES AFFECTED BY THIS REVISION FLOODING SOURCES AND REVISED REACHES South Platte River Breach - from the confluence with the South Platte River to approximately 4,230 feet upstream of U.S. Highway 34 South Platte River Spill - from the confluence with the South Platte River to approximately 690 feet upstream of U.S. Highway 34 U.S. Highway 34 Levee Overflow Channel - from South Platte River Cross Section F to the divergence from the South Platte River SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases South Platte River Breach BFEs' BFEs YES YES No Floodway Floodway YES NONE Zone X (shaded) Zone X (shaded) YES YES Zone AE Zone AE YES YES South Platte River Spill BFEs BFEs YES YES No Floodway Floodway YES NONE Zone X (shaded) Zone X (shaded) YES YES Zone AE Zone AE YES YES U.S. Highway 34 Levee Overflow Channel Zone AE Removed NONE YES BFEs - Base (1 -percent -annual -chance) Flood Elevations 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 (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 our website at httos://www.fema.00v/flood- insurance. Patrick 'Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0472P 102 -I -A -C Page 3 of 6 Issue Date: June 13, 2023 I Effective Date: November 2, 2023 I Case No.: 22-08-0472P I LOMR-APP , °� Federal Emergency Management Agency Washington, D.C. 20472 lyND StiG LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS REVISION CID Number: 080184 Name: City of Greeley, Colorado AFFECTED MAP PANELS AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT TYPE: FIRM* NO.: 08123C1542E DATE January 20, 2016 TYPE: FIRM* NO.: 08123C1543E DATE January 20, 2016 TYPE: FIRM* NO.: 08123C1544E DATE: January 20, 2016 TYPE: FIRM* NO.: 08123C1563E DATE: January 20, 2016 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 20, 2016 PROFILES: 102P - 104P, 138P, AND 139P FLOODWAY DATA TABLE: 5 SUMMARY OF DISCHARGES TABLE: 2 CID Number: 080185 Name: Town of Kersey, Colorado AFFECTED MAP PANELS AFFECTED PORTIONS OF THE FLOOD INSURANCE STUDY REPORT TYPE FIRM* NO.: 08123C1542E DATE: January 20, 2016 TYPE: FIRM* NO.: 08123C1543E DATE: January 20, 2016 TYPE: FIRM* NO.: 08123C1544E DATE January 20, 2016 TYPE: FIRM* NO.: 08123C1563E DATE: January 20, 2016 DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 20, 2016 PROFILES: 102P - 104P, 138P, AND 139P FLOODWAY DATA TABLE: 5 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 (FMIX) Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional insurance. provide additional information regarding this determination. If you have any questions toll 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 https://www.fema.aov/flood- P.E., Branch Chief Branch and Mitigation Administration 22-08-0472P 102 -I -A -C Patrick "Rick" F. Sacbibit, Engineering Services Federal Insurance Page 4 of 6 Issue Date: June 13, 2023 I Effective Date: November 2,2023 I Case No.: 22-08-0472P I LOMR-APP ii..........frART4,4,...„9,, Federal Emergency Management Agency Washington, D.C. 20472 t�ND Stir 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. NFIP regulations Subparagraph 60.3(b)(7) requires communities to ensure that the flood -carrying capacity within the altered or relocated portion of any watercourse is maintained. This provision is incorporated into your community's existing floodplain management ordinances; therefore, responsibility for maintenance of the altered or relocated watercourse, including any related appurtenances such as bridges, culverts, and other drainage structures, rests with your community. We may request that your community submit a description and schedule of maintenance activities necessary to ensure this requirement. COMMUNITY REMINDERS We based this determination on the 1 -percent -annual -chance flood discharges computed in the preliminary 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. 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 (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 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 22-08-0472P 102 -I -A -C Page 5 of 6 Issue Date: June 13, 2023 I Effective Date: November 2, 2023 I Case No.: 22-08-0472P I LOMR-APP OtiYA��,t,` A Federal Emergency Management Agency Washington, D.C. 20472 D SAGO LETTER OF MAP REVISION DETERMINATION DOCUMENT (CONTINUED) 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 base (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. 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 or reissue the LOMR on the new FIRM and FIS report. Although the project area is shown on the above -referenced FIRM panel as within Unincorporated Areas of Weld County, the Town of Kersey has annexed portions of this area. We have not reflected these corporate limits changes in this LOMR. 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 (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 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 22-08-0472P 102 -I -A -C Page 6 of 6 I Issue Date: June 13, 2023 I Effective Date: November 2, 2023 I Case No.: 22-08-0472P I LOMR-APP Federal Emergency Management Agency 4 Washington, D.C. 20472 Nn 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_status/bfe_main.asp LOCAL NEWSPAPER Name: Greeley Tribune Dates: June 28, 2023 and July 5, 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 (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 our website at https://www.fema.gov/flood- insurance. 4C;:._.-0.... C�^"/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 22-08-0472P 102 -I -A -C 4 Table 2 - Summary of Discharges (Continued) Flooding Source and Location Sheep Draw 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 Sheep Draw (Continued) At upstream side of 1 Oth Street Tributary Inflow (Downstream of 71St Avenue) Tributary Inflow (River Station 17237) Tributary Inflow (Upstream of 77th Avenue) Tributary Inflow (River Station 20280) Downstream of 83rd Avenue Tributary Inflow (River Station 23334) Downstream of Mountain Shadows Detention Pond Downstream of Pebble Brook Detention Pond Left Bank Tributary Inflow Downstream of 95th Avenue Upstream of 95th Avenue Upstream of U.S. Highway 34 Bypass At Confluence with Irrigation Reservoir No 2 Outflow from Irrigation Reservoir No. 1 Inflow to Irrigation Reservoir No. 1 Upstream Limit of Study South Platte River Downstream of Box Elder Creek At 37th Avenue At U.S. Highway 85 (Near Evans) At Fort Lupton Peak Discharges (cfs) Drainage Area 10 -Percent 2 -Percent 1 -Percent 0.2 -Percent (Square Miles) Annual Chance Annual Chance Annual Chance Annual Chance REVISED DATA 1 1 1 1 1 1 1 7,500 7,500 5,010 1,221 1,200 1,176 1,163 1,134 1,104 1,085 993 814 808 740 737 730 695 661 657 627 590 570 484 390 434 243 --1 11,000 11,000 10,000 3,212 3,156 3,117 3,102 3,055 3,002 2,977 2,789 2,432 2,407 2,227 2,215 2,198 2,067 1,986 1,979 1,893 1,691 1,633 1,467 1,174 1,223 675 1 24,000 24,500 22,000 4,673 4,596 4,556 4,558 4,502 4,436 4,425 4,216 3,756 3,743 3,506 3,494 3,491 3,304 3,185 3,176 3,055 2,585 2,498 2,028 1,597 1,638 872 44,000 32,500 32,500 29,000 8,065 7,940 7,897 7,939 7,862 7,766 7,787 7,529 6,830 6,845 6,476 6,464 6,493 6,176 5,969 5,955 5,753 4,661 4,506 3,331 2,579 2,602 1,329 __1 57,000 57,500 52,000 South Platte River Breach 3,951 At Confluence with South Platte River South Platte River Spill __ 288 At Confluence with South Platte River 11,962 576 15,286 22,709 765 1,188 'Data Not Available REVISED TO REFLECT LOMR EFFECTIVE: November 2, 2023 r Table 2 - Summary of Discharges (Continued) Flooding Source and Location Spring Creek Approximately 1,800 feet upstream of intersection of Rowe Avenue and U.S. Highway 85 At Rowe Avenue Spring Creek Overflow At Weld County Road 88 At Park Avenue At Rowe Avenue Spring Creek Tributary At Weld County Road 88 The Slough Peak Discharges (cfs) Drainage Area 10 -Percent 2 -Percent 1 -Percent 0.2 -Percent (Square Miles) Annual Chance Annual Chance Annual Chance Annual Chance 95 96.5 95.7 95.0 1 1 The Slough — Below John Law Ditch Reservoir 37.47 Tri-Area Drainage At County Road 13 At McClure Avenue At 1 S1 Street At Miner's Park Pond Overflow At Confluence of Tri-Area East Tributary At South Platte River Cross Section F 'Data Not Available REVISED DATA 3.8 3.1 2.7 2.5 1.2 2,080 1,554 299 540 540 2,280 275 1 474 416 318 292 250 4,450 1,728 369 2,134 2,730 4,180 1,350 1 907 674 358 302 693 5.640 1,885 369 2,446 3,775 5,780 2,150 4,443 1,035 767 365 304 896 8,200 2,345 373 3,050 5,870 8,320 4,800 1 1,505 1,106 380 308 1,269 REVISED TO REFLECT LOMR EFFECTIVE: November 2, 2023 FLOODING SOURCE FLOODWAY 1 -PERCENT WATER -ANNUAL SURFACE -CHANCE ELEVATION FLOOD CROSS SECTION DISTANCE' WIDTH (FEET) SECTION (SQUARE AREA FEET) (FEET VELOCITY SECOND) MEAN PER REGULATORY (FEET NAVD) FLOODWAY WITHOUT (FEET FLOODWAY WITH NAVD)(FEET) INCREASE ( FEET NAVD) 1,310,630 4,154 18,738 1.9 4,605.4 4,605.4 4,606.2 0.8 SOUTH PLATTE A RIVER 1 4 REVISED LOMR JUNE DATED 21, BY 2017E C D F 1,314,350 1,315.375 1,315,670 1,316,815 1,372 2,321 679 811 7,724 6,872 8,641 11,897 O co h I- co 'la r- co O co c- i- N - in It N c7 c7 N N CON CO r r 4,611.2 4,612.5 4,613.2 4,614.2 4,611.2 4,612.5 4,613.2 4.614.2 4,611.2 4.612.6 4,613.3 4,614.3 0.0 0.1 0.1 Q.1 G H I J K L M N O 1,321,026 1,323,525 1,323,809 1,325,165 1,327,201 1,327,621 1,328,700 1,330,135 11331,036 3,500 4,000 3.125 2,912 1,725 1,746 1,178 2,655 2,419 11,269 10,751 10,136 11,799 12,406 9,394 6,819 7,478 6,083 4,618.0 4.621.9 4,622.3 4.623.3 4,626.4 4,626.8 4,628.3 4,631.1 4,631.2 4,618.0 4,621.9 4,622.3 4,623.3 4,626.4 4,626.8 4,628.3 4,631.1 4.63t2 4,618.4 4,622.4 4.622.8 4,623.7 4,626.7 4,627.2 4,628.6 4,631.4 4,631.6 0.4 0.5 0.5 0.4 0.3 0.4 0.3 0.3 0.4 P 1,333,140 2,584 17,421 , 4,632.7 REVISED DATA t Q R S T U V 1,334,770 1,337,280 1,339,430 1,339,530 1,340,730 1,344,710 1,585 2,227 1,194 1,538 535 629 10,489 10,944 5,457 4,110 4,511 4,518 _ CO -J -J -.NJ CO CD 7 O o m co --L 0 Ci 4,634.6 4,639.0 4,641.3 4,641.7 4,644.4 4,649.2 4,632. 4,634.6 4,639.0 4,641.3 4,641.7 4,644.4 4,649.2 / 4,633.4 4,635.5 4,639.8 4,642.3 4,642.3 4,645.1 4,649.5 0.7 0.9 0.8 1.0 0.6 0.7 0.3 'Feet above Mouth r m FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS REVISED TO FLOODWAY DATA REFLECT MR EFFECTIVE:November2, Zoe, SOUTH PLATTE RIVER FLOODING SOURCE FLOODWAY 1 -PERCENT WATER -ANNUAL SURFACE -CHANCE ELEVATION FLOOD CROSS SECTION DISTANCE WIDTH (FEET) FEET SECTION (SQUARE AREA FEET) (FEET VELOCITY SECOND) MEAN PER REGULATORY (FEET NAVD) (FEET FLOODWAY WITHOUT NAVD) (FEET FLOODWAY WITH NAVD) INCREASE SOUTH RIVER BREACH A B C D PLATTE 470 949 3,158 5,814 1,153 1,714 2,240 925 2,859 4,929 6,643 9,900 5.4 3.1 2.3 1.6 4,624.0 4,625.5 4,630.5 4,631.0 4,624.0 4,625.5 4,630.5 4,631.0 4,624.2 4,625.6 4,630.5 4,631.1 0.2 0.1 0.0 0.1 'Feet above confluence with South Platte River ca r m FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS REVISED TO FLOODWAY DATA REFLECT LOMR EFFECTIVE: November 2, 2023 SOUTH PLATTE RIVER BREACH C FLOODING SOURCE FLOODWAY 1 -PERCENT WATER -ANNUAL SURFACE -CHANCE ELEVATION FLOOD ROSS SECTION DISTANCE' WIDTH (FEET) FEET SECTION (SQUARE(FEET ( AREA Q FEET) VELOCITY SECOND) MEAN PER REGULATORY (FEET NAVD) (FEET FLOODWAY WITHOUT NAVD) (FEET FLOODWAY WITH NAVD) INCREASE (FEET) JOUTH RIVER A B PLATTE SPILL 1,124 200 1,702 755 2,296 10,871 0.3 0.1 4,625.9 4,630.6 4,625.9 4,630.6 4,626.2 4,630.6 0.3 0.0 1Feet above confluence with South Platte River FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS FLOODWAY DATA REVISED TO REFLECT LOMR EFFECTIVE: November 2, 2023 SOUTH PLATTE RIVER SPILL 4.640 4,640 I J U a W REVISED TO REFLECT LON EFFECTIVE: N _ x r u) 4,635 4,635 - L1.1 ;i\ U U Z W W LL LL J Q 0 " 0 4.630 4,630 1 U I U H W � ° F- F-- - - J 4,625 4.625 _ _ TL 1 _ r r '�. - - _ F-�� r - - D i 1 i - i - i O r i �� _ r - - r rte.�• r vJ J E _ tC/ r r _ - - z 4.620 4,620 1-- } w in I z z = O Q4.615 r 4,615 > �� w I W 4.610 4,610 v // Wi w 0 Q OQ �_ w W >M.� 4.605 4,605 Q H o LEGEND Z Q Q 2 D cc 0 ° ... ••. SO z c) eL O 4.600 2°/0 ANNUAL CHANCE FLOOD w J Z 10`)/0 ANNUAL CHANCE FLOOD 1.L1 IS I I J �� A - CROSS BED . • w ❑ a Q II w CD LL 4.595 1,320,500 1,321,000 1,321,500 1,322,000 1,322,500 1,323,000 STREAM 1,323,500 DISTANCE IN 1,324,000 FEET ABOVE MOUTH 1,324,500 1,325,000 1,325,500 1,326,000 1,326,500 1,327,000 103P 4.650 4,650 REVISED TO REFLECT LOMR EFFECTIVE: November 2, 2023 REVISED �-- REACH 4.645 4,645 - NOTE: REVISED FLOOD AREA ELEVATIONS ARE BASED WITHIN UPON THE W UPDATED PRELIMINARY STUDY 4,640 4,640 o CC 4,635 4,635 0 PI O 0 _ - - > __'�' ? 4.630 --`� 4,630 ... - �,�. w - - � �- - LL _-� - r r r .r. z --- r r �, - Z _ r r r �� r r r ......... Q - �t 4,625 4.625 > re-- �, >- QOD w (I) a = Z _} m - 4,620 ►--- -- 4,620 w o I- O Q LI w U cc 2 - Q O o 4.615 4,615 LEGEND I- Q Z >- O 0 O Q. 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD r 1 Q. iii a O 4.610 2% ANNUAL CHANCE FLOOD - -- 10% ANNUAL CHANCE FLOOD W J Z 2 W K L M N p A STREAM CROSS BED SECTION LOCATION LII O - < Q W 0 w I.L. 4,605 1,327,000 1,327,500 1,328,000 1,328,500 1,329,000 1,329,500 1,330,000 1,330,500 1,331,000 1,331,500 1,332,000 1,332,500 - 1,333,000 1,333,500 STREAM DISTANCE IN FEET ABOVE MOUTH 104P 4,630 4,630 - REVISED REACH en - NOTE: FLOOD ELEVATIONS WITHIN REVISED ARE BASED UPON THE AREA UPDATED PRELIMINARY STUDY REACH REVISED BY LOMR DATED JUNE 21, 2017 - 1 4,625 4.625 iE[ EC 4,620 -- 4.620 - �- r � — .. r `� fir - ... d SM.— ! - Q ^ LL _ --- -- _ r - �- 4,615 4,615 ,., __.-- _ _ _ _ _ O = - _- _ O -- _ __ -� _✓ _ __ (1) - - - - o �- - _- > - _ __ .- --� 4,610 ? 4,610 ________- ,�� _----- -- -- w w-- ,L ....----- Z z O Q 4,605 4.605 > w I w Q v 4.600 4,600 ccz Q a. w c F- O Q >- U in D w ci o 4,595 Q w >- Q 4.595 0 Z w LEGEND z I-- O O O 0.2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0_ W Q O 2% ANNUAL CHANCE FLOOD IY 4.590 - - w Z 10% ANNUAL CHANCE FLOOD 2 C D E F A STREAM BED CROSS SECTION LOCATION 11-1 o Z Q Q W 0 w U- 4.585 1,314,000 - 1,314,500 1,315,000 1,315,500 1,316,000 1,316,500 STREAM 1,317,000 DISTANCE IN FEET 1,317,500 ABOVE MOUTH 1,318,000 1,318,500 1,319,000 1,319,500 1,320,000 1,320,500 102P 4,655 MR November 2, 2023 4,655 ri III E w -J J H Q C1) 4,650 4,650 o W I >- w>H I VMI O zW o w Cl) w it `� Q = r= >r E; CO ©i - 1 4,645 4,645 n D W z w 0 CD D J LL a. 0 4,640 QO 4.640 0 0 L/1 O C!) 4,635 ? 4.635 w w ION INI - ,- ` - 4,630 _- _ - rt Z r i I I I r �' 4,625 4.625 - r - w ) I- 0 Q - - �� - - 4,620 LU 2 w Q Q 4.620 LEGEND H0 I- zz Z 2 D Cr U O a_ 0.2°AANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD z O it 0 O o 2% ANNUAL CHANCE FLOOD CC 4.615 - w J Z - 10% ANNUAL CHANCE FLOOD 2 A B C A STREAM CROSS BED SECTION LOCATION w 0 Z Q Q CC W 0 w LL - - - 4.610 0 500 1,000 1,500 2,000 STREAM DISTANCE 2,500 IN FEET 3,000 ABOVE CONFLUENCE 3,500 WITH SOUTH 4,000 PLATTE RIVER 4,500 5,000 5,500 6,000 6,500 138P 4,655 ISED TO .ECT LOMR ECTIVE: November 2, 2023 4,655 rx w > E I w U Q F a O w 4,650 4,650 co L t ¢ Lu H LU J O I zcy CL I= w� U) I-- 0 Q w D w 4,645 LU 4,645 a U p r z H W D 0 D 0 J E 1.1- f/) Z O U 1 1 4,640 0 o 4.640 E - a - O I _ F- D O U) 4,635 ? 4,635 F LU w IL z z 0 _ _ _ 4,630 4,630 w J y L1.1 I NCY 4,625 4,625 -' II _ < w >- Q 4,620 4,620 r,�cD LEGEND 0.2% ANNUAL CHANCE FLOOD �. o Z Q Q 2 D cc U O DC 1 % ANNUAL CHANCE FLOOD a, U DC w CD CI O U 2% ANNUAL CHANCE FLOOD 4,615 - - ' z -- - •- _ - - 0% ANNUAL CHANCE FLOOD G W 0 w A B o A STREAM BED CROSS SECTION LOCATION Q Q IY al o w LL - 4,610 0 200 400 - 600 800 STREAM DISTANCE 1,000 IN FEET 1,200 ABOVE CONFLUENCE 1,400 WITH SOUTH 1,600 PLATTE RIVER 1,800 2,000 2,200 2,400 2,600 139P ZONE AE Wativ E 16TH ST 18TH STY Areas NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 5 NORTH, RANGE 65 WEST. SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD SCALE Without Base Flood Elevation (B FE) With BFE or Depth :>:,e.AE, AO. AM. vr:. N? 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. Map Projection: NAD83 UTM Zone 13N Western Hemisphere: Vertical Datum: NAVD88 1 inch - 500 feet 1:6.000 1.000 Feet Meters 300 NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE N' WELD COUNTY, COLORADO And Incorporated Areas PANEL 1542 OF 2250 Panel Contains: COMMUNITY GREELEY. CITY OF WELD COUNTY NUMBER 080184 080266 PANEL SUFFIX REVISED TO REFLECT LOMR EFFECTIVE: November 2, 2023 VERSION NUMBER 1.1.1.0 MAP NUMBER 08123C1542E EFFECTIVE DATE JANUARY 20. 2016 ... T: - .. N o TE° M • ID A �� SH o WN ON TM@ C NEL LOCATE D Without Zone With ease Flood E!avation (BFE) A.V. 49c.:.• BFE or Depth Zone AE. AO, Ali, VE, AR VY{THI°N ToWN'SHI No TH,a ANGE o5la a W SPECIAL FLOOD Regulatory Floodway . I Coulnl Q HAZARD AREAS 0.2`)/0 Annual Chance Flood Hazard, Areas of 1% annual chance flood H ith average .Uicrr't I i I I o i I • / '' • r -s LL Er W 2 depth less than one foot ith drainage ° i i or H areas of less than one square mile o �l �,�1 Future Conditions 1% Annual_ , ,�. a= W 1 I Couln►ty \1-' 3 Chance Flood Hazard ,,„ OTHER AREAS OF FLOOD HAZARD + Area with "'` See Notes. Reduced Flood RISK due to Levee '` �l�c�ro �r•�t . r .s j 3•dr , ��H ' SCALE _ =____::::,,H,....----,-::�-• j4rHsrui.T_" . --:�.. _ - . As- Map Projectionii NAD83 UTM Zone 13N Western Hemisphere. Vertical Datum NAVD88 > 24TH ST.RD _ ° �; { '; •-•- ` N finch =500 feet 1:6000 ' I•_ - ® . IS NI t' 1 { 0 250 500 ' " - 1.000 � t x Feet s• - iiirti '4 ` le• : ..., Meters 24TH ST LN ~ = ZONE A' E o 0 0 75 150 330 t ' i ,�.� • W .y. 4.NATIONAL FLOOD INSURANCE PROGRAM ,,,, • Y -: ON -2 1' ' , r`' - O'CO �'T' NSW- ` NCE RATE r°-, . ,. u. �- 1 ' , -s�. . �+ i'. 174.11 �' - 25TH ST _.. W WELD COUNTY, COLORADO iha I> ,�:lit s O And Incorporated Areas E��,ar - M V eiieL I. 1543 2250 _ w PANEL of 2 __ • * 11 Nli4. 25TH RD 4 h- - tlND ST :w stc _ .. 0--) 2 1� y •{ .iti ' ta Panel Contains: • City LOr in COMMUNITY NUMBER PANEL SUFFIXIt, ieeley It ..;. EVANS, CITY OF 080182 1543 E 080184 ;r 10 GARDEN CITY, TOWN OF 080246 1543 E O GREELEY. CITY OF 080184 1543 E 25TH ST LN _ o WELD COUNTY 080266 1543 E� „ 4 �� , `I► .` y Lia- F •a` -- w REVISED TO ` � o '° �: - - 46219 • REFLECT LOMB C13 EFFECTIVE: November 2, 2023 �. z r O NC , E - r iltIC!Ct 1 r - Li a`',�� ,^ VERSION NUMBER it11:� .`' - 1.1.1.0' 4', ~ 4629-3 . MAP NUMBER 0812301543E ( 34 -'}_ ,rt _ _ an 1 r EFFECTIVE DATE ii,-, '+ JANUARY 20. 2016 4630.5` Z E A5 - -= Weld County 4631.1 • k . 4631 ___ Unincorporated Areas `'.. 080266 �� 1 • 0.31 ti 'ions_ /° •i. 4e �' • -�j nit - Patterson s©n �il�J O _ ' 1 - J _ - D Nth _ It _' ao C _°- ;P `"r--- 44631:3 � , � if _ • 7 yr ♦ ' . e- • L -• ,- J• -'R _ 4 yr, .,Greeley . F ; _..: - Alit I iii Alta - tamale II R _l 0 t Jr* a - ‘1,... / V �, = Profile ZONEAE 4e), .. �+ seine , (e} `w . ._, SSHOWN • 4)7 s't. ft. Profile Baseline Weld ;@county Unincorporated 080266 ®N THIS. PANEL IS LOCATED RANGE 64 WEST AND RANGE 65 WEST ets• sit K - irk SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD Without Base Flood Elevation (B FE) nne .4. L 4?9 With BFE or Depth /one AE Ai: All, VE AF Regulatory Roadway 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 Map Projection NAD83 UTM Zone 13N Western Hemisphere: Vertical Datum NAVD88 1 inch = 500 feet 1:6,000 0 0 250 75 500 '150 1.000 Feet Meters 300 nsurance Program L) 0 0 IL cl3 0 co NATIONAL FLOOD INSURANCE PROGRAM FLOOD s.,,c,,n -,F RATE ^ WELD COUNTY, COLORADO And Incorporated Areas PANEL 1563 or 2250 Panel Contains COMMUNITY NUMBER PANEL SUFFIX KERSEY, TOWN OF 080185 1563 E WELD COUNTY 080266 1563 E REVISED TO REFLECT LOMR EFFECTIVE: November 2, 2023 VERSION NUMBER 1.1.1.0 MAP NUMBER 08123C1563E EFFECTIVE DATE JANUARY 20, 2016 FLOOD HAZARD INFORMATION NOTES TO USERS SCALE SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL STRUCTURES OTHER FEATURES SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT THE INFORMATION {OEPICd ED ON THIS MAP AND SUMMING DOCUMENTATION ARE ALSO AVM ILAHI.IE IN DIGITAL UORMATAI HTV PS://MS .°.MAIA.OOV lc Without Base Flood Elevation (BFE) Zone A, V, A99 With BFE or Depth Zone AE, AO, AH, VE, AR Regulatory Floodway 1 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 Zone X Future Conditions 1% Annual Chance Flood Hazard Zone X Area with Reduced Flood Risk due to Levee See Notes. Zone X Area with Flood Risk due to Levee Zone Area of Minimal Flood Hazard Zone X Area of Undetermined Flood Hazard Zone D Channel, Culvert, or Storm Sewer Levee, Dike, or Floodway 8.2 Cross Sections with 1% Annual Chance 17.5 Water Surface Elevation - Coastal Transect Coastal Transect Baseline Profile Baseline Hydrographic Feature ^^^^ 513^^^^N Base Flood Elevation Line (BFE) Limit of Study Jurisdiction Boundary For information and questions about this Flood Insurance Rate Map (FIRM), available products associated with this FIRM, including historic versions, the current map date for each FIRM panel, how to order products, or the National Flood Insurance Program (NFIP) 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 http://msc.fema.gov. 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. 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 the Flood Insurance Study Report for this jurisdiction. To determine if flood insurance is available in this community, contact your Insurance agent or call the National Flood Insurance Program at 1-800-638-6620. 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. NOTE: MAPAfREASHOWN (ON'THIS9RA,NEL;IS I_ ,CA WITH,IN^T® NSHI'P;5''NORiT-i OANG�E6 WE�S�T�.a I 1 N Map Projection: NAD83 UTM Zone 13N Western Hemisphere; Vertical Datum: NAVD88 1 inch = 500 feet 1:6,000 0 1,000 a 250 PANEL LOCATOR 2,000 Feet Meters 500 WELD COUNTY 1543 1731 1542 1561 1563 1775 trance Program NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP WELD COUNTY, COLORADO And Incorporated Areas PANEL 1544 OF 2250 Panel Contains: COMMUNITY GREELEY, CITY OF WELD COUNTY 0 NUMBER PANEL SUFFIX 080184 1544 E 080266 1544 E REVISED TO REFLECT FLEC LOPE ' EFFECTIVE: Movembes 2, 2©23 VERSION NUMBER 1.1.1.0 MAP NUMBER 08123C1544E EFFECTIVE DATE JANUARY 20, 2016 * PANEL NOT PRINTED Hello