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Home My WebLink About20222549.tiffFederal Emergency Management Agency Washington, D.C. 20472 August 24, 2022 CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Scott James Chair, Weld County Board of Commissioners P. O. Box 758 Greeley, CO 80632 RECEIVED SEP 0.6 2022 IN REPLY REFER TO: WELD COUNTY Case No.: 21-08-1198P COMMISSIONERS Community Name: Weld County, CO Community No.: 080266 Effective Date of This Revision: January 9, 2023 Dear Commissioner James: 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 panel(s) 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 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://isrtrt fema.rzov/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: Tom Parko, Jr. Floodplain Administrator, Director of Planning & Building Weld County Jake Maybach, P.E Senior Water Resources Engineer RS&H, Inc. Co t -t n ; Co.t ;o n S Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Marta Blanco Castano, LISP, CFM Flood Mapping Program Assistant Colorado Water Conservation Board Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection Section Colorado Water Conservation Board Cc : oat-s(RR) PI.. (T'P/voJIDn), X12 �2 2 P�rJatalCH/ER/DD) /6/22 2022-2549 i„e nos.. I tttective Date: January 9, 2023 I Case No.: 21-08-1198P LOMR-APP ' Federal Emergency Management Agency Washington, D.C. 20472 9Nn LETTER OF MAP REVISION DETERMINATION DOCUMENT COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION BASIS OF REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) BRIDGE FLOODWAY 1D HYDRAULIC ANALYSIS UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 080266 IDENTIFIER SH 60 Letter of Map Revision APPROXIMATE LATITUDE & LONGITUDE: 40.320, -104.811 SOURCE: USGS QUADRANGLE DATUM: NAD 83 ANNOTATED MAPPING ENCLOSURES ANNOTATED STUDY ENCLOSURES TYPE: FIRM" NO.: 08123C1704E DATE: January 20, 2016 TYPE: FIRM` NO.: 08123C1710E DATE: January 20, 2016 TYPE: FIRM* NO.: 08123C1725E DATE: January 20, 2016 Enclosures reflect DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 20, 2016 PROFILE(S): 152PAND 153P FLOODWAY DATA TABLE: 5 changes to flooding sources affected by this revision. * FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REVISED REACH South Platte River - from approximately 2,470 feet downstream to approximately 6,260 feet upstream of State Highway 60 SUMMARY OF REVISIONS Flooding Source Effective Flooding Revised Flooding Increases Decreases No Floodway Floodway YES NONE Zone A Zone AE YES YES No BFEs* BFEs YES NONE Zone A Zone X (Shaded) NONE YES * BFEs - Base 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 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.00v/flood- ihsurance. Patrick 'Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-10,11000 rage 2 or 4 i issue pate: August 24, 2022 I Effective Date: January 9, 2023 I Case No.: 21-08-1198P I LOMR-APP F9' Agency w Federal Emergency Management A g Y igNGJ4 Washington, D.C. 2O472 DS 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 base (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 toll free at 1-877-336-2627 (1-677-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 21-08-1198P 102 -I -A -C ro, o ul 4 I 'SSW Wale: August 24, 2022 I Effective Date: January 9, 2023 I Case No.: 21-08-1198P I LOMB -APP , ° Federal Emergency Management Agency s� 4 Washington, D.C. 20472 r9Nn stir °4 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. 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 September 17, 2020. 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. 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.gov/flood- insurance. Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1198P 102 -I -A -C Page 4 of 4 I Issue Date: August 24, 2022 Effective Date: January 9, 2023 Case No.: 21-08-1198P LOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 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 Greeley Tribune Dates: September 2, 2022 and September 9, 2022 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 httos://www.fema.ciov/flood- insuwice. Q/_off Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 21-08-1198P 102 -I -A -C FLOODING SOURCE FLOODWAY 1 -PERCENT -ANNUAL -CHANCE FLOOD WATER SURFACE ELEVATION CROSS SECTION SOUTH PLATTE DISTANCE' WIDTH (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) REGULATORY (FEET NAVD) WITHOUT FLOODWAY (FEET NAVD) WITH FLOODWAY (FEET NAVD) INCREASE {FEET) RIVER AC1 AC2 AC3 AC4 1,469,555 1,472,194 1,474,247 1,476,285 1,101 1,713 2,517 2,635 6,815 9,755 11,872 12,204 5.4 3.8 3.1 3.0 4,698.3 4,701.0 4,702.2 4,704.5 4,707.3 4,710.2 4,712.6 4,715.3 4,716.8 4,698.3 4,701.0 4,702.2 4,704.5 4,698.3 4,701.5 4,702.6 4,705.0 0.0 0.5 0.4 0.5 A AC5 AC6 AC7 AC8 AC9 1,478,329 1,480,247 1,481,424 1,483,933 2,150 770 1,553 3,033 2,792 8,886 5,330 9,284 14,885 11,397 4.1 6.9 3.9 2.5 3.2 4,707.3 4,710.2 4,712.6 4,715.3 4,716.8 4,707.7 4,710.5 4,712.7 4,715.6 4,717.0 0.4 0.3 0.1 0.3 0.2 t1,486,090 REVISED DATA REVISED BY LOMR DATED January 27, 2022 'Feet above confluence with Platt,. Pivar FEDERAL EMERGENCY MANAGEMENT AGENCY WELD COUNTY, CO AND INCORPORATED AREAS REVISED TO FLOODWAY DATAREFLECT LOMR EFFECTIVE: January 9, 2023 SOUTH PLATTE RIVER 4,725 4,720 4,715 4,710 4,705 w w z z O Q 4,700 4,695 4,690 4,685 4,680 1,475,500 1,476,000 1,476,500 1,477,000 1,477,500 1,478,000 1,478,500 1,479,000 1,479,500 1,480,000 1,480,500 1,481,000 1,481,500 1,482,000 r J_-4- DAT�D f W I- _ 0 • 4 L REVISE I+ �rt I 1 EAC 1_ 77 a 4,725 4,720 4,715. 4,710 • it • Yr r L }. - -Fi fi LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%, ANNUAL CHANCE FLOOD - - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - • - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD STREAM BED CROSS SECTION LOCATION 4,705 4,700 4,695 4,690 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER FLOOD PROFILES SOUTH PLATTE RIVER FEDERAL EMERGENCY MANAGEMENT AGENCY 0c w • F— • g O U o O U J Z W Z 152P 4,735 4,730 4,725 4,720 0 -4,715 w z_ z O 4,710 4,705 4,700 4,695 4,690 1,482,500 1,483,000 1,483,500 1,484,000 1,484,500 1,485,000 1,485,500 1,486,000 1,486,500 1,487,000 1,487,500 1,488,000 1,482,000 STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PLATTE RIVER LEGEND 0.2% ANNUAL CHANCE FLOOD -••-••-••-••- "1%, ANNUAL CHANCE FLOOD - 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD - - • - - • - 4% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD *\\,M,V STREAM BED CROSS SECTION LOCATION 4,735 4,730 4,725 4,720 4,715 4,710 4,705 4,700 1,488,500 FLOOD PROFILES SOUTH PLATTE RIVER O U z O U a J W AND INCORPORATED AREAS 153P =illken NOTE: MAP AREA SHOWN ON THISPANEL ISLOCATED W TONSHIP RTQHGE 4 NO, RAN66, WEST' A1W N`©`RTH, RANGE 67 WEST.," REWS1_-S REA 46 SCALE SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD Without Base Flood Elevation (BFE) With BFE or Depth bite AE. AU. AH, 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. Map Projection: NAD83 UTM Zone 13N Western Hemisphere: Vertical Datum: NAVD88 N1 Inch = 500 feet 1:6.000 0 250 500 1,000 Feet Met 150 300 ers p O O II C O co NATIONAL FLOOD INSURANCE PROGRAM NSURANCE RA WELD COUNTY, COLORADO Arid Incorporated Arr.,- PANEL 1704 or 2250 COMMUNITY NUMBER PANEL SUFFIX MILLIKEN, TOWN OF 080187 1/04 WELD COUNTY 080266 1704 REVISED TO REFLECT LOMR EFFECTIVE: January 9, 2023 VERSION NUMBER 1.1.1.0 MAP NUMBER 08123C1704E EFFECTIVE DATE JANUARY 20, 2016 r () NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 4 NORTH, RANGE 66 WEST AND TOWNSHIP 5 NORTH, RANGE 66 WEST. Weld``Coulnty Profile Areas Unincorporated Baseline p .�.�� ZONE AE a AREA REVISED BY LOMR DATED JANUARY 27, 2022 Profile Baseline 4713.9 ZONE A SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD SCALE MEM MIER Without Base Flood Elevation (B FE) ZoneA,V, A99 With BFE or Depth Zone AE, AO, AN VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1°ro 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 = 1,000 feet 1:12,000 500 1,000 150 300 2.000 Feet Meters 600 NATIONAL FLOOD INSURANCE PROGRAM FLOOD INS€.;; '\CE RATE MA' WELD COUNTY, COLORADO And Incorporated Areas PANEL 1710 of 2250 EVANS, CITY OF MILLIKEN, TOWN OF WELD COUNTY NUMBER 080182 080187 080266 R 1~ E NIA PANEL SUFFIX 1710 1710 1710 REVISED TO REFLECT LOMR EFFECTIVE: January 9, 2023 VERSION NUMBER 1.1.1.0 MAP NUMBER 08123C1710E EFFECTIVE DATE JANUARY 20. 2016 THIS AREA SHOWN AT A SCALE OF 1' = 500' ON MAP NUMBER 0812301704 Profile Baseline UNION PACIFIC RAILROAD ZONE AE THIS AREA SHOWN AT A SCALE OF 1' = 1000' ON MAP NUMBER 0812301710 NOTE: MAP AREA SHOWN ON THIS PANEL IS LOCATED WITHIN TOWNSHIP 4 NORTH, RANGE 66 WEST AND TOWNSHIP 4 NORTH, RANGE 67 WEST. REVISE AREA 20 SPECIAL ROOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD SCALE Without Base Rood Elevation (BFE) zone A, v. AS9 With BFE or Depth Zone AE, AO. AN. VE, AR Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1°%o 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 ga 2,000 feet 1:24,000 1,000 2,000 4000 Feet Meters 1,200 NATIONAL FLOOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP WELD COUNTY, COLORADO And Incorporated Areas PANEL 1725 OF 2250 Pane! Contains COMMUNITY GILCREST, CITY OF MILLIKEN. TOWN OF PLATTEVILLE, TOWN OF WELD COUNTY NUMBER 080213 080187 080190 080286 PANEL SUFFIX 1725 1725 1725 1725 REVISED TO REFLECT LOMR EFFECTIVE: January 9, 2023 VERSION NUMBER 1.1.1.0 MAP NUMBER 0812301725E EFFECTIVE DATE JANUARY 20. 2016 Hello