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Home My WebLink About20240317.tiffFederal Emergency Management Agency Washington, D.C. 20472 RECEIVED January 29, 2024 CERTIFIED MAIL RETURN RECEIPT REQUESTED Kevin Ross Chair, Weld County Board of Commissioners P. O. Box 758 Greeley, CO 80631 Dear Kevin Ross: IN REPLY REFER TO: Case No.: 23-08-0274R Community Name: Weld County, CO Community No.: 080266 104 JAN 2 9 2024 WELD COUNTY 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 Study (FIS) report and 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.fema.gov/flood-insurance. 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: The Honorable Paul Rennemeyer Mayor, Town of Windsor Tom Parko, Jr., Planning Director Weld County Michelle Martin, P.E. Senior Engineer Anderson Consulting Engineers. Inc. Marta Blanco Castano, LISP, CFM Floodplain Mapping Program Assistant Colorado Water Conservation Board Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection Section Colorado Water Conservation Board Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board cc: O E M (RR), PL (ER/MN/oA(oAhm PW @H/DD) off./o5/24 co M )4u n; c oo-h ; o n S 02/12/2H 2024-0317 Page 1 of 8 'Issue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP friO�QA� tE' Federal Emergency Management Agency 45 .. °� Washington, D.C. 20472 �r7ND StiGJ CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) EXCAVATION GRADING 1D HYDRAULIC ANALYSIS FLOODWAY UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 080266 IDENTIFIER Eastman Park Phase II CLOMR APPROXIMATE LATITUDE 8 LONGITUDE: SOURCE: USGS QUADRANGLE DATUM: 40.461, -104.910 NAD 83 AFFECTED MAP PANELS TYPE: FIRM* NO.: 08123C1481F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1483F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1484F DATE: November 30, 2023 * FIRM - Flood Insurance Rate Map FLOODING SOURCES AND REACH DESCRIPTION See Page 2 for Additional Flooding Sources Cache La Poudre River —from approximately 3,370 feet downstream of Highway 257 to approximately 11,000 feet upstream of 7th Street PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Cache La Poudre River Excavation From approximately 110 feet upstream to approximately 1,440 feet upstream of 7th Street Grading From approximately 110 feet upstream to approximately 2,320 feet upstream of 7th Street SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Cache La Poudre River Floodway Floodway Yes Yes Zone AE Zone AE Yes Yes BFEs* BFEs Yes Yes Zone X (shaded) Zone X (shaded) Yes Yes * BFEs - Base (1 -percent -annual -chance) Flood Elevations 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/flood-insurance. .1t-141 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 2 of 8 Ilssue Date: January 29, 2024 (Case No.: 23-08-0274R I CLOMR-APP Federal Emergency Management Agency °¢F Washington, D.C. 20472 44ND5� CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) ADDITIONAL FLOODING SOURCES AFFECTED BY THIS CONDITIONAL REQUEST FLOODING SOURCES AND REACH DESCRIPTION Cache La Poudre River - North Eastman SFP — from the confluence with Cache La Poudre River to approximately 2,010 feet upstream Cache La Poudre River - Water Valley SFP — from the confluence with Cache La Poudre River to the divergence from the Cache La Poudre River SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Cache La Poudre River - North Eastman SFP Zone X (unshaded) Zone AE Yes None No BFEs BFEs Yes None Zone X(unshaded) Zone X(shaded) Yes None Cache La Poudre River - Water Valley SFP Floodway Floodway None Yes Zone AE Zone AE None Yes BFEs BFEs None Yes ' BFEs - Base (1 -percent -annual -chance) Flood Elevations 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/flood-insurance. ..—P.14/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23 08-0274R 104 Page 3 of 8 'Issue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP �' ` Federal Emergency Management Agency Washington, D.C. 20472 44ND StCJ CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST CID Number: 080264 Name: Town of Windsor, Colorado AFFECTED MAP PANELS TYPE: FIRM NO.: 08123C1481 F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1483F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1484F DATE: November 30, 2023 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 A 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/flood-insurance. /41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 4 of 8 Ilssue Date: January 29, 2024 'Case No.: 23-08-0274R l CLOMR-APP O�4A�\� .' Federal Emergency Management Agency °s. �� Washington, D.C. 20472 �t9ND SF%�� 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 used to prepare the Flood Insurance Study (FIS) (referred to as the effective model). If the effective model does not provide enough detail to evaluate the effects of the proposed project, an existing conditions model must be developed to provide this detail. This existing conditions model is then compared to the effective model and the proposed conditions model to differentiate the increases or decreases in flood hazards caused by more detailed modeling from the increases or decreases in flood hazards that will be caused by the proposed project. The table below shows the changes in the BFEs: BFE Comparison Table Flooding Source: Cache La Poudre River (CLPR) BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase 1.6 Approximately 590 feet upstream of the divergence of CLPR - Water Valley SFP Maximum decrease 0.1 Approximately 1,370 feet upstream of 7th Street Proposed vs. Existing Maximum increase 0.04 Approximately 590 feet upstream of the divergence of CLPR - Water Valley SFP Maximum decrease 0.03 Approximately 1,370 feet upstream of 7th Street Proposed vs. Effective Maximum increase 1.6 Approximately 590 feet upstream of the divergence of CLPR - Water Valley SFP Maximum decrease 0.2 Approximately 1,370 feet upstream of 7th Street Flooding Source: Cache La Poudre River - North Eastman SFP BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable Proposed vs. Existing Maximum increase None Not Applicable Maximum decrease 0.04 Approximately 1,960 feet upstream of the confluence with Cache La Poudre River Proposed vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable Flooding Source: Cache La Poudre River - Water Valley SFP BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable Proposed vs. Existing Maximum increase None Not Applicable Maximum decrease 0.2 Approximately 100 feet downstream from the divergence from Cache La Poudre River Proposed vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable 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.goviflood-insurance. :,:/41 Patrick 'Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 5 of 8 'Issue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP OYYARN,. Federal Emergency Management Agency Washington, D.C. 20472 F�tND CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) Increases due to the proposed project that exceed those permitted under Paragraphs (c)(10) or (d)(3) of Section 60.3 of the NFIP regulations must adhere to Section 65.12 of the NFIP regulations. With this request, your community has complied with all requirements of Paragraph 65.12(a) of the NFIP regulations. Compliance with Paragraph 65.12(b) also is necessary before FEMA can issue a Letter of Map Revision when a community proposes to permit encroachments into the effective regulatory floodway that will cause BFE increases in excess of those permitted under Paragraph 60.3(d)(3). 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/flood-insurance. .41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 6 of 8 Ilssue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP Federal Emergency Management Agency 4. t'NGJa`' 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 and FIS report. If the project is built as proposed and the data below are received, a revision to the FIRM and FIS report 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/flood-maps/change-your-flood-zone/paper-application-forms/mt-2. • 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/flood-maps/change-your-flood-zone/paper- application-forms/mt-2, 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, the 10 -percent, 4 -percent, 2 -percent, and 0.2 -percent -annual -chance floods, and the regulatory floodway, must be submitted with Form 2. • A certified topographic work map showing the revised and effective base and 0.2 -percent -annual -chance floodplain and floodway 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 and 0.2 -percent -annual -chance floodplain and floodway boundary delineations shown on the submitted work map and how they tie-in to the base and 0.2 -percent -annual -chance floodplain and floodway 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. • A copy of the public notice distributed by your community stating its intent to revise the regulatory floodway, or a signed statement by your community that it has notified all affected property owners and affected adjacent jurisdictions. • Documentation of the individual legal notices sent to property owners who will be affected by any widening or shifting of the base floodplain and/or any BFE increases along Cache La Poudre River, Cache La Poudre River —North Eastman SFP, and Cache La Poudre River— Water Valley SFP. 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/flood-insurance. 4/—"1.14/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23 08-0274R 104 Page 7 of 8 Ilssue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP 9,, Federal Emergency Management Agency Washington, D.C. 20472 4ND SGJ` 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/flood-maps/change-your-flood-zone/status/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: Colorado Water Conservation Board 1313 Sherman Street, Room 718 Denver, CO 80203 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 and FIS report. Because the flood hazard information (i.e., base flood elevations, base flood depths, SFHAs, zone designations, and/or regulatory floodways) 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/flood-insurance. 1;X —P—/4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 8 of 8 Ilssue Date: January 29, 2024 'Case., 23-08-0274R I CLOMR-APP � rt Federal Emergency Management Agency t Washington, D.C. 20472 41No OP 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: 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 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 eXchenge (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/flood-insurance. 11-P'./41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Federal Emergency Management Agency RECEIVED E C E I V E D Washington, D.C. 20472 January 29, 2024 JAN 2 9 2024 WELD COUNTY COMMISSIONERS IN REPLY REFER TO: Case No.: 23-08-0274R Community Name: Town of Windsor, CO Community No.: 080264 CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Paul Rennemeyer Mayor, Town of Windsor 301 Walnut Street Windsor, CO 80550 104 Dear Mayor Rennemeyer: 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 Study (FIS) report and 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.fema.gov/flood-insurance. 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: Kevin Ross Chair, Weld County Board of Commissioners Omar Herrera Deputy Director of Engineering Town of Windsor Michelle Martin, P.E. Senior Engineer Anderson Consulting Engineers. Inc. Marta Blanco Castano, LISP, CFM Floodplain Mapping Program Assistant Colorado Water Conservation Board Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection Section Colorado Water Conservation Board Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Page 1 of 8 Ilssue Date: January 29, 2024 'Case... 23-08-0274R I CLOMR-APP Federal Emergency Management Agency x°;Ft `NG�" Washington, D.C. 20472 9D 5� CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Town of Windsor Weld County Colorado EXCAVATION GRADING 1O HYDRAULIC ANALYSIS FLOODWAY UPDATED TOPOGRAPHIC DATA COMMUNITY NO.: 080264 IDENTIFIER Eastman Park Phase II CLOMR APPROXIMATE LATITUDE & LONGITUDE: SOURCE: USGS QUADRANGLE DATUM: 40.461, -104.910 NAD 83 AFFECTED MAP PANELS TYPE: FIRM' NO.: 08123O1481 F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1483F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1484F DATE: November 30, 2023 ' FIRM - Flood Insurance Rate Map FLOODING SOURCES AND REACH DESCRIPTION See Page 2 for Additional Flooding Sources Cache La Poudre River — from approximately 3,370 feet downstream of Highway 257 to approximately 11,000 feet upstream of 7th Street PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Cache La Poudre River Excavation From approximately 110 feet upstream to approximately 1,440 feet upstream of 7th Street Grading From approximately 110 feet upstream to approximately 2,320 feet upstream of 7th Street SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Cache La Poudre River Floodway Floodway Yes Yes Zone AE Zone AE Yes Yes BFEs` BFES Yes Yes Zone X (shaded) Zone X (shaded) Yes Yes • BFEs - Base (1 -percent -annual -chance) Flood Elevations 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/flood-insurance. <f -".""i4./ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 2 of 8 Ilssue Date: January 29, 2024 (Case No.: 23-08-0274R I CLOMR-APP otexitrk ci, Federal Emergency Management Agency Washington, D.C. 20472 tND 5�GJ CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) ADDITIONAL FLOODING SOURCES AFFECTED BY THIS CONDITIONAL REQUEST FLOODING SOURCES AND REACH DESCRIPTION Cache La Poudre River - Habitat Lake SFP — from the confluence with Cache La Poudre River to approximately 3,720 feet upstream Cache La Poudre River - North Eastman SFP — from the confluence with Cache La Poudre River to approximately 2,010 feet upstream Cache La Poudre River - Water Valley SFP — from the confluence with Cache La Poudre River to the divergence from the Cache La Poudre River SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Cache La Poudre River - Habitat Lake SFP Floodway Floodway Yes Yes Zane AE Zone AE Yes Yes BFES* BFES Yes None Zone X (shaded) Zone X (shaded) Yes Yes Cache La Poudre River - North Eastman SFP Zane X (unshaded) Zone AE Yes None Zone X (unshaded) Zone AO Yes None No BFES BFES Yes None Cache La Poudre River - Water Valley SFP Floodway Floodway Yes Yes Zone AE Zone AE Yes Yes BFES BFES Yes None Zoo X (shaded) Zone X (shaded) Yes Yes ' BFES - Base (1-percent-annuahchance) Flood Elevations 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 1-877,36-2627 (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 httpsilwww.fema.gov/flood-insurance. ./'-P.141 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 3 of 8 'Issue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP Federal Emergency Management Agency Ik Washington, D.C. 20472 ND 0 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST CID Number: 080266 Name: Unincorporated Areas of Weld County, Colorado AFFECTED MAP PANELS TYPE: FIRM NO.: 08123C1481F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1483F DATE: November 30, 2023 TYPE: FIRM NO.: 08123C1484F DATE: November 30, 2023 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/flood-insurance. .4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 4 of 8 Ilssue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP . Federal Emergency Management Agency °� 44- Washington, D.C. 20472 �4,ND 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 used to prepare the Flood Insurance Study (FIS) (referred to as the effective model). If the effective model does not provide enough detail to evaluate the effects of the proposed project, an existing conditions model must be developed to provide this detail. This existing conditions model is then compared to the effective model and the proposed conditions model to differentiate the increases or decreases in flood hazards caused by more detailed modeling from the increases or decreases in flood hazards that will be caused by the proposed project. The table below shows the changes in the BFEs: BFE Comparison Table Flooding Source: Cache La Poudre River (CLPR) BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase 1.6 Approximately 590 feet upstream of the divergence of CLPR - Water Valley SFP Maximum decrease 1.6 Approximately 2,110 feet upstream of the confluence of CLPR - Habitat Lake SFP Proposed vs. Existing Maximum increase 0.1 Approximately 60 feet downstream of 7th Street Maximum decrease 0.04 Approximately 790 feet upstream of 7th Street Proposed vs. Effective Maximum increase 1.6 Approximately 590 feet upstream of the divergence of CLPR - Water Valley SFP Maximum decrease 1.6 Approximately 2,110 feet upstream of the confluence of CLPR - Habitat Lake SFP Flooding Source: Cache La Poudre River - Habitat Lake SFP BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase 1.4 Approximately 2,390 feet upstream of the confluence with Cache La Poudre River Maximum decrease 3.0 Approximately 2,250 feet upstream of the confluence with Cache La Poudre River Proposed vs. Existing Maximum increase 0.1 Approximately 2,250 feet upstream of the confluence with Cache La Poudre River Maximum decrease 0.02 Approximately 270 feet upstream of the confluence with Cache La Poudre River Proposed vs. Effective Maximum increase 1.4 Approximately 2,390 feet upstream of the confluence with Cache La Poudre River Maximum decrease None Not Applicable Flooding Source: Cache La Poudre River - North Eastman SFP BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable Proposed vs. Existing Maximum increase None Not Applicable Maximum decrease 0.04 Approximately 1,200 feet upstream of the confluence with Cache La Poudre River Proposed vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable 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/flood-insurance. ^/41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 5 of 8 Ilssue Date: January 29, 2024 'Case... 23 -0B -0274R I CLOMR-APP YARN. Federal Emergency Management Agency ��. ',k� Washington, D.C. 20472 1ND 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 used to prepare the Flood Insurance Study (FIS) (referred to as the effective model). If the effective model does not provide enough detail to evaluate the effects of the proposed project, an existing conditions model must be developed to provide this detail. This existing conditions model is then compared to the effective model and the proposed conditions model to differentiate the increases or decreases in flood hazards caused by more detailed modeling from the increases or decreases in flood hazards that will be caused by the proposed project. The table below shows the changes in the BFEs: BFE Comparison Table Flooding Source: Cache La Poudre River - Water Valley SFP BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase 0.02 Approximately 750 feet upstream of the confluence with Cache La Poudre River Maximum decrease 0.8 Approximately 2,070 feet downstream of 7th Street Proposed vs. Existing Maximum increase 0.01 Approximately 5,300 feet downstream of 7th Street Maximum decrease 0.2 Approximately 1,450 feet upstream of 7th Street Proposed vs. Effective Maximum increase 0.02 Approximately 750 feet upstream of the confluence with Cache La Poudre River Maximum decrease 0.8 Approximately 2,070 feet downstream of 7th Street Increases due to the proposed project that exceed those permitted under Paragraphs (c)(10) or (d)(3) of Section 60.3 of the NFIP regulations must adhere to Section 65.12 of the NFIP regulations. With this request, your community has complied with all requirements of Paragraph 65.12(a) of the NFIP regulations. Compliance with Paragraph 65.12(6) also is necessary before FEMA can issue a Letter of Map Revision when a community proposes to permit encroachments into the effective regulatory floodway that will cause BFE increases in excess of those permitted under Paragraph 60.3(d)(3). 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/nood-insurance. 6;-/'./41 Patrick "Rick" F. Sacbibil, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 6 of 8 'Issue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP 9. 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 and FIS report. If the project is built as proposed and the data below are received, a revision to the FIRM and FIS report 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, Foss 1, entitled "Overview and Concurrence Form," must be included. A copy of this form may be accessed at https://www.fema.gov/flood-maps/change-your-flood-zone/paper-application-forms/mt-2. • 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/flood-maps/change-your-flood-zone/paper- application-forms/mt-2, or annotated copies of the previously submitted forms showing the revised information. Foss 2, entitled "Riverine Hydrology and Hydraulics Form." Hydraulic analyses for as -built conditions of the base flood, the 10 -percent, 4 -percent, 2 -percent, and 0.2 -percent -annual -chance floods, and the regulatory floodway, must be submitted with Form 2. • A certified topographic work map showing the revised and effective base and 0.2 -percent -annual -chance floodplain and floodway 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 and 0.2 -percent -annual -chance floodplain and floodway boundary delineations shown on the submitted work map and how they tie-in to the base and 0.2 -percent -annual -chance floodplain and floodway 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. • A copy of the public notice distributed by your community stating its intent to revise the regulatory floodway, or a signed statement by your community that it has notified all affected property owners and affected adjacent jurisdictions. • Documentation o€ the individual legal notices sent to property owners who will be affected by any widening or shifting of the base floodplain and/or any BFE increases along Cache La Poudre River, Cache La Poudre River — Habitat Lake SFP, Cache La Poudre River — North Eastman SFP, and Cache La Poudre River — Water Valley SFP. 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/flood-insurance. C;/--,./4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 7 of 8 Ilssue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP RA�\ Federal Emergency Management Agency �R1 Washington, D.C. 20472 �7ND sEcJ 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/flood-maps/change-your-flood-zone/status/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: Colorado Water Conservation Board 1313 Sherman Street, Room 718 Denver, CO 80203 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 and FIS report. Because the flood hazard information (i.e., base flood elevations, base flood depths, SFHAs, zone designations, and/or regulatory floodways) 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/flood-insurance. 1/—',1-141i Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Page 8 of 8 Ilssue Date: January 29, 2024 'Case No.: 23-08-0274R I CLOMR-APP O�yAj^kE' Federal Emergency Management Agency s'. Washington, D.C. 20472 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: 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 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/flood-insurance. 1/-',./41/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0274R 104 Hello