FLOOD04442 - Laserfiche WebLink

Home Browse Search

p....., . Q~,,"" "Dl-::C'i;;'~ < Federal Emergency Management Agency Washington, D,C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: '''9,'7~08"394P The Honorable Leona Stoecker Mayor, City of Longmont 350 Kimbark Street Longmont, CO 80501 Community: City of Longmont, Colorado Community No.: 080027 Panel Affected: 08013C0269 F Ef~ective.f!ate of MAY 14 1999 This ReVISIOn: 102-I-A-C Dear Mayor Stoecker: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for Boulder County, Colorado and Incorporated Areas (the effective FIRM and FIS report for your community), in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated August 26, 1997, Mr. Steven G. Smith, P.E., Project Engineer, QCI Development Services Group, Inc., requested that FEMA revise the FIRM and FIS report to show the effects of a revised hydraulic analysis along Lefthand Creek. The revised analysis incorporated updated topographic information and revised bridge modeling at the State Highway 119 (SH119) and Burlington Northern Railroad (BNRR) bridges. The revised analysis defined two channels along the overflow area shown on the effective FIRM. Lefthand Creek North Overflow Channel is created by floodwater that leaves the main channel just upstream of the southbound lane of SH119. Lefthand Creek South Overflow Channel is created by floodwater that leaves the main channel between the northbound lane of SHl19 and the BNRR. Both overflow channels rejoin the main channel just upstream of South Hover Road. All data required to complete our review of this request were submitted with letters from Mr. Peter Swift, P.E., Project Manager, Swift and Associates, and Mr. Smith. We have completed our review of the submitted data and the flood data shown on the effective FIRM and FIS report. We have revised the FIRM to modify the elevations and floodplain boundary delineations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Lefthand Creek North Overflow Channel from just upstream of South Hover Road to just downstream of the BNRR and along a portion of the ponding area just upstream of SHl19 southbound. As a result of the modifications, the base flood elevations (BFEs) for the revised reach increased in some areas and decreased in other areas, and the width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, decreased. The modifications are shown on the enclosed annotated copy of FIRM Panel(s) 08013C0269 F. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel(s) of the effective FIRM dated June 2, 1995. Because this revision request also affects the unincorporated areas of Boulder County, a separate LOMR for that community was issued on the same date as this LOMR. The modifications are effective as of the date shown above. The map panel(s) as listed above and as modified by this letter will be used for all flood insurance policies and renewals issued for your community.