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Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No,: 99-08-260P The Honorable Leona Stoecker Mayor, City of Longmont 350 Kimbark Street Longmont, CO 80501 Community: City of Longmont, Colorado Community No.: 080027 Panels Affected: 08013C0288 F and 0289 F E~ective pate of 0 C T 0 5 1999 ThtS 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) for Boulder County, Colorado and Incorporated Areas (the effective FIRM for your community), in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated April 21, 1999, Mr. David E. Hollingsworth, P.E., Drainage Engineer, Public Works Division, Department of Community Development, City of Longmont, requested that FEMA revise the FIRM to show the effects of updated topographic information associated with placement of fill in the overbanks of Lefthand Creek; construction of a cutoff channel parallel to South Main Street from Lefthand Creek to approximately 2,000 feet south; and channelization along Lefthand Creek from just downstream to approximately 1,200 feet downstream of South Main Street. This request follows up on a Conditional Letter of Map Revision issued on July 15, 1996. All data required to complete our review of this request were submitted with letters from Mr. Richard N. Wray, P.E., Principal, Kiowa Engineering Corporation, and Mr. Hollingsworth, We have completed our review of the submitted data and the flood data shown on the effective FIRM. 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 from approximately 1,300 feet upstream of its confluence with St. V rain Creek to just upstream of South Main Street. As a result of the modifications, the base flood elevations (BFEs) for Lefthand Creek and the width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, increased in some areas and decreased in other areas. The increases are a result of the placement of fill and channelization along Lefthand Creek. All property owners affected by the increases in BFE and SFHA width were notified. In addition, the SFHA resulting from the split flow from the main channel, located southeast of the intersection of South Main Street and Quail Road and extending approximately 3,500 feet east and approximately 500 feet south of the intersection, was removed. The modifications are shown on the enclosed annotated copies of FIRM Panel(s) 08013C0288 F and 08013C0289 F, This Letter of Map Revision (LOMR) hereby revises the above-referenced panel(s) of the effective FIRM dated June 2, 1995.