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(-\Jce,,,,,,, Co ""~IVJn\~ Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 00-08..o11P The Honorable Noel Busck Mayor, City of Thornton 9500 Civic Center Drive Thornton, CO 80229 Community: City of Thornton, Colorado Community No.: 080007 Panels Affected: 08001C0030 G and 0036 G E~ective,I?ate of [lEe 0 6 1999 This Revmon: 102-I-A-C Dear Mayor Busck: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (PIS) report for Adams 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 October 5, 1999, Mr, Frank Casteleneto, City Engineer, Public Works Deparbnent, City of Thornton, requested that FEMA reissue a Letter of Map Revision (LOMR) dated July 25, 1995 (Case No. 95..o8-l53P), that was superseded when the FIRM for Adams County, Colorado and Incorporated Areas became effective on August 16, 1995. The July 25 LOMR reflected the results of a revised hydraulic analysis that incorporated the effects of channel modifications along Big Dry Creek from the corporate limits of the City of Thornton at East 136th Avenue to the corporate limits just downstream of Interstate Highway 25 (1-25)_ All data required to complete our review of this LOMR request were submitted with letters from Mr. Casteleneto, Because this revision request is for reissuance of a superseded LOMR, no fees were assessed for the review. We have revised the FIRM and PIS report to modify the elevations and floodplain and floodway boundary delineations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Big Dry Creek from the corporate limits of the City of Thornton at East 136th Avenue to the corporate limits just downstream of 1-25. As a result of the modifications, the base flood elevations (BFEs) increased and decreased along the revised reach of Big Dry Creek, and the widths of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, and the regulatory floodway decreased. The SFHA boundary delineations shifted slightly just upstream of East 136th Avenue. No insurable structures were affected by the increases in BFE or shift in the SFHA. All affected property owners were notified before the July 25 LOMR was issued. The modifications are shown on the enclosed annotated copies of FIRM Panel(s) 0800lC0030 G and 0800lC0036 G, ProfIle Panel(s) 13P, and affected portions of the Sununary of Discharges Table and Floodway Data Table, This LOMR hereby revises the above-referenced panel(s) of the effective FIRM and the affected portions of the PIS report, both dated August 16, 1995.