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Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 00-08-2l7P The Honorable Noel 1. Busck Mayor, City of Thornton 9500 Civic Center Drive Thornton, CO 80229 Community: City of Thornton, CO Community No.: 080007 Panel Affected: 0800lC0330 G Effective Date of FEB 0 8 2001 This Revision: 102-I-C Dear Mayor Busck: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) for Adams 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 19, 2000, Mr. Thomas C. Fairley, P.E., Principal Engineer, Kiowa Engineering Corporation, requested that FEMA revise the FIRM to show the effects of placement of fill and rechannelization of Niver Creek from just upstream of the confluence of Tributary L to approximately 320 feet downstream ofInterstate Highway 25 (1-25), associated with the American Furniture Warehouse development. This request also included a hydraulic analysis of an existing 8-foot by 4-foot reinforced-concrete box culvert under 1-25. This request follows up on a Conditional Letter of Map Revision dated October 17, 1997. All data required to complete our review of this request were submitted with letters from Mr. Bill DeGroot, P.E., Chief, Floodplain Management Program, Urban Drainage and Flood Control District; Mr. Stephen Brown, Project Engineer, also with Kiowa Engineering Corporation; and Mr. Fairley. 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 floodplain boundary delineations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Niver Creek from just upstream of the confluence of Tributary L to approximately 100 feet upstream ofI-25. As a result of the modifications, the width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, for Niver Creek increased in some areas and decreased in other areas. All increases in SFHA width occur within the American Furniture Warehouse property, and no insurable structures are affected. The base flood is contained in the channel from approximately 250 feet upstream ofthe confluence of Tributary L to approximately 400 feet downstream ofI-25. The modifications are shown on the enclosed annotated copy of FIRM Panel 0800lC0330 G. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel of the effective FIRM dated August 16, 1995. We will not physically revise and republish the FIRM and Flood Insurance Study (FIS) report for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panel and FIS report warrant physical revision and republication in the future, we will incorporate the modifications made by this LOMR at that time.