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; ,>- Federal Emergency Management Agency Washington, D.C, 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No,: 97-08-024P The Honorable Margaret Carpenter Mayor, City of Thornton 9500 Civic Center Drive Thornton, Colorado 80229 Community: City of Thornton, Colorado Community No,: 080007 Panels Affected: 0800lC0039 G and 0800IC0045 G Effective Date of This Revision: MAR 13 1997 102-I-A-C Dear Mayor Carpenter: 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 Adams County, Colorado and Incorporated Areas, in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations, In a letter dated January 24, 1997, Mr. Brian J. Poling, P.R, Project Engineer, Merrick & Company, requested that FEMA revise the FIRM and FIS report to show the effects of the construction of a floodwall at Colorado Boulevard, updated topographic information along Grange Hall Creek from approximately 500 feet downstream of East 108th Avenue to approximately 600 feet upstream of the confluence with Grange Hall Tributary, and updated topographic information along Grange Hall Creek Tributary from the confluence with Grange Hall Creek to approximately 800 feet upstream of the confluence. This request follows up on a Conditional Letter of Map Revision issued on March 25, 1996, We have completed our review of the subffiitted data and the flood data shown on the effective FIRM and FIS report. We have revised the FIRM and FIS 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 Grange Hall Creek and Grange Hall Creek Tributary, As a result of the modifications, the base flood elevations (BFEs) for Grange Hall Creek and Grange Hall Creek Tributary increased in some areas and decreased in other areas; 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; and the width of the regulatory floodway increased in some areas and decreased in other areas, The modifications are shown on the enclosed annotated copies of FIRM Panel(s) 08001 C0039 G and 08001 C0045 G; Prof1le Panel(s) 055P, 056P, 057P and 067P; and affected portions of the Floodway Data Table, In addition, Prof1le Panel 160P has been added for the 109th Avenue flow. This Letter of Map Revision (LOMR) hereby revises the above.referenced panel(s) of the effective FIRM and the affected portions of the FIS report, both dated August 16, 1995. 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.