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Federal Emergency Management Agency Washington, D.C. 20472 MAY 092000 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 00-08-210P The Honorable Phil Stewart Mayor, City of Federal Heights 2380 West 90th A venue Federal Heights, CO 80221 Community: City of Federal Heights, CO Community No.: 080240 Panel Affected: 08001C0307 G Ef~ective.~ate of SEP 11 2000 ThIS RevIsIon: 102-I-A-C Dear Mayor Stewart: The Federal Emergency Management Agency (FEMA) has initiated this Letter of Map Revision (LOMR) to correct errors in the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for Adams County~Colorado and Incorporated Areas (the effective FIRM and FIS report for your community). FEMA is taking this action in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. During a recent review of the effective FIRM and FIS report, we determined that several streambed elevations used in the effective HEC-2 hydraulic model, prepared by MSM/SP Group, dated April 3, 1984, for Tributary M of Niver Creek (Tributary M) were not consistent with the information shown on the effective topographic work map entitled "Federal Heights Flood Insurance Study-l 00 Year Floodplain-Tributary M Niver Creek," also prepared by MSM/SP Group, dated April 5, 1984. These streambed elevations were corrected, and the effective hydraulic model was rerun to determine the correct effective elevations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Tributary M from approximately 250 feet downstream to approximately 120 feet upstream of Bryant Drive. We have completed our review of the flood data shown on the effective FIRM, FIS report, topographic work map, and hydraulic model. We have revised the FIRM and FIS report to modify the base floodplain boundary delineations and the base flood elevations (BFEs) along Tributary M from approximately 250 feet downstream to approximately 120 feet upstream of Bryant Drive. As a result ofthe modifications, the BFEs for Tributary M and the width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, increased. The modifications are shown on the enclosed annotated copies of FIRM Panel(s) 08001C0307 G and Profile Panel(s) l51P. This 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 following table is a partial listing of existing and modified BFEs: Location Existing BFE (feet) * Modified BFE (feet) * Approximately 100 feet downstream of Bryant Drive Just upstream of Bryant Drive 5,392 5,394 5,397 5,400 *Referenced to the National Geodetic Vertical Datum, rounded to the nearest whole foot