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" -. Federal Emergency Management Agency Washington, D,C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 99;~8~063P The Honorable John Brackney Chairman, Arapahoe County Board of Commissioners 5334 South Prince Street Littleton, CO 80 I 66 Community: Arapahoe County, CO Community No.: 080011 Panel Affected: 08005C0205 J E~ective.~ate of NOY 03 2000 This ReVISion: 102-I-A-C Dear Mr. Brackney: 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 Arapahoe County, Colorado and Incorporated Areas, in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a request dated November 23, 1998, Mr. Mark G. Talvitie, P.E., Area Manager, Washington Infrastructure Services (formerly MK Centennial), requested that FEMA revise the FIRM and FIS report to show the effects of construction of the E-470 bridge crossing and a channelization project along Murphy Creek from approximately 1,500 feet downstream to approximately 1,500 feet upstream ofE-470. This request follows up on a Conditional Letter of Map Revision issued on September 19, 1997. All data required to complete our review of this request were submitted with letters from Mr. Edward C. Stevenson, P.E., Design Director, and Mr. Michael E. Butters, Project Engineer, both also with Washington Infrastructure Services; Mr. Steven L. Gardner, P.E., Program Manager, Arapahoe County; and Mr. Talvitie. We have completed our review of the submitted 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 Murphy Creek. We also have modified the elevations and floodplain boundary delineations of the flood having a 0.2-percent chance of being equaled or exceeded in any given year. As a result of the modifications, the Base Flood Elevations (BFEs) for Murphy 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, and the width of the regulatory floodway decreased. The increases in BFEs and SFHA width are contained within property owned by the E-470 Public Highway Authority. Because the decreases in BFEs are not large enough to change the whole-foot BFEs shown on the effective FIRM, they will not be published in a local newspaper. Please note that we also have corrected an error in the BFEs shown for Cross Section M on the Floodway Data Table. The modifications are shown on the enclosed annotated copies of FIRM Panel 08005C0205 J, Profile Panels 135P and 136P, and affected portions of the Floodway Data Table. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel of the effective FIRM and the affected portions of the FIS report, both dated August 16,1995.