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Federal Emergency Management Agency Washington, D.C. 20472 CER TIFlED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 01-08-180P The Honorable Melanie Worley Chairman, Douglas County Board of Commissioners 100 Third Street Castle Rock, CO 80 I 04 Community: Douglas County, CO Community No.: 080049 Panel Affected: 0070 E Ef~ective.~ate of JU N 2 2 2001 ThIS RevIsIOn: 102-I-A-C Dear Ms. Worley: 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 your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated March 7, 2001, Mr. Tom Williams, Stormwater Utility Manager, Department of Public Works, Town of Parker, requested that FEMA revise the FIRM and FIS report to show the effects of channelization along Newlin Gulch from the confluence with Cherry Creek to approximately 1,800 feet upstream; construction of a pedestrian bridge across Newlin Gulch approximately 175 feet upstream of the confluence with Cherry Creek; and placement of fill within the floodway fringe of Cherry Creek from the confluence of Newlin Gulch to approximately 2,000 feet downstream. This request also included updated corporate limits information for the Town of Parker to reflect annexation of parcels of land from Douglas County. Although portions of the project area are shown on the effective FIRM for the unincorporated areas of Douglas County, they were annexed by the Town of Parker. This request follows up on a Conditional Letter of Map Revision issued on August 7,1998. All data required to complete our review of this request were submitted with letters from ~ 1 . P.E., Division Manager, JR Engineering, and Mr. Williams. . We have completed our review of the submitted data and the flood data shown on the effective FIRM and in the effective 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 Newlin Gulch and Cherry Creek. As a result of the modifications along Newlin Gulch, the Base Flood Elevations (BFEs) for Newlin Gulch and the widths of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, and the regulatory floodway increased in some areas and decreased in other areas. The base flood is contained within the channelized reach from the confluence with Cherry Creek to approximately 1,800 feet upstream. According to the updated corporate limits information for the Town of Parker, the channelized reach along Newlin Gulch lies entirely within the Town of Parker. The increases in BFE and SFHA width along Newlin Gulch are in the vicinity of Challenger Regional Park, from approximately 1,850 feet upstream to approximately 2,300 feet upstream of the confluence with Cherry Creek. No insurable structures are affected by the increased BFEs.