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Federal Emergency Management Agency Washington, D.C. 20472 DEe 18 2003 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 03-08-0023P The Honorable Ed Moss Mayor, City of Westminster 4800 West 92nd Avenue Westminster, CO 80031 Community: City of Westminster, CO Community No.: 080008 Panels Affected: 08059C0091 E and 0093 E Effective Date of This Revision: APR 1 4 200It 102-I-A-C Dear Mayor Moss: This responds to a request that the Department of Homeland Security's Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for Jefferson County, Colorado and Incorporated Areas (the effective FIRM and FIS report for your community), in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated October 9,2002, Mr. David W. Loseman, P.E., L.S., Senior Projects Engineer, Floodplain Manager, Department of Community Development, City of Westminster, requested that FEMA revise the FIRM and FIS report to show the effects of channel modifications associated with the Sheridan Crossing development; drainage improvements along City Park Channel from approximately 2,000 feet downstream to approximately 450 feet upstream of Sheridan Boulevard; and construction of the Cozy Comer drainageway improvements. This request follows up on a Conditional Letter of Map Revision issued on January 27, 1997. The drainage improvements along City Park Channel included: widening of the channel; construction ofa low-flow chamlel; construction of three new road crossings located approximately 490 feet downstream, 930 feet downstream, and 1,870 feet downstream of Sheridan Boulevard; modifications to the existing culvert crossing at Sheridan Boulevard; and construction of the Clover Creek diversion flow structure and diversion channel to Cozy Creek Channel, located approximately 730 feet downstream of Sheridan Boulevard. The Cozy Comer drainageway improvements included the above-mentioned Clover Creek diversion structure a 8-foot by 5-foot reinforced-concrete box culvert (RCB), which extends from Ci1:Y Park Channel to approximately 830 feet south, and the Clover Creek diversion channel, which extends approximately 1,550 feet south from the RCB to the Clover Creek detention pond. Outflows from the Clover Creek detention pond will flow into Cozy Creek Channel approximately 2,900 feet upstream of the confluence with Big Dry Creek. The confluence of Cozy Creek Channel with Big Dry Creek is located approximately 5,200 feet downstream of ll2th Avenue. The Special Flood Hazard Area (SFHA), the area that would be inundated by the flood having a I-percent chance of being equaled or exceeded in any given year (base flood), shown on the effective FIRM along City Park Channel is designated Zone AE, with Base Flood Elevations (BFEs) determined. Areas 011 the effective FIRM that are affected by Clover Creek Channel and Cozy Comer Channel are designated Zone X (unshaded), areas outside the floodplain of the flood having a 0.2-percent chance of being equaled or exceeded in any given year.