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Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 02-08-462P The Honorable Millie Bennett Mayor, Town of Castle Rock 100 North Wilcox Street Castle Rock, CO 80 I 04 Community: Town of Castle Rock, CO Community No.: 080050 Panel Affected: 0170 C Effective Date of JA N 2 I. 2003 This Revision: ., 102-I-C Dear Mayor Bennett: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) for your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated July 30, 2002, Mr. James Riley, Development Manager, Castle Rock Development Company, requested that FEMA revise the FIRM to show the effects of development of Meadows Subdivision Filings No.9 and No. 11 along 6400 Tributary East Fork from approximately 2,000 feet downstream to approximately 3,000 feet upstream of Cherokee Drive. The project included construction of eight drop structures and two inline detention ponds in the project reach. One detention pond is located just upstream of Cherokee Drive, and the other is located just upstream of Meadows Boulevard. In addition, two culverts were installed at road crossings: a 10- foot by 6- foot box culvert at Cherokee Drive and a 12- foot by 20- foot box culvert at Meadows Boulevard. All data required to complete our review of this request were submitted with letters from _ . r, P.E., Project Manager, Rocky Mountain Consultants, Inc. We have completed our review of the submitted data and the flood data shown on the effective FIRM. We have revised the FIRM to modify the floodplain boundary delineations of the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along 6400 Tributary East Fork in the above-referenced project area. As a result of the modifications, 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. The increases in SFHA width are contained within the requester's property. The modifications are shown on the enclosed annotated copy of FIRM Panel 0170 C. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel of the effective FIRM dated September 30, 1987. The modifications are effective as of the date shown above. The map panel listed above and as modified by this letter will be used for all flood insurance policies and renewals issued for your community. A review of the determination made by this LOMR and any requests to alter this determination should be made within 30 days. Any request to alter the determination must be based on scientific or technical data.