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Federal Emergency Management Agency Washington, D.C. 20472 FEB 2 3 2000 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: CaseNo.: 99-08-410P The Honorable James Sullivan Chairman Douglas County Board of Commissioners 100 Third Street Castle Rock, CO 80104 Community: Douglas County, Colorado Community No.: 080049 Panel Affected: 0050 C Effective Date of J UN 2 9 2000 This Revision: l02-I-A-C Dear Mr. Sullivan: This responds to a requestthat the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated August 18, 1999, Mr. Bill DeGroot, PE, Chief, Floodplain Management Program, Urban Drainage and Flood Control District, requested that FEMA revise the FIRM and FIS report to show the effects of construction along Big Dry Creek of major drainageway features that consist of bank protection, grade-control structures, crossing structures, and detention facilities, including Pond 10just upstream of South University Boulevard, and revised hydrologic and hydraulic analyses for Big Dry Creek Tributary A and Big Dry Creek Tributary C (Tributary C). All data required to complete our review of this request were submitted with letters from Mr. DeGroot and , PE, Project Manager, WRC Engineering, Inc. 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 establish 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 Big Dry Creek from just upstream of County Line Road to Valley Road and along the entire reach of Tributary C. As a result of the modifications, base flood elevations (BFEs) and regulatory floodways were established for Big Dry Creek and for Tributary C, and the widths of the Special Flood Hazard Areas (SFHAs), the areas that would be inundated by the base flood, increased in some areas and decreased in other areas. The modifications are shown on the enclosed annotated copies of FIRM Panel( s) 0050 C, Profile Panel( s) 119Pthrough 126P, and affected portions of the Summary of Discharges Table and Floodway Data Table. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel(s) of the effective FIRM dated September 30, 1987, and the affected portions of the FIS report dated January 5, 1996. Because this revision request also affects the Cities of Englewood, Greenwood Village, and Littleton and the unincorporated areas of Arapahoe County, separate LOMRs for those communities were issued on the same date as this LOMR.