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t' Federal Emergency Management Agency Washington, D.C. 20472 FEB 01 2001 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 00-08-294P The Honorable Michelle Lawrence Chairperson, Jefferson County Board of Commissioners 100 Jefferson County Parkway, Suite 5550 Golden, CO 80419 Community: Jefferson County, CO Community No.: 080087 Panel Affected: 0165 B Effective Date of J UNO 6 2001 This Revision: 102-I-A-C Dear Ms. Lawrence: 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 your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated June 26, 2000, Mr. Ed Jennings, P.E., P.LS., requested that FEMA revise the FIRM and FIS report to show the effects of a revised hydraulic analysis that incorporated existing channel improvements, drop structures, and culverts along Van Bibber Creek Tributary (Tributary) from approximately 350 feet downstream of West 58th Place to just downstream of West 58th Avenue. The revised hydraulic analysis is considered a corrected effective model because all the channel improvements existed before detailed information was incorporated into the FIRM and FIS report in 1989. 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), for the subject reach is designated on the effective FIRM as Zone A2, an SFHA with Base Flood Elevations (BFEs) and flood hazard factors determined. All data required to complete our review of this request were submitted with letters from Mr. Jennings. 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 boundary delineations of the base flood along the Tributary from approximately 350 feet downstream of West 58th Place to just downstream of West 58th Avenue. As a result of the modifications, the BFEs for the Tributary increased, and the width of the SFHA increased in some areas and decreased in other areas. The modifications are shown on the enclosed annotated copies of FIRM Panel 0165 B and Profile Panels 434P, 435P, and 436P. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel of the effective FIRM dated August 5, 1986, and the affected portions of the FIS report dated July 4, 1989. 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.