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<br />, <br /> <br /> <br />Federal Emergency Management Agency <br />Washington, D.C. 20412 <br />JAN 11~Ul <br /> <br />CERTIFIED MAIL <br />RETURN RECEIPT REQUESTED <br /> <br />IN REPLY REFER TO: <br />Case No.: 00-08-375P <br /> <br />RI.:CEIVED <br />JAN 1 9 2001 <br /> <br />Colorado Water Consell <br />em...." fJ~~!rd <br /> <br />The Honorable Michelle Lawrence <br />Chairperson, Jefferson County <br />Board of Commissioners <br />100 Jefferson County Parkway, Suite 5550 <br />Golden, CO 80419 <br /> <br />Community: Jefferson County, CO <br />Community No.: 080087 <br />Panels Affected: 0255 Band 0260 B <br />Effective Date of <br />This Revision: MAY 0 3 2001 <br /> <br />102-I-A-C <br /> <br />Dear Ms. Lawrence: <br /> <br />This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective <br />Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for your community in <br />accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated <br />August 18, 2000, Ms. Paula Lundquist, Design Engineer, Department of Highways and Transportation, <br />Jefferson County, requested that FEMA revise the FIRM and FIS report to show the effects of a revised <br />hydraulic analysis based on updated topographic information along Lena Gulch from just upstream of <br />Orion Street to just downstream of U.S. Highway 6 (US6). This revised hydraulic analysis affects both <br />the unincorporated areas of Jefferson County and the City of Golden. The Special Flood Hazard Areas <br />(SFHAs), the areas that would be inundated by the flood having a I-percent chance of being equaled or <br />exceeded in any given year (base flood), for the subject reach within the unincorporated areas of <br />Jefferson County are designated on the effective FIRM as Zones A2, A4, and A9, SFHAs with Base <br />Flood Elevations (BFEs) and flood hazard factors determined. <br /> <br />All data required to complete our review of this request were submitted with letters from Mr. Douglas P. <br />Stewart, P .E., Project Manager, and Ms. Cara Juergensen, both with Boyle Engineering Corporation, and <br />Ms. Lundquist. <br /> <br />We have completed our review of the submitted data and the flood data shown on the effective FIRM <br />and FIS report. We have revised the FIRM and FIS report to modify the BFEs and SFHA boundary <br />delineations along Lena Gulch from just upstream of Orion Street to just downstream of US6. As a <br />result of the modifications, the BFEs for Lena Gulch and the width of the SFHA increased in some areas <br />and decreased in other areas. In the reach of Lena Gulch from just downstream to 1,400 feet downstream <br />ofUS6, floodwater splits out from the main channel just southeast ofMt. Vernon Road and flows to the <br />east, then rejoins the main channel approximately 1,200 feet upstream of Orion Street within the City of <br />Golden. This area, Lena Gulch Overflow, which extends approximately 1,600 feet downstream ofUS6, <br />has been designated Zone AH, an SFHA subject to shallow base flooding with depths between I foot and <br />3 feet and BFEs determined. The modifications are shown on the enclosed annotated copies of FIRM <br />Panels 0255 B and 0260 B and Profile Panels 189P through 192P. This Letter of Map Revision (LOMR) <br />hereby revises the above-referenced panels of the effective FIRM dated August 5, 1986, and the affected <br />portions ofthe FIS report dated July 4, 1989. <br />