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Federal Emergency Managenlent Agency Washington, D.C. 20472 JUL 2 4 2003 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 03-08-0362P The Honorable John W. Hickenlooper Mayor, City and County of Denver City and County Building 1437 Bannock Street, Suite 350 Denver, CO 80202 Community: City and County of Denver, CO Community No.: 080046 Panels Affected: 0020 E and 0025 E Effective Date of ,J UI L 2 4 2003 This Revision: 102-I-A-C Dear Mayor Hickenlooper: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effectivl~ 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 April 10, 2003, , P.E., Project Engineer, ICON Engineering, Inc., requested that FEMA revise the FIRM and FIS report along Cherry Creek from approximately 1,430 feet downstream to approximately 570 feet upstream of the Highline Canal crossing to show the effects of channel mocifications associated with construction of Drop Structures 22 (D22) and 23 (D23). D22 and D23 are located approximately 680 feet downstream and approximately 100 feet downstream, respectively, of the Highline Canal crossing. The channel modifications included construction of two 6JfOuted boulder drop structures, demolition and reconstruction of two pedestrian bridges, and placemem of fill within the revi,;ed reach. This request follows up on a Conditional Letter of Map Revision issued on December 13, 2001. ThiE. Letter of Map Revision (LOMR) also is being issued to show two additional profile panels, Pands 11 Pea) and 1IP(b), for Cherry Creek that inadvertently were omitted from the effective FIS report dated September 7, 1998. These profile panels show the reach that extends from approximately 2,930 feet downstream of the Highline Canal crossing to approximately 4,000 feet upstream of State Highway 30. All data required to complete our review of this request were submitted with letters from 1 . . We have completed our review of the submitted data and the flood data shown on the effective FIRM and in the effective FIS report. We have revised the FIRM and FIS report to modify the elevations and floodplain boundary delineations of the flood having a I-percent chance of being e:qualed or exceeded in any given year (base flood) through the revised reach of Cherry Creek. As a result of the modifications, the Base Flood Elevations (BFEs) for Cherry Creek and 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