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~ . t"l CJ Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: '~"3~Il8..l411p.. . Ms. M. Michael Cooke Chairperson, Douglas County Board of Commissioners 101 Third Street Castle Rock, Colorado 80104 Community: Douglas County, Colorado Community No.: 080049 Panel Affected: 0435 C Effective Date of This Revision: NOV 18 1994 102-D-A Dear Ms. Cooke: This is in response to a request for a revision to the effective Flood Insurance Study (FIS) and National Flood Insurance Program (NFIP) map for your community. Specifically, this responds to a letter dated July 27, 1994, from Mr. Daniel P. Giroux, P.E., Project Engineer, Tuttle Applegate, Inc., regarding the effective Flood Insurance Rate Map (FIRM) for the unincorporated areas of Douglas County, Colorado. Mr. Giroux requested that we revise the effective FIRM to show the effects of a revised hydraulic analysis based on more detailed topographic information along East Plum Creek from approximately 1,600 feet downstream to approximately 1,100 feet upstream of the confluence with Carpenter Creek. All data required to complete our review of this request were submitted with letters dated April 27 and July 27, 1994, and facsimile transmittals dated May 2, May 3, and October 28, 1994, from Mr. Giroux; with a letter dated February 16, 1994, from Mr. Stan Trueblood, Chairman of the Board, Larkspur Fire Protection District; with a letter dated August 4, 1993, from Mr. Evert L. Ackslan van Vriesland, Ackslan Industries; and with a letter dated October 11, 1994, from Mr. Fred Koch, P.E., County Engineer, Douglas County. Because this Letter of Map Revision (LOMR) solely incorporates more detailed information, fees were not assessed for the review. We have completed our review of the submitted data and the flood data shown on the effective FIRM, and have revised the FIRM to modify the elevations of a flood having a 1-percent probability of being equaled or exceeded in any given year (base flood) along Carpenter Creek from approximately 200 feet to approximately 700 feet upstream of the confluence with East Plum Creek. The base ClOO-year) flood elevations (BFEs) along this reach of Carpenter Creek are controlled by the flooding from East Plum Creek in the Town of Larkspur. As a result of this revision, the BFEs along the revised reach of Carpenter Creek have decreased. The BFEs and 100-year floodplain and floodway boundaries have been revised along East Plum Creek within the Town of Larkspur. These revisions are shown on the enclosed annotated copy of the Douglas County FIRM for informational purposes only.