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r . ~ ,-, . OIl . Federal Emergency Management Agency Washington, nc 20472 RECEIVED MAR 1 8 1996 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No,: 95-08-283P Colorado Water Conservation Board The Honorable Marvin Kaye Mayor, City of Golden City Hall 911 10th Street Golden, Colorado 80401 Community: City of Golden, Colorado Community No,: 080090 Panel Affected: 0003 A Effective Date of This Revision: J p, N 111996 102-I-A-C Dear Mayor Kaye: 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 November 27, 1995, from Mr. Clay Wade, Director of Planning, Mesa Meadows Luxury Homes, regarding the effective FIS report and Flood Insurance Rate Map (FIRM) for the City of Golden, Colorado, Mr. Wade provided additional information to support an August 16, 1995, request for a Letter of Map Revision (LOMR) from Mr, Gary R Lake, P,E., Lake Engineering Consultants. Mr, Lake requested that the Federal Emergency Management Agency (FEMA) revise the effective FIRM to show the effects of channel modifications along Cressmans Gulch and Cressmans Gulch Old Channel, including construction of the Mesa Meadows Phase 2 subdivision, two 10-foot by 6-foot box culverts under Wyoming Street, and one 14-foot by 9-foot reinforced concrete box culvert under Mesa Drive, All data required to complete our review of this request were submitted with Mr. Lake's August 16 letter , and his facsimile dated December 8, 1995, and with Mr. Wade's November 27 letter. Because this LQMR 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 and floodplain boundary delineations of a flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Cressmans Gulch from approximately 250 feet upstream of its confluence with Tucker Gulch to approximately 320 feet upstream of Wyoming Street (limit of detailed study at City of Golden corporate limits) and along Cressmans Gulch Old Channel from its confluence with Cressmans Gulch to approximately 200 feet upstream of the confluence, As a result of the channel modifications, the base flood discharges from both Cressmans Gulch and Cressmans Gulch Old Channel have been diverted to a single improved channel through the culverts under Wyoming Street The combined base flood discharge is contained within the channel downstream of Wyoming Street to the limit of this revision approximately 250 feet upstream of the confluence of Cressmans Gulch with Tucker Gulch. Upstream of Wyoming Street, the base flood elevations (BFEs) decreased along Cressmans Gulch and increased along Cressmans Gulch Old Channel. Along Cressmans Gulch, the maximum decrease in BFE, 6 feet, occurs approximately 300 feet upstream of Wyoming Street Along Cressmans Gulch Old Channel, the maximum increase in BFE, 13 feet, occurs approximately 100 feet upstream of the confluence with Cressmans Gulch.