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Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No,: 96-08-047P The Honorable Bill Tallon Chairman, Archuleta Board of County Conunissioners P.O. Box 1507 Pagosa Springs, Colorado 81147 Conununity: Archuleta County, Colorado Conununity No.: 080273 Panels Affected: 0275 Band 0003 Effective Date of This Revision: J AN 23 1996 102-D-A Dear Mr. Tallon: 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 conununity. Specifically, this responds to a letter dated November 27, 1995, from Mr. Jay R. Harrington, Town Administrator, Town of Pagosa Springs, regarding the effective FIS report, Flood Insurance Rate Map (FIRM), and Flood Boundary and Floodway Map (FBFM) for the unincorporated areas of Archuleta County, Colorado. Mr. Harrington requested that the Federal Emergency Management Agency (FEMA) revise the effective FIRM and FBFM to show the effects of the placement of 42 rock structures along the San Juan River from approximately 3,440 feet downstream of Hot Springs Road to approximately 2,700 feet upstream of Pagosa Street. This request follows up on a Conditional Letter of Map Revision, which was issued on March 15, 1994. All data required to complete our review of this request were submitted with Mr. Harrington's November 27 letter and a facsimile dated December 20, 1995, from Mr. Don R. May, P.E, Because this Letter of Map Revision (LOMR) shows the effects of a publicly sponsored flood-control project that reduces flooding to existing development, 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 FBFM, and have revised the FIRM and FBFM to modify the elevations and floodplain and floodway boundary delineations of a flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along the San Juan River from approximately 250 feet upstream to approximately 2,700 feet upstream of Pagosa Street. The effect of the channel modification project on the unincorporated areas of Archuleta County is limited to the north bank ofthe San Juan River from approximately 250 feet upstream to approximately 2,700 feet upstream of Pagosa Street. As a result of the project, the base flood elevations (BFEs) decreased along the reach affecting the unincorporated areas of Archuleta County. The maximum decrease in BFE, 4 feet, occurs approximately 925 feet upstream of Pagosa Street. The width of the Special Flood Hazard Area (SFHA) and the floodway decreased on the north bank of the San Juan River from approximately 250 feet upstream to approximately 2,700 feet upstream of the Pagosa Street. The maximum decrease in SFHA width within the unincorporated areas of Archuleta County, 70 feet, occurs from approximately 1,700 feet upstream to approximately 2,600 feet upstream of Pagosa Street. The maximum decrease in floodway width in the unincorporated areas of the county, 20 feet, occurs approximately 2,050 feet upstream of Pagosa Street.