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Federal Emergency Management Agency Washington, D.C. 20472 DEe 1 6 2005 The Honorable Am Menconi Chairman, Eagle County Board of Commissioners P.O. Box 850 Eagle, CO 81631 Dear Mr. Menconi: The Federal Emergency Management Agency (FEMA) is pleased to present you with three Revised Preliminary copies of the countywide FIRM panels for Eagle County, Colorado, and Incorporated Areas, including the technical changes described below. As part of the revision, we also have incorporated the Letter of Map Revision (LOMR) Case No. 04-08-0165P, dated April 9, 2004, for the Two Rivers Village. For your review, enclosed are the Revised Preliminary Flood Insurance Study (FIS) report and Revised Preliminary FIRM Panels 08037C0338 D, 0339 D, 0343 D, and 0526 D. These panels supersede only those previous Revised Preliminary FIRM panels dated September 30, 2004, with the same panel numbers; all other Preliminary panels remain valid. This letter is a follow-up to our letter to Mr. Michael Gallagher, former Chairman, Eagle County Board of Commissioners, dated of September 30, 2004, with which we transmitted Revised Preliminary FIRM panels and a Revised Preliminary FIS for Eagle County, Colorado, and Incorporated Areas. That Revised Preliminary FIRM was based on a report prepared by Matrix Design Group, Inc. (Matrix), dated August 22, 2003, for Eagle County and the Colorado Water Conservation Board. The report provided detailed flood elevations and floodplain boundary delineations for the flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along 46 miles of the Eagle River and 4 miles of the Colorado River. The Colorado River detailed analysis replaced existing approximate Zone A flooding shown on the effective FIRM dated January 25, 1983, which was later revised by the above referenced LOMR. The effects ofthe Two Rivers Village LOMR were not incorporated in the September 30 Revised Preliminary FIRM because the LOMR revised an approximate Zone A floodplain. The Matrix report had produced a detailed floodplain, that was incorporated into the September 30 Revised Preliminary FIRM. When we subsequently evaluated the supporting documentation for the LOMR, we recognized that it contained more detailed topography for the vicinity of the Two Rivers Village development than the Matrix report, and it could be incorporated into the Revised Preliminary FIRM. In addition to incorporating the more detailed topography for Two Rivers Village, we took the opportunity to re-evaluate the hydrologic record of flows on the Colorado River that are affected by regulation of the flows by manmade storage facilities. Discharges decreased upstream of the Eagle River and increased downstream of the Eagle River. The results were incorporated into the Colorado River hydraulic model produced by Matrix and into the Summary of Discharges Table in the Revised Preliminary FIS. The revised Colorado River profile was also incorporated. The Colorado River floodplain delineations have been modified based on the revised profile elevations. It is shown on the enclosed Revised Preliminary FIRM panels listed above. - To assist your community in maintaining the FIRM, we have enclosed a Summary of Map Actions (SOMA) to document previous Letter of Map Change (LOMe) actions (i.e., Letters of Map Amendment (LOMAs), LOMRs) that will be superseded when the revised FIRM panels referenced above become effective. Information on LOMCs is presented in the following four categories: (1) LOMCs for which results have been included on the revised FIRM panels; (2) LOMCs for which results could not be shown on the revised FIRM panels because of scale limitations or because the LOMC issued had determined that the lots or structures involved were outside the Special Flood Hazard Area (SFHA), the area subject to inundation by the base flood, as shown on the FIRM; (3) LOMCs for which results have not been included