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le County, Colorado Ea Eagle and Colorado Rivers Floodplain Information Report Colorado Ea Eagle and Colorado Rivers Floodvlain Infprmation Report INTRODUCTION This report was authorized by the Colorado Water Conservation Board in joint sponsorship with the Eagle County, Colorado. for bringing about the and to designate available to to boards of (1) ( C The Board's power and duty is to devise and formulate methods, means and plans greater utilization of the waters of the state and prevention of flood damages there from and approve storm or floodway runoff channels or basins, and to make such designations legislative bodies of cities and incorporated towns; to county planning commissions; and adjustment of cities; incorporated towns; and counties of this state as stated in Section 37-60-105 of the Colorado revised Statutes 1973. the offices fee, at Copies of this report are available for public inspection or distribution, for a nominal listed below Eagle County Engineering Department 550 Broadway Eagle, Colorado 81631 (970) 328-3560 The cities, incorporated towns, and counties within the study area may provide zoning regulations to establish, regulate, restrict, and limit such uses on or along any stream or floodwater runoff channel or basin, as such storm or flood water runoff channel or basin, as such storm or floodwater runoff channel or basin has been designated and approved by the Colorado Water Conservation Board, in order to lessen or avoid the hazards to persons or damage to property resulting from the accumulation of storm or flood waters, as stated in Sections 30-28-111 and 31-23-201 of the Colorado Revised Statutes, 1975. Upon official approval of this report by the Colorado Water Conservation Board, the areas described as being inundated by the 100-year flood may be designated as flood hazard areas and their use regulated accordingly by local governmental entities. Colorado Water Conservation Board 1313 Sherman Street, Room 721 Denver, Colorado 80203 (303) 866-3441 Matrix Design Group, Inc. 1601 Blake Street, Suite 200 Denver, Colorado 80202 (303) 572-0200 This study of the Eagle and Colorado Rivers analyzed the flood hydraulics and completed GIS noodplain mapping for the following reaches Len~th 43.77 miles End Confluence with Colorado River Reach Eagle River 4.29 miles 1-70 Bridge Start Downstream of Minturn Eagle/Garfield County Line 1.3 Previous Studies Hydrologic and hydraulic analyses for the Eagle River in Eagle County were performed by Gingery Associates, Inc. for the Federal Insurance Administration. This work was published in 1978 and 1979 and covered significant flooding sources affecting the unincorporated areas of Eagle County. FEMA realized detailed floodplain mapping was needed for the reach of the Eagle River between Gypsum and the Town of Eagle. In 1997, J.F. Sato & Associates, Inc. contracted with FEMA under the "Limited Map Maintenance Program" (LMMP) to redefine the 100-year floodplain and floodway, beginning upstream of the Gypsum bridges and extending upstream to the Town of Eagle. A HEC-RAS model was developed and floodplain mapping prepared for submittal to FEMA. This study was completed in NGVD 1929, was never published by FEMA, and is replaced in its entirety by this study. ----=- 22,2003 August Page 4 M1 MlIixU.~~", ~""'"'--'._- ----- August 22, 2003 Page iii iM1~u.~('~ "1:-.v __ Authorization SECTION 1 1.1 PREFACE This report presents the results of a floodplain study for the Eagle River and Colorado River in Eagle County, Colorado. The Report was prepared by Matrix Design Group, Inc. of Denver, Colorado at the request of Eagle County in cooperation with the Colorado Water Conservation Board. 1.2 Sco IS 2002 and 13 LLC on May The hydrologic analysis completed by Water Resource Consultants available in its entirety along with the supporting technical data from Colorado River LLC Water Resource Consultants, 244 Hutton A venue Rifle, Colorado 81650 (970) 625-5433