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HYDROSPHERE Resource Consultants March 31, 1995 Mr. Roland C. Fischer Executive Director Colorado River Water Conservation District 201 Centennial Street, Suite 204 Glenwood Springs, CO 81602 Dear Mr. Fischer: We are pleased to submit herewith our final report for the Yampa River Basin Recommended Alternative Detailed Feasibility Study. Our report describes in detail the activities undertaken and conclusions reached over the course of the Study. The report document includes an Executive Summary and several technical appendices. 1 1 1 The Study examined geotechnical engineering and preliminary design issues associated with enlarging the existing Elkhead Reservoir, explored potential operating plans for the enlarged reservoir, and provided preliminary biological and environmental assessments of the enlargement project. Among the reservoir operations considered were the delivery of water to existing and future consumptive uses and releases to supplement instream flows in river reaches designated as critical habitat for endangered Colorado River fishes. We believe these analyses provide the foundation needed to move ahead with the enlargement of the reservoir and the development of an integrated water management plan for the Yampa River basin. We wish to express our appreciation for having had the opportunity to perform the Study and for the excellent guidance provided by the District's Project Manager, Mr. Ray Tenney. We also benefited from the oversight of the Study's Technical Steering Group and obtained invaluable assistance from our subcontractors, Doug Laiho of Muller Engineering, Bill Miller of Miller Ecological Consultants, Warren Keammerer of Keammerer Ecological Consultants, and Rich Tocher of Woodward-Clyde Consultants. We have thoroughly enjoyed our involvement in this interesting and important work and look forward to assisting the District in its future activities related to Yampa River basin water management. r r t 1 r Sincerely, Hydrosphere by: Charles M. Brendecke, PhD, PE President Policy Analysis • Engineering • Economics • information Systems 1002 Walnut, Suite 200 • Boulder, Colorado 80302 • (303) 443-7839 • Tele Fax (303) 4420616