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SUHMAl\Y SHEET Dorninr.ucz Re~ervoir Pro1ect March 1980 Page 1 of 2 LOCATION . The Domin~uez Reservoir Project is located in west~ central Colorado in Delta and Mesa Counties. be- tween the cities of Grand Junction and Delta. PURPOSE This multipurpose project would develop water of the Gunnison River. a major tributary of the Colo- rado River, for hydroelectric power, municipal and industrial use, recreation. and fish and wildlife enhancement. The proposed project plan has been developed in accordance with the Principles and Standards for Planning Water and Related Land Resources which emphasize public involvement. ~ The Dominguez Reservoir Project was authorized by the Water Resource Developments, Feasibility Studies Act of October 27, 1972 (Public Law 92- 577). . Feasibility investigations were initiated in Jan- uary 1975 with the formation of the multiobjective planning (}~P) team. The team has studied a multi- tude of alternativca in the planning process. These alternatives ~ill be presented in the feasi- bility report and the environ~ental impact state- ment. the alternatives to be covered include No Development, the Kon-Structural Plan, the En- vironmental Quality Effiphasis Plan, the National Economic Development Emphasis Plan, several other structural plans, and the recommended plan. The Feasibility Report ts scheduled for mid calendar year 1981. The Draft Environmental Impact State- ment and public meeting are due late calendar year 1981, and the Fi~a1 Environmental Impact Statement in mid calendar yeat 1982. The FY80 appropriations include $145,000 for cont~nued investigations. PLt\N The recoomended plan considers both economic de- velopment and environmental values. Two dams, two .reservoirs, and two powerplants would be con- structed for power generation. Dominguez Reser- voir, the larger of the two, would provide water for municipal and industrial use, with some rec- reational development of both the reservoir and the river below. The plan would provide for pres- ervation and enhancement of fish and wildlife potential above and below the reservoir and for preservation of cultural resources and scenic values of the area. The proposed Dominguez Dam on the Gunnison River near the ~ommunity of Whitewater would be a rolled earth and rockfill structure with the following approxicate dimensions: Hydraulic height Crest length Crest width Volume Total capacity 171 feet 1,170 feet 30 feet 3,000,000 cubic yards 302,000 acre-feet . Dominguez Reservoir would have a surface area of about 5,000 acres when full. A conventional pow~rplant with a maximum capacity of 18 megawatts would be situated nt the base of the dam, while a pumpb3ck peak-demand powerplant and reservoir (Rim Basin Reservoir) would be con- structed about 800 feet above Dominguez Reservoir and about 8 miles upstream from Dominguez Dam. These facilities would have an ultimate capacity of 500 megawatts and could be built in stages to satisfy future needs. Rim Basin Reservoir would be created by building Rim Basin Dam around a natural draw (channel) on the east canyon rim above the Gunnison River. The dam would be a horseshoe-shaped structure with an embankment of zoned earthfill. Preliminary studies indicate the dam would have the following approximate dimensions: Hydraulic height Crest length Crest width Volume Total capacity 230 feet 8,220 feet 25 feet 14,000,000 cubic yards 9,874 acre-feet Rim Basin Reservoir would have a surface area of 137 acres at normal water surface elevation 5,604 feet. A multilevel outlet works would be built at Domin- guez Dam to permit control of downstream river water temperature, thus maintaining native fish habitat. Some riparian lands would be acquired and develop- ed upstream from Dominguez Reservoir to Roubidoux Creek .and dmrostream from the dam to the Redlands Power Canal Divers~on Dam. Backwater areas and nesting structures would be developed for fish and wildlife, and wildlife zon.ing would be established around the reservoir for the protection of certain spe~ies such as the bald eagle. GRAND JUNCT I ON IS Power Plant o Pumping Plont ~i"C( R.f 81 I Pipeline I I I ~/~TE:TER J."~ ~~,;"-..~ .),~l-~ (~"\ ,~ (.. \i1~~ . '~p,-.,. OO/.1lNGUEZ-,ff,~' RESERVO/~R~''''''''' . J ~A . I l~ 1 ~/~ . ,\:,~ II i ~ff,rf\:;.~. . n". -~~ Q ~ ~ No t RIM BASIN RES. PUMP-BAC/( STORAGE . ..-/ ~"\o( "" . t.~ ~(.",..~ r:,r;;,'Uv;. ~,,"\" RR Relocotion 34