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<br />. <br /> <br />. <br /> <br />. <br /> <br />OO!250 <br />CHAPTER IV <br /> <br />IMPROVEMENT AND EXTENSION <br /> <br />and laterals for conveyance of stock water. This will reduce operating <br />requirements, provide more time for maintenance work, result in water <br />savings, and reduce the soluble salt content of water flowing from <br />the area. <br /> <br />Extension Plan <br /> <br />The plan for extension of the Uncompahgre Project outlined in <br />this report would involve construction of Dominguez Dam md Lake <br />and recreation facilities at several locations along the lake. The <br />lake would also provide municipal and industrial water, reservoir and <br />stream fishery, waterfowl habitat, stream flow regulation, and control <br />of water quality, sediment and debris. <br /> <br />The plan would offer potentialities for hydro-electric power <br />development but these potentialities are not evaluated in the present <br />report. A amall powerplant located at the toe of Dominguez Dam could <br />utilize releases from Dominguez Lake. A large pumped storage <br />development could be provided by construction of Gibbler Reservoir, <br />tunnels between Dominguez Lake and Gibbler Reservoir, and pumping- <br />generating units at the Dominguez Lake end of the tunnels. <br /> <br />Features of the extension plan and the potential associated hydro- <br />electric power developments are shown on the map on the following page. <br /> <br />Dominguez Dam and Lake <br />Dominguez Dam would be located on the Gunnison River about 10 <br />miles upstream from Grand Junction. The dam would create a reservoir <br />with a capacity of about 298,000 acre-feet. At its maximum water surface <br />elevation of 4,800 feet, the lake would cover an area of about 5.000 <br />acres in a canyon reach of the Gunnison River about 20 miles in length. <br /> <br />The dam would have a height of 177 feet above streambed, a crest <br />length of 1,170 feet, and would be a rolled-aarth and rockfill structure <br />with a volume of 3,070,000 cubic yards. The plan includes a concrete <br />spillway structure located on the right abutment of the dam that would <br />consist of a gate-controlled side channel inlet, an open rectangular <br />concrete chute, and a stilling basin at the downstream toe of the dam. <br />The spillway would have a discharge capacity of 75,000 c.f.s. Releases <br />from the lake would be _de through a tunnel outlet constructed in the <br />left abutment of the dam. Maximum releases of 1,500 c.f.s. from the <br />outlet could be directly to the Gunnison River or through a powerplant <br />at the toe of the dam. <br /> <br />Bedrock of the Dakota, Burro Canyon, and Morrison formation is exposed <br />on both abutments of the damsite. Drilling at the site has indicated <br />that gravelly stream fill materials in the canyon bottom have a maximum <br />depth of 68 feet over Morrison shale. Dam embanlanent materials would <br />be obtained from within the lake area and from tha tops of nearby mesas. <br /> <br />53 <br />