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l 1 a <=> C-, "(;1\ en 1 UI ~ I 1 l J ] 'J .. ] J J j 'j , ..j J "j ",I . - Wolcott: The Wolcott Dam Site is 1 mile north of the town of Wolcott, Colorado, and 0.7 miles north of the Eagle River on Alkali Creek, a minor tributary of the Eagle River. The reservoir would serve as an off-stream storage site. Two reservoir sizes were considered in this Study. Low Wolcott would create a reservoir of 160,000 af capacity, supplied only with water pumped .from the Eagle River, while High Wolcott, 350,000 af capacity, wouid be supplied by pumping from both the Eagle and Colorado Rivers. The Colorado River conveyance would include 6.3 miles of tunnel from State Bridge, Colorado, which is north of the reservoir site. Una: The Una Dam Site is located on the Colorado River at the Mesa-Garfield county line. It lies between the towns of Parachute and DeBeque, Colorado, 35 miles northeast of Grand Junction, Colorado. Both dam abutments rise steeply from the 1100-foot wide valley floor. The reservoir would extend up the Colorado River valley to the town of Parachute. Reservoir capacities considered at this site ranged from 100,000 af to 196,000 af. 2.2 CONVEYANCE SYSTEM ALTERNATIVE DESCRIPTION The conveyance system is the pumpback element of the Green Mountain Exchange Project. It is a pump and pipeline system that would pump water from Green Mountain Reservoir to Dillo.n Reservoir. Both reservoirs are located on the Biue River, a tributary to the Colorado River. Green Mountain Reservoir is located 26 miles downstream of Dillon Reservoir. The difference in water surface elevation between the iwo reservoirs is 1070 feet. The Blue River flows from Dillon Reservoir to Green Mountain Reservoir, between the mountains of the Gore Range to the west and the Williams Fork Mountains to the east. The corridor along the river was judged to be the best general location for the conveyance pipeiine because it provides the shortest route, ready access and crosses the gentlest terrain. Within this corridor, two alternative routes were considered, the River Valley Route and the Highway Route. In addition a gravity canal was conceptually evaluated as an alternative. River Vallev Route - The proposed river valley route parallels the west shore of Green Mountain Reservoir and follows the Blue River to Dillon Reservoir. Along this route, the Slue River is crossed five times. This alternative presents environmental impacts associated with the removal of riparian growth, impacts on fisheries and water quality during the construction of river crossings, and soil erosion. It would also present visual impacts due to the removal of vegetation near the river. 2-3