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<br />Western Slope Replacement Storage and Improvements <br /> <br />Green Mountain Reservoir, located on the Blue River about 16 <br />miles southeast of Krernmling, stores surplus Western Slope water <br />and releases the storage at appropriate times to avoid interference <br />by transmountain diversions with existing water rights on the. <br />Colorado River and to assist in new developments. The reservoir <br />covers an area of 2,125 acres at elevation 7950 and provides stor- <br />age for 154,600 acre-feet of water which is utilized to generate <br />hydroelectric energy at the Green Mountain Power Plant. <br /> <br />Completion of the reservoir and appurtenant works included <br />the construction of Green Mountain Dam and Power Plant, the Elliott <br />Creek Feeder Canal leading to the reservoir, improvements for <br />irrigated land along the Blue River below the reservoir, and the <br />relocation of 7.4 miles of State Highway No.9. <br /> <br />Green Mountain Dam (1938-1943) is a zoned and compacted <br />earth and rockfill type structure with a maximum height of 309 <br />feet above foundation, a crest length of 1,060 feet, and a volume <br />of 4,370,000 cubic yards. Its crest at elevation 7960 is topped <br />by a concrete parapet and curb and is traversed by relocated State <br />Highway No.9. Two 25-foot by 20-foot radial gates control the <br />concrete-lined, open-channel type spillway which has a length of <br />1,069 feet and a discharge capacity. of. 25,000 cfs. The outlet <br />works include a concrete-lined tunnel extending from an inlet trash- <br />rack structure in the reservoir to the powerhouse below the dam. <br />Upstream from a centrally located gate-chamber, the tunnel is 18 <br />feet in diameter and 651 feet long. The downstream portion is a <br />23.25 by 15.75-foot horseshoe section, 715 feet long. Two 102- <br />inch plate-steel conduits, installed in the horseshoe section, <br />serve as outlets for the reservoir and as penstocks for the power <br />plant. Two 44-inch tube valves provide for ths release of 1,530 <br />cfs of water past the power plant. Emergency control of .the outlet <br />works is provided by two 102-inch ~seal gates housed in the <br />gate-chamber which is located at the bottom of a vertical shaft <br />leading from the crest of the dam. <br /> <br />Irrigation facilities for lands along the Blue River below <br />Green Mountain Dam were improved to insure an adequate supply of <br />water at all stages of river flow. Seven automatic headgates were <br />installed, canal inlets to the headgate structures were recon- <br />structed, and supply canals leading from the headworks were improved. <br />Eleven miles below Green Mountain Dam, a cable suspension bridge <br />with. a.152-foot span was constructed to carry three 20-inch steel <br />pipes for the irrigation of lands on the west side of the Blue River. <br /> <br />.8 <br />