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-, .-::) ..... Western SlODe ~enl~cement Storage and Imorovements CJl C) Green Mountain qeservoir, located on the Blue ~iver about 16 miles southeast of Kremmling, stores surplus Western Slope water and releases the s~orage at aopropriate times to avoid interference by transmountain diversions with existing water rights on the Colorado qiver and to a5~ist in new develoDments~ The reservoir COVers an area of 2,125 acres at elevation 7950 and provides stor- age for 154,600 acre-feet of water y~ich is utilized to generate hydroelectric energy at the Green Mountain Power Plant. Completion of the reservoir and acpurtenant works included the construction of Green Mountain Dam And Power Plant, the Elliott ~reek Feeder Canal leadin~ to the reservoir, improvements for irrigated l~~d alon~ the Blue qlver below the reservoir, and the relocation of 704 miles of State Highway No~ 9. Green \fountain Dam (1938-1943) is a zoned ;md compacted earth and rockfill typP- stru~ture with a maximum height of 309 feet above foundati.on, a crest length of l,060 feet, ;md a volume of 4,3?0,000 cubic yards. Its crest at elevation 7960 is tonned by a concrete parapet an1 curb and is traversed by relocated State Highway No.9. Two 25-foot by 20-foot ra~ial gMtes control the concrete-lined, aDen-channel type spillway which has a length of 1,069 feet and a discharge canacity of 25,000 cfs. The outlet works include a concrete-lined tunnel extending from an inlet trash- rack structure in the reservoir to the powerhouse below the dam. Upstream from a centrally located gate-chamber, the tunnel is 18 feet in diameter and 651 feet longo The downstrea,l1 portion is a 23.25 by 15075-foot horseshoe section, 715 feet long. Two 102- inch plate-steel conduits, installed in the horseshoe section, serve as outlets for the res~rvoir and as penstocks for the power plant. Two 44-inch tube valves provide for the release of 1,530 cfs of water past the power plant~ Emergency control of the outlet works is provided by two l02-incb ring-seal gates housed in the gate-chamber which is located at the bottom of a vertical shaft leading from the crest of the dam~ Irrigation facilities for lands along the Blue ~iver below G~een Mountain Dam were imnroved to insure an adecuate supply of water at all stages of river flcwo Seven automatic headgates were installed, c~~al inlets to the headgate structu"es were recon- structed, a~d suoply CAnals lea1ing from the headworks TIere improved. ~even miles below Green VountaLI na~, a cabl~ suspension bridge wlth a l52-foot S?2n was constructed to carry three 20-inch steel pines for the i~ri~ation of la~ds on the west side of the Blue ~iver. 8