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<br />CHAPTER I <br /> <br />INTRODUCTION <br /> <br />of storage water on Grand Mesa for irrigation water from Vega <br />Reservoir. Total storage in the Grand Mesa reservoirs is <br />approximately 7,100 acre-feet. This system has provided an average <br />annual yield of approximately 15,100 acre-feet for power generation <br />over the 1974 to 1989 time period. <br /> <br />Vega Dam was constructed across the channel of Plateau Creek, <br />forming a reservoir with a total capacity of 33,800 acre-feet and <br />an active' capacity of 32,980 acre-feet. The reservoir stores <br />surplus flows of Plateau, Leon, and Park Creeks. The Leon and Park <br />Creek flows are brought to the reservoir through the 2.7-mile-long <br />Leon-Park Feeder Canal. The Souths ide Canal extends west from Vega <br />Reservoir 32.8 miles to a terminal drop structure on Mesa Creek <br />about 3.25 miles south of the town of Mesa, Colorado. The canal <br />crosses several north-flowing tributaries of Plateau Creek to which <br />releases are made, but flow is not intercepted. Most Collbran <br />Project water from Plateau, Leon, and Park Creeks, including both <br />storage and direct flow, is released from Vega Reservoir and <br />delivered by the Souths ide Canal. Some water is released at Vega <br />Reservoir into Plateau Creek for diversion by downstream ditches <br />and for instream flow purposes. <br /> <br />Water used for the generation of power is collected from the Big <br />and Cottonwooa-Creel{-arainage areas at elevations of more than --- <br />9,800 feet above sea level. These waters are stored by the 15 <br />previously existing reservoirs on Grand Mesa or collected by the <br />Bonham-Cottonwood pipeline and piped down the mesa slopes through <br />two hydroelectric powerplants and released into Plateau Creek. The <br />two powerplants have a combined capacity of 13,500 kilowatts. <br /> <br />Specific Collbran project components are described in further <br />detail below: <br /> <br />6 <br />