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<br />DESCRIPTION OF SYSTEM
<br />
<br />Basically, the system consists of a number of individual water
<br />resource projects that were planned and constructed by the Bureau
<br />of Reclamation. The individual projects were combined into an integ-
<br />rated system to achieve operating economy and to produce increased
<br />multiple-purpose benefits. The system is located generally in
<br />northern Colorado, across much of Wyoming, and in western Nebraska,
<br />as shown on the cover. It encompasses part of the Upper Colorado,
<br />Upper Missouri, and Lower Missouri Regions of the Bureau of Reclamation.
<br />
<br />The major storage reservoirs are located at relatively high elevations
<br />in the Rocky Mountains. In most areas of the system, 70 to 80 percent
<br />of the annual streamflow occurs from snowmelt runoff during the
<br />April-July period. The primary water use is irrigation, and the
<br />period of demand normally extends from May through September. The
<br />system furnishes irrigation water to over 1,200,000 acres of land in
<br />Colorado, Wyoming, and Nebraska.
<br />
<br />The system includes the Colorado-Big Thompson Project in Colorado;
<br />the Kendrick, Riverton, and Shoshone Projects in Wyoming; the North
<br />Platte Project in Wyoming and Nebraska; and the Kortes, Glendo, and
<br />Boysen Units of the Pick-Sloan Missouri Basin Program in Wyoming.
<br />The four major rivers in the system are the South Platte and Colorado
<br />Rivers in Colorado; the North Platte River in Colorado, Wyoming, and
<br />Nebraska; and the Bighorn River in Wyoming.
<br />
<br />There are 22 reservoirs, 15 powerplants, and 3 pumping plants in the
<br />system, as shown in tables 7 and 8. One-half of the installed
<br />capacity and power output of the Yellowtail Powerp1ant in Montana
<br />is also allocated to the Western Division System. The power features
<br />of the system are interconnected by over 3,500 miles of electrical
<br />transmission lines as shown on the map at the back of the report.
<br />The power system is also interconnected with other Federal, public,
<br />and private power systems. Bulk power from the Western Division is
<br />marketed to about 40 preference customers within the system and
<br />results in annual revenues of about $13 million. In addition to the
<br />power and energy available from the Western Division, power and
<br />energy from the Colorado River Storage Project is also available to
<br />most of the customers, except those in Nebraska. Demand for power
<br />and energy in the area is exceeding the power and energy available
<br />from the Western Diyision and the Colorado River Storage Project,
<br />and customers are supplying this demand from non-Federal thermal
<br />powerplants.
<br />
<br />7
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