generation, recreation, and fish and wildlife. In recent years, however, water supply demands have shifted making municipal and industrial supply the main water beneficiary, rather than irrigation. Today, the "C-BT" serves over 33 cities and towns in northeastern Colorado, including Fort Collins, Greeley, Loveland, Estes Park, Boulder, and Sterling, encompassed by 7 counties, providing a secondary source of water for around 1 million people and an irrigated area of 640,000 acres (2,500 km²). Although water rights allow for up to of water a year to be diverted, annual diversions average around , instead. A drop of over 2000 vertical feet from the Rockies down to the plains allows for power generation. Seven power plants on the project produce an average supply of 759 million kilowatt hours of electricity a year. Like the water supply, generated electricity is supplemental. Electricity produced on the C-BT is a source of "peaking power" and is marketed by the Department of Energy via its Western Area Power Administration. Project features West-slope collection system An extensive series of reservoirs, pumps and conduits on the west side of the Rockies serve to collect water from the headwaters of the Colorado River, as well as two tributaries, Cottonwood Creek and the Fraser River. Lake Granby, located in eastern Grand County, is the primary C-BT storage facility, with a capacity of . The reservoir is held by the high Granby Dam and of auxiliary dikes. Willow Creek Reservoir is built on Willow Creek, which is located west of Lake Granby, and provides a source from which water is diverted and pumped to Granby. Windy Gap Reservoir is a small diversion facility located directly below the confluence of the Colorado and Fraser rivers, about downstream of Granby. Water from the Fraser River, as well as other inflows to the Colorado below Granby Dam, is diverted here and pumped eastwards to Lake Granby. The Windy Gap project is not owned by the Bureau of Reclamation, but by the Municipal Subdistrict, a consortium of 14 Front Range cities, water providers and an electric utility. However, Windy Gap water uses the storage and distribution facilities of the Bureau of Reclamation's C-BT. From Lake Granby the water is lifted up to Shadow Mountain Lake, which is located on the Colorado River west of the natural Grand Lake. The two bodies of water are connected by a short channel which allows water to flow freely