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lifts water 175 feet to the Willow Creek Supply Canal for delivery to Lake Granby. The pump <br />plant can be operated on site or remotely from the Farr Pump Plant. <br />Lake Granby (Structure ID 5103710) <br />Completed in 1949, Lake Granby is the second largest reservoir in Colorado, with a total storage <br />capacity of 539,800 ac-ft covering 7,260 surface acres. Only Blue Mesa Reservoir in <br />southwestern Colorado is larger. Lake Granby is located on the Colorado River approximately 4- <br />1/2 miles northeast of the town of Granby. Construction of the dam and reservoir, which cost <br />$12.9 million, had to be completed before water could be pumped to Shadow Mountain <br />Reservoir and Grand Lake. The Granby Dam and dikes are earth and rockfill structures. Water is <br />pumped from Lake Granby via the Farr Pump Plant (ID 5100678) located on its northern shore. <br />Pump head elevations vary from a minimum of 92 feet to a maximum of 186 feet depending <br />upon the reservoir's surface elevation. Pump capacity varies between 200 cfs and 1,000 cfs based <br />on the number of pumps operating and the water level in Lake Granby. <br />Water was first stored in Lake Granby on September 14, 1949. The Granby Pump Plant (re- <br />named the Farr Pump Plant in 1994) was completed the same year, and testing was conducted <br />during the spring and summer of 1951. Reclamation dedicated the plant in July 1951. <br />Shadow Mountain Reservoir (Structure ID 5103695) <br />Located strategically between Lake Granby and Grand Lake, Shadow Mountain Reservoir <br />receives water from the North Fork of the Colorado River and water pumped from Lake Granby. <br />Shadow Mountain acts as a regulating reservoir to help maintain a constant surface elevation in <br />Grand Lake -which by contract can fluctuate no more than one vertical foot, equivalent to 1,839 <br />ac-ft incremental storage capacity -while water is diverted through the Alva B. Adams Tunnel. <br />Shadow Mountain Reservoir has a drainage area of 187 square miles, a storage capacity of <br />18,400 ac-ft with a surface area of 1,852 acres. <br />Built between 1944 and 1946, the reservoir also serves as a conduit between Lake Granby and <br />Grand Lake. Shadow Mountain is one of the principal features of the C-BT's West Slope <br />collection and storage system. <br />Grand Lake (no Structure ID) <br />Grand Lake is the largest natural water body in Colorado. Because of the lake's scenic beauty <br />and proximity to Rocky Mountain National Park, C-BT Proj ect proponents agreed to minimize <br />fluctuations in the level of Grand Lake to one vertical foot. <br />Grand Lake is the last stop for C-BT water collected on the West Slope. It has a drainage area of <br />about 80 square miles, storage capacity of about 18,000 ac-ft with a surface area of 500 acres. <br />From Grand Lake water enters the West Portal of the Adams Tunnel. <br />1) Alva B. Adams Tunnel (Structure ID 5104634) <br />The 13.1-mile long, 9-foot 9-inch diameter Adams Tunnel is the lynchpin of the C-BT Project. <br />Constructed between 1940 and 1947, the tunnel drops 109 vertical feet from Grand Lake to the <br />East Portal, enabling gravity to carry water beneath the Continental Divide to the East Slope in <br />less than three hours. The tunnel's capacity is 550 cfs. <br />6of17 <br />