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Associated Storage: On the west slope water from the Upper Colorado River is collected and <br />stored in the Western Slope Collection System, which includes Willow Creek, Shadow <br />Mountain Reservoir, Grand Lake, and Lake Granby. On the Eastern Slope, C-BT water <br />is stored in Carter Lake, Horsetooth Reservoir, Boulder Reservoir, Marys Lake, Lake <br />Estes, Pinewood Reservoir, and Flatiron Reservoir. <br />Compact and Other Legal Considerations: In 1938, NCWCD contracted with the Bureau of <br />Reclamation for the perpetual right to the use of the water yielded from the C-BT Project. <br />These rights provide for the diversion of up to 310,000 ac-ft of water annually to <br />supplement water supplies in northeastern Colorado. Storage and diversion of C-BT <br />water is made in compliance with State of Colorado water laws, Colorado River Basin <br />compacts, and Senate Document 80. By decree of U. S. District Court on October 12, <br />1955, and supplemented by an April 16, 1964 decree, the United States was granted the <br />right to the use of water from the Colorado River and blue River in connection with the <br />operation of the C-BT Project. The decree established a priority date of August 1, 1935. <br />The decree states that the Project will be operated in accordance with provisions in <br />Senate Document 80. <br />OPERATIONAL INFORMATION <br />Adams Tunnel transports water throughout <br />the year. USBR schedules flow through the <br />Adams Tunnel in a manner that water is <br />stored in the Project's east slope terminal <br />storage reservoirs to be available for <br />subsequent releases to meet the water <br />demands of Project allottees or their <br />designees. It is the goal of USBR to fill <br />Carter Lake by mid-February and Horsetooth <br />Reservoir by May 1. The diversion data <br />indicates two periods of lower flow, the first <br />occurring in the Spring and the second during <br />the Fall months. Every year, the USBR will Maintenance entrance for Alva B. Adams Tunnel, <br />stop all diversions through Adams Tunnel for near West Portal <br />the period of one week to 10 days so the <br />Tunnel can be inspected and repaired. This maintenance period often coincides with a point in <br />time after which key terminal reservoirs have reached full capacity. A second maintenance <br />period for the entire C-BT system occurs in the Fall, as a result flows through Adams Tunnel are <br />often reduced. <br />In addition to carrying C-BT project water, Adams Tunnel also carries Windy Gap water on a <br />space-available basis. During wet years when Lake Granby is full, there is no room for Windy <br />Gap water and opportunities to capture Windy Gap water supplies are lost. Windy Gap <br />diversions are included in the total diversions recorded through the tunnel, however, since 1985 <br />when the Windy Gap project began diverting water; Windy Gap water and C-BT water are <br />accounted for separately. <br />AdamsTunnel.doc 7 of 9 <br />