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I I used by Denver as a source of water for exchange. When a senior downstream water right requests water Williams Fork Reservoir releases stored water to allow the Moffat Tunnel and the Roberts Tunnel to con- tinue diverting. I The C-BT system is similar to the Denver system. Granby Reservoir stores water for delivery to the Adams Tunnel a transmoun- tain diversion. Green Mountain Reservoir is available for use as exchange water should the need arise. Windy Gap is a junior water right which pumps water from the Fraser River into Granby Reservoir. I I Only about one third (50,000 acre-feet) of Green Mountain reservoir is used as C-BT exchange water. The remainder (about 100,000 acre-feet) is available for use by the Wes t Slope. At the present time the non-CBT water in Green Mountain Reservoir is released by the United States Bureau of Reclamation to generate power and occa- sionally to simultaneously meet downstream water requirements. I I I Green Mountain reservoir l,s a senior water right to Dillon Reservoir. This means that in t:lmes of shortage, Green Mountain Reservoir is permitted to fill while Dillon must suffer the shortage. An operating agreement exists which allows Dillon Reservoir to fill each spring, followed by Green Mountain reservoir. During those years when Green Mountain Reservoir does not fill, Denver is required to mitigate the damages by either releases from Dillon or by releases from Williams Fork Reservor and the generation of electric power. ,I I Rued! Reservoir functions as an exchange reservoir for the Frying-Pan Arkansas Project in a manner similar to Green Mountain Reservoir. There is more water in the reservoir than is necessary for exchange. This water is presently released for the generation of power and for other purposes. I I I I In a typical year the Shoshone Hydroelectric power plant, as a senior water right, places calls on the river during the low flow periods of the fall and winter. 'rhis prevents upstream reservoirs from storing additional water during the winter. During the spring snowmelt all the major reservoirs wlll usually fill unless they were exceptionally low the previous year, or the runoff is substantially below normal. Releases are made to meet demands through July. By late August, when irrigation demand,s are high, Cameo usually puts a call on the river. This prevents additional storage by all of the major reservoirs until mid October when the irrigation season ends. ,I III-6 I I I I A tabulation of water rights in each of the districts was developed using the computerized tabulation of rights available from the State Engineers Office (SEO) through Colorado State University (CSU). This tabulation is presented in Appendix C.