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Park. This leaves an active capacity of about 9,631 acre-feet. The water surface at the high <br />water line is about 217 acres. The absolute storage rights for the reservoir are shown below: <br />Jackson Gulch Reservoir Storage Rights <br />Name Adjud. Date Approp. Date Admin. No. Amount <br />(cfs) <br />Jackson Gulch Res. 03-22-1963 10-31-1936 31715.00000 9,980 <br />Jackson Gulch Res. 12-31-1991 12-31-1954 51499.38350 1,385 <br />The District also owns a number of conditional junior rights for the inlet canal and reservoir. <br />These rights provide for additional uses including hydropower generation. <br />Jackson Gulch Reservoir is operated such that filling normally begins in March or April <br />when the snowmelt conditions will allow diversions from the West Mancos River through <br />the inlet canal. The inlet canal is normally shut down during the winter months, December <br />through February. Diversions are made up to 258 cfs, depending on the available flows and <br />the demands for downstream senior water rights. The objective is to attempt to fill the <br />reservoir by June 1. It is also noted that even when the inlet canal is legally out of priority <br />with respect to other water rights on the stream, diversions are allowed to continue into the <br />reservoir so long as an equivalent release is made through the outlet (i.e. no depletion of the <br />diverted flow). This practice enables the district to maintain a fresher reservoir and at the <br />same time it absorbs some of the diurnal fluctuations of the stream, improving administration <br />of the water rights in the Mancos drainage. There are no other water rights in the intervening <br />reach of the West Mancos, between the inlet canal and the outlet canal. <br />The majority of the releases from Jackson Gulch Reservoir are made through the outlet canal <br />and delivered back to the West Mancos River where the water is re-diverted at downstream <br />irrigation ditches which own project water. According to records of the Mancos Water <br />Conservancy District, structures that are included in the San Juan Model have the following <br />allocations of Jackson Gulch Reservoir prof ect water: <br />Jackson Gulch Reservoir Project Allocations <br />(Structures Included in San Juan Model) <br />Name WDID Project Allocation <br />Lee and Burke Ditch 340542 83 <br />Webber Ditch 340576 2,255 <br />Ratliff and Root Ditch 340554 1,113 <br />Lee Ditch 340543 248 <br />Frank Ditch 340527 146 <br />Willis Ditch 340583 216 <br />Boss Ditch 340506 281 <br />San Juan & Dolores River Basin Information 2-10 <br />