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Silver Jack Reservoir Elevation-Capacity-Area <br />Elevation Area Capacity <br />(feet) (acres) (acre-feet) <br />8802 1 0 <br />8810 5 25 <br />8820 14 113 <br />8830 29 324 <br />8840 (Inactive f) 43 683 <br />8850 62 1,200 <br />8860 83 1,930 <br />8870 107 2,870 <br />8880 133 4,070 <br />8990 164 5,560 <br />8900 195 7,350 <br />8910 229 9,470 <br />8920 268 11,950 <br />8926 (Normal WSE f) 293 13,520 <br />8930 314 14,860 <br />8950 367 18,270 <br />8950 417 22,190 <br />The reservoir outlet works to Cimarron River has a capacity ranging from 160 to 280 cfs, <br />depending on the reservoir elevation. The surface area at the normal maximum water <br />level is 293 acres. The reservoir holds an absolute storage right for 14,000 acre-feet and <br />a conditional right for an additiona130,600 acre-feet. Other project features include the <br />3.6-mile Bostwick Lateral and several miles of drains. <br />The Cimarron Canal is used to deliver supplemental irrigation water from Silver Jack <br />Reservoir to prof ect lands situated under the canal, the Bostwick Park area, and the Cedar <br />Creek area under the Hairpin Lateral. Most of the shareholders in the Cimarron Canal <br />Company own contract rights to prof ect water from Silver Jack Reservoir. One exception <br />is the City of Montrose, which does not receive reservoir storage water because <br />municipal use is not authorized for the project. <br />Because of its high elevation, Silver Jack Reservoir is inaccessible during the winter <br />months. During these months, the outlet valve is set to release at a rate of 17 cfs, which <br />is the approximate rate of inflow during the mid-winter months. This continuous release <br />maintains a minimum streamflow on the Cimarron and limits the accumulation of storage <br />during the winter. By late spring, the inflows increase and the reservoir is usually filled <br />by mid May. In late July, when the natural flow of Cimarron Creek begins to drop off <br />such that the Cimarron Canal cannot satisfy the irrigation demands using its direct flow <br />water rights, storage water is released from Silver Jack to supplement the direct flow <br />diversions. During the summer months, Silver Jack is operated such that a minimum <br />streamflow of 25 cfs below the head gate of the Cimarron Canal is maintained, if <br />possible. There is also a general understanding that 1,500 acre-feet of the active storage <br />capacity has been reserved by the USBR to assist in meeting this instream flow objective. <br />The right to this storage may have been conveyed to the Colorado Division of Wildlife. <br />It is also uncertain whether the project participants can encroach upon this 1,500 acre-feet <br />Gunnison River Basin Information 2-4 <br />