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The lands irrigated under the Summit Reservoir system are generally located to the west and <br />southwest of Summit and Puett reservoirs on the terrace ground tributary to Stinking Springs <br />Canyon, Cash Canyon and Simon Draw. Simon Draw is generally the dividing point between <br />the Summit system and the MVIC system. Total deliveries made to the Summit Irrigation <br />system serve lands that are tributary to McElmo Creek via Simon Draw (approximately 75 <br />percent), tributary to Mancos River (approximately 23 percent) and tributary to the Dolores <br />River via Canyon Creek (approximately 2 percent). <br />2.4 Jackson Gulch Reservoir (Mancos Project) <br />Jackson Gulch Reservoir is the principal feature of the Mancos Project, constructed by the <br />USBR in the late 1940's. The reservoir stores surplus water available during the spring runoff <br />months and subsequently releases that water to supplement the late summer irrigation water <br />demands a number of senior water rights on the Mancos River near the town of Mancos. A <br />portion of the project water supply can also be delivered, by exchange, to a number of <br />upstream water users. The reservoir also provides reserve storage for municipal uses by the <br />town of Mancos. The project, which provides supplemental irrigation water supplies to an <br />estimated 7,000 to 9,000 acres, is managed by the Mancos Water Conservancy District. <br />Diversions to reservoir are made through the Jackson Gulch Reservoir Inlet Canal (WDID <br />340535), which diverts from the West Mancos River about 2.5 miles upstream from the <br />reservoir. The ditch has a design capacity of about 258 cfs. The absolute water rights decreed <br />for diversion at the inlet canal are summarized as follows: <br />Jackson Gulch Inlet Water Rights <br />Name Adjud. Date Approp . Date Admin. No. Amount <br /> (cfs) <br />Jackson Gulch Inlet 04-28-1893 OS-15- 1887 9997.00000 3.91 <br />Jackson Gulch Inlet 04-28-1893 OS-15- 1880 11093.00000 0.67 <br />Jackson Gulch Inlet 04-28-1893 06-15- 1881 11489.00000 0.50 <br />Jackson Gulch Inlet 04-28-1893 OS-15- 1882 11823.00000 0.67 <br />Jackson Gulch Inlet 04-28-1893 OS-15- 1888 14015.00000 4.67 <br />Jackson Gulch Inlet 03-22-1963 10-31- 1936 31715.00000 258.17 <br />Jackson Gulch Inlet 12-31-1991 12-31- 1971 51499.44559 258 <br />The first five water rights listed are all senior irrigation rights that were either transferred to <br />the Inlet Canal or water rights that named the Inlet Canal as an alternate point of diversion. <br />These rights are not owned by the Mancos Water Conservancy District. They are owned by <br />individuals under the Crystal Creek Ditch that have negotiated a carriage contract with the <br />District for delivery of these rights through the prof ect inlet and/or outlet canals. <br />Jackson Gulch Reservoir (WDID 343589) was constructed at the headwaters of Jackson <br />Gulch and has an estimated total capacity of 9,980 acre-feet. There is an estimated dead <br />storage/reserve of about 349 acre-feet, including 29 acre-feet of dead storage, 200 acre-feet <br />reserved by the United States and 120 acre-feet reserved for use by Mesa Verde National <br />San Juan & Dolores River Basin Information 2-9 <br />