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OM4'H JACKSON GULCH RESERVOIR (MANCOS PROJECT) Jackson Gulch Reservoir is the principal feature of the Mancos Project, constructed by the USSR in the late 1940's. The reservoir stores surplus water available during the spring runoff months and subsequently releases that water to supplement the late summer irrigation water demands a number of senior water rights on the Mancos River near the town of Mancos. A portion of the project water supply can also be delivered. by exchange, to a number of upstream water users. The reservoir also provides reserve storage for municipal uses by the Town of Mancos. The project. which provides supplemental irrigation water supplies to an estima~ed 7.000 to 9,000 acres, is managed by the Mancos Water Conservancy District. Diversions to reservoir are made through the Jackson Gulch Reservoir Inlet Canal (WOlD 340535), which diverts from the West Mancos River about 2.5 miles upstream from the reservoir. The ditch has a design capacity of about 258 cfs (USSR). The absolute water rights decreed for diversion at the inlet canal are summarized as follows: NAME ADJUDICATION APPROPRIATION ADMINISTRATION PM1JII1" DATE DATE NUMBER Jackson Gulch Inlet 04-28-1893 05-15-1887 9997.00000 3.91 cfs Jackson Gulch Inlet 04-28-1893 05-15-1880 11093.00000 0.67 cfs Jackson Gulch Inlet 04,28,1893 06-15,1881 11489.00000 0.50 cfs Jackson Gulch Inlet 04,28,1893 05-15,1882 11823.00000 0.67 cfs Jackson Gulch Inlet 04-28-1893 05-15-1888 14015.00000 4.67 cfs Jackson Gulch Inlet 03-22-1963 10-31-1936 31715.00000 258.17 cfs Jackson Gulch Inlet 12-31-1991 12-31-1971 51499.44559 258 cfs The first five water rights listed are all senio'r irrigation rights that were either transferred to the Inlet Canal or water rights that named the Inlet Canal as an alternate point of diversion. These rights are not owned by the Mancos Water Conservancy District. They are owned by individuals under the Crystal Creek Ditch that have negotiated a carriage contract with the District for delivery of these rights through the Project inlet and/or outlet canals. Jackson Gulch Reservoir (WOlD 3435891 was constructed at the headwaters of Jackson Gulch and has an estimated total capacity of 9,980 acre-feet. There is an estimated dead storage/reserve of about 349 acre-feet, including 29 acre-feet of dead storage, 200 acre-feet reserved by the United States and 1 20 acre,feet reserved for use by Mesa Verde National Park. This leaves an active caoacitv of about 9,631 acre-feet. The water surface at the high water line is about 217 acres. The absolute storage rights for the reservoir are shown below: NAME ADJUDICATION DATE APPROPRIATION DATE ADMINISTRATION NUMBER PM1JII1" Jackson Gulch Res. Jackson Gulch Res. 03-22-1963 12,31-1991 10-31-1936 12-31-1954 31715.00000 51499.38350 9.980 AF 1.385 AF 9