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<br />I <br />I <br />I <br />I <br />I <br />I <br />, <br />I <br />I <br />I <br />I <br />I <br />t <br />I <br />, <br />& <br />, <br />I <br />, <br />I <br />I <br />I <br /> <br />003260 <br /> <br />liJANCOS DIVISION <br /> <br />Location and Description <br /> <br />The Mancos Division consists of the drainage basin of the Mancos <br /> <br />River. The river heads on the western slope of the LaPlata Mountains in <br /> <br /> <br />Montezuma County and joins the San Juan in New Mexico three miles below <br /> <br /> <br />the Colorado-New Mexico State line. Watershed peaks extend to elevations of <br /> <br />13,000 feet. <br /> <br />River runoff all originates in Colorado and its use is in Colorado. <br /> <br /> <br />Below the State line the river is a losing stream. Stream runoff regula- <br /> <br /> <br />tion is provided by four reservoirs with a total storage capacity of <br /> <br /> <br />11,681 acre feet. The Jackson Gulch Reservoir, the largest of the four, <br /> <br /> <br />with a capacity of 9,750 acre feet, was constructed by the Bureau of <br /> <br /> <br />Reclamation and placed in operation in 1950. The other reservoirs have <br /> <br /> <br />a combined capacity of 1,931 acre feet. The irrigated lands of the basin <br /> <br /> <br />vary in elevations from 6,000 to 7,200 feet. <br /> <br />Data on the annual runoff of the river upstream from irrigation is <br /> <br />given in the following Table XXII. <br />TABLE XXII <br /> <br /> Runoff in Runoff in Runoff in <br />Year 1000 Acre Feet Year 1000 Acre Feet Year 1000 Acre Feet <br />1942 67.4 1948 37.4 1954 24.5 <br />1943 45.5 1949 47.7 1955 26.0 <br />1944 57.1 1950 25.1 1956 25.0 <br />1945 40.4 1951 15.7 <br />1946 22.6 1952 56.4 15-yr. 1942-56 Av. 36.5 <br />1947 34.2 1953 23.2 4-yr. 1953-56 Av. 24.7 <br /> <br />-34- <br /> <br />" <br />