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<br />. <br /> <br />fHH f'1O:7 <br />-" . '- .3d <br /> <br />. <br /> <br />Valley provide flows during summer and fall. The flows are highly variable, <br />sometimes exhibiting large fluctuations in a single day. No records are available <br />of Navajo Wash stream flows. <br /> <br />. <br /> <br />The Montezuma Valley hrigation Company also provides water for in'iga- <br /> <br /> <br />tion of about 3,800 acres of land west of Nan-aguinnep Reservoir in the Yellow <br /> <br /> <br />Jacket Creek watershed. No records are available of return flows and canal <br /> <br /> <br />spills that enter Yellow-Jacket Creek. The municipal water supplies for the <br /> <br /> <br />town of Cortez and some of the rural areas in the vicinity of Cortez are provided <br /> <br /> <br />by the Montezuma Valley hrigation Company from water diverted from the <br /> <br />Dolores River. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />An additional 3,000 acres is in'igated in McElmo Canyon, located along <br /> <br /> <br />McElmo Creek west of Cortez to the Colorado-Utah state line. The water <br /> <br /> <br />supply for these irrigated areas is provided primarily by return flows from irriga- <br /> <br /> <br />tion in the Montezuma Valley. Since salinity of the McElmo Creek return flows <br /> <br /> <br />is as high as 2,000 to 3,000 mg/l of total dissolved solids, a relatively high in'iga- <br /> <br /> <br />tion requirement of about five acre-feet per acre is required in the McElmo <br /> <br /> <br />Canyon area to provide adequate salt leaching capability. <br /> <br />. <br /> <br />. <br /> <br />The Dolores Project, developed by the Bureau of Reclamation in the early <br /> <br /> <br />1980's, 'provides supplemental irrigation water for delivery to the Montezuma <br /> <br /> <br />Valley from the Dolores River. Project deliveries to the Montezuma Valley <br /> <br /> <br />are anticipated to be 13,700 acre-feet per year for supplemental irrigation <br /> <br /> <br />of 26,300 acres, most of which is located in the McElmo Creek drainage basin. <br /> <br /> <br />Additional return flows from irrigation associated with the Project are estimated <br /> <br /> <br />to be 4,800 acre-feet per year, of which most will enter McElmo Creek. The <br /> <br /> <br />Dolores Project also includes the delivery of supplemental municipal supplies <br /> <br /> <br />to Cortez and Towaoc. Wastewater from municipal use will accrue to McElmo <br /> <br /> <br />Creek as water usage in Cortez increases. <br /> <br />. <br /> <br />. <br /> <br />Because of high salinity levels in McElmo Creek, investigations have been <br /> <br /> <br />made by the Bureau of Reclamation concerning construction of the McElmo <br /> <br />-10- <br /> <br />. <br /> <br />tE_, ,;"2 <br />