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<br />I. <br />I. <br />I. <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3769 <br /> <br />Colorado Soil Conservation Board - Agriculture Water Quality <br />Management for Colorado <br /> <br />The Colorado State Soil Conservation Board has identified <br />Mancos valley as one of seven critical agricultural water quality <br />areas in the state. This assessment is the result of <br />incorporating existing information with data obtained by the <br />Board from a water quality monitoring program conducted over a <br />three year period. <br /> <br />Based on data collected during the 1981 water year, <br />approximately 20,000 tons of salt were added to the river system <br />as it passed through 8,600 acres of irrigated land in the Mancos <br />Valley. The valley encompasses 123,500 acres in the Mancos River <br />drainage above the ute Mountain ute Indian Reservation. Salt <br />loading within the area accounted for close to 50% of the total <br />salt load in the Mancos River at the Colorado-New Mexico state <br />line. <br /> <br />A segmental analysis revealed that 75% of the salt load <br />increase occurred in the Mud Creek and Weber Canyon drainages. <br /> <br />BuRec - McElmo Creek unit, Status Report, July 1981 <br /> <br />The McElmo Creek Unit investigation, described in this <br />report, attempts to determine the most cost-effective way to <br />reduce the 115,000 tons of salt entering the San Juan River <br />annually from the McElmo Creek drainage. Although they don't <br />attempt to attribute a specified amount of the McElmo Creek total <br />salt yield to irrigated agriculture, they expect to decrease the <br />salt yield by 57,000 tons annually by combining two ditches and <br />lining 34 miles of canal with concrete. <br /> <br />-37- <br />