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<br />COLORADO WATER CONSERVATION BOARD <br />823 State Centennial Building <br />.1313 Sherman Street <br />Denver, Colorado 80203 <br /> <br />December 1980 <br /> <br />JACKSON GULCH DAM PROJECT <br /> <br />INTRODUCTION <br /> <br />The Jackson Gulch Dam project is located in the eastern part of <br /> <br />Montezuma County, in the southwest corner of Colorado. The area is <br /> <br />adjacent to the main Mancos River and extends downstream from the <br /> <br />confluence of the east middle and west tributaries for a distance of <br /> <br />about ten miles. The area lies at an average elevation of 7,000 feet. <br /> <br />The existing irrigation system was constructed by the farmers and <br /> <br />provides service for about 10,000 acres of land. <br /> <br />The proposed project will provide an inlet structure to Jackson <br /> <br />reservoir, and the structure will be designed to minimize the heavy <br /> <br />bedload of rock and gravel that is filling the inlet bench flume at <br /> <br />the present time. <br /> <br />PROBLEM <br /> <br />The inlet bench flume diverting water to the Jackson Gulch dam <br /> <br />was designed and built in 1949. However, at that time the engineers <br /> <br />felt that with the extreme cobble bed load experienced in the Mancos <br /> <br />River, it would be difficult to build a structure that would not need <br /> <br />continued maintenance by cleaning out the cobble. It was felt at the <br /> <br />time that a log and cobble dam would be easier to maintain and cheaper <br /> <br />to install. What has happened, however, is that heavy spring run-off, <br /> <br />on occasion, washes out the diversion structure and by the time the <br />