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<br />l- <br />I. <br />l- <br />I- <br />l- <br />I- <br />l- <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 />\ <br /> <br />3761 <br /> <br />DOLORES SUBBASIN <br /> <br />The Dolores River Basin is located in southwestern Colorado <br />and east central Utah. Its boundary encompasses an area of <br />approximatley 4,645 square miles, 4,092 square miles of which are <br />in Colorado. The basin is bounden on the south and west by the <br />San Juan Mountains and the Uncompahgre Plateau. Elevations range <br />from 4,100 to more than 14,000 feet above sea level. <br /> <br />Approximately 2 percent of the land in the basin is used for <br />crop production. The remaining 98 percent is used for grazing, <br />lumber production, mining, wildlife, and other purposes. The <br />major use of water in the basin is for the irrigation of 47,000 <br />acres. In 1980, the population of this area was 15,500. <br /> <br />USGS - Professional Paper 441 <br /> <br />For water years 1914-57, the USGS reported the average <br />annual sal t yield for the Dolores River at Cisco, Utah to be <br />approximately 460,000 tons. All but an insignificant portion of <br />the total salt load at this station (No. 0918000) originates on <br />lands within Colorado. <br /> <br />Approximately 112,000 tons of salt per year were attributed <br />to the irrigation of 47,000 acres of agricultural land within the <br />basin. An additional 1,000 tons per year were attributed to <br />municipal and industrial use of water making the total salt yield <br />attributable to the activities of man about 113,000 tons per <br />y.ear. <br /> <br />-29- <br />