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<br />n~?'8~6 <br /> <br />WATER-LEVEL CHANGES 1964-71, NORTHERN <br />HIGH PLAINS OF COLORADO <br /> <br />By Warren E. Hofstra, John M. Klein, and Thomas J. Major <br /> <br />, <br /> <br />Ground-water withdrawals for irrigation increased from about <br /> <br />84,000 acre-feet to 430,000 acre-feet per year between 1960 and <br /> <br />1970 in the northern High Plains of Colorado, causing significant <br /> <br />water-level declines in areas where high-capacity wells are <br /> <br />concentrated. The number of wells increased from about 500 in <br /> <br /> <br />1960 to 2,560 in 1970. In 1968 the U.S. Geological Survey began <br /> <br /> <br />a study in cooperation with the Colorado Water Conservation Board; <br /> <br /> <br />the Colorado Division of Water Resources, Office of the State <br /> <br />Engineer; and the Management Districts of the northern High Plains <br /> <br />to provide information for administration and management of the <br /> <br />vital ground-water reserves of the northern High Plains. <br /> <br />The northern High Plains of Colorado is formed from an <br /> <br />erosional remanent of the Ogallala Formation of Pliocene Age that <br /> <br />extends from the South Platte River on the north to the Arkansas <br /> <br />River on the south, and from Limon, Colo. on the west across the <br /> <br />Colorado State line on the east (fig. I). This area includes all <br /> <br />1 <br />