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• <br />Region 1 extends from the headwaters of the North Platte River downstream <br />to Lewellen, Nebraska, above Lake McConaughy. The majority of Region 1 <br />is located in Wyoming. Region 1 is subdivided into eight reaches, including <br />Reaches 1 through 6, 12, and 13. <br />Region 2 extends from the headwaters of the South Platte River downstream <br />to Julesburg, Colorado. The majority of Region 2 is located in Colorado. <br />Region 2 is subdivided into 4 reaches, including Reaches 7, 8, 9, and 11. <br />Region 3 consists of the South Platte River from Julesburg, Colorado and the <br />North Platte River from Lewellen downstream to their confluence near North <br />Platte, Nebraska. Region 3 continues from the confluence of the North and <br />South Platte Rivers downstream to Grand Island, Nebraska. Region 3 is <br />subdivided into 7 Reaches, including Reaches 10 and 14 through 19. <br />Provided below are brief overviews of the existing water supply systems and <br />uses within each region. <br />0 Region 1 <br />North Platte River Basin Upstream of Lake McConaughy <br />Region 1 includes the North Platte River Basin above Lake McConaughy <br />with a drainage area of about 28,600 square miles. Elevations in Region 1 <br />range from 3,300 feet at Lake McConaughy to about 11,000 feet in the <br />headwaters area in Colorado. Annual precipitation in the region varies from <br />20 to 40 inches at the headwaters to 9 -16 inches in the lower reaches of the <br />North Platte River above Lake McConaughy. <br />Within this region, water collected and conveyed by the North Platte River <br />provides a source of supply to meet the needs of a variety of uses including <br />agricultural, municipal, industrial, domestic, commercial, recreational and <br />environmental. The Wyoming Water Planning Program (197 1) estimated <br />consumptive uses in the Platte River Basin in Wyoming for the year 2000 to <br />be 1.03 million acre -feet. Irrigation accounted for about 88.9 percent of this <br />consumptive use. Industrial use was the next largest user at 7.6 percent and <br />municipal, domestic, and stock water use followed at 3.5 percent. Current <br />information regarding present water uses are available from the data and <br />documentation associated with ongoing interstate litigation. <br />From a water budget perspective, the North Platte River Basin in Region 1 <br />encompasses both surface water and groundwater components. In addition to <br />the main stem of the North Platte River, surface water flows from several <br />major tributary streams including, but not limited to: <br />3 -3 <br />