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<br />. <br /> <br />. <br /> <br />. <br /> <br />1 r> {"., <br />;Ju .J <br /> <br />I NTROOUCTI ON <br /> <br />The primary purpose of the Narrows Unit Is to provide supplemental <br />Irrigation water to about 166,370 acres of land, Narrows Reservoir <br />also would serve the purposes of flood control, fish and wildlife, <br />recreation, and Incidental water quality Improvement. <br /> <br />Narrows Reservoir would be located In Weld and Horgan Counties, <br />Colorado, about 7 miles west of Fort Horgan, Lands to be Irrigated <br />by the project lie along both sides of the South Platte River In <br />Colorado, generally between Narrows Dam and the Colorado-Nebraska <br />State line, In parts of Horgan, Washington, Logan, and Sedgwick <br />Counties. Plate I of the memorandum report preceding this sub- <br />stantiating report depicts the project area. <br /> <br />DESCRIPTION OF THE AREA <br /> <br />The South Platte River-drains northeastern Colorado, southeastern <br />Wyoming, and southwestern Nebraska. Its drainage basin Is roughly <br />rectangular In shape, with an elongation at the northeast corner. The <br />total drainage area Is 24,300 square miles. 13,450 of which are above <br />the proposed Narrows Reservoir site In Colorado. <br /> <br />The South Platte River rises northwest of Falrplay, Colorado, along <br />the eastern slopes-of the Continental Divide. It flows south and <br />then east across the broad South Park Valley and through Eleven-Hlle <br />Canyon. Near Lake George, Colorado, the river runs northward through <br />40 miles of mountainous country until It emerges from the foothills <br />about 15 miles south of Denver. It then continues generally north- <br />ward to the vicinity of Greeley, where It turns and follows an <br />irregular east and northeast course to Its confluence with the North <br />Platte River at North Platte, Nebraska. Total length of the South <br />Platte River Is about 442 miles. <br /> <br />Near Its source, the average gradient of the South Platte River Is <br />more than 1,000 feet per mile. The gradient decreases to about 20 <br />feet per mile through South Park, t~en Increases to about 68 feet <br />per mile In the South Platte Canyon, Across the plains, the average <br />gradient varies from 15 feet per mile just downstream from Denver to <br />8 feet per mile In the lower reaches. <br /> <br />The principal tributaries which Join the South Platte River from the <br />west, In downstream order, are Tarryall Creek, North Fork of the <br />