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<br />. <br /> <br />. <br /> <br />. <br /> <br />i...... '" -l .-:-. <br />~.1.i..') <br /> <br />3 <br /> <br />9.4 percent since 1950. The population of Fort Morgan, located <br />about 7 mi les southeast of the Narrows Dam site, was 7,379 in 1960. <br />Greeley, about 50 miles west of the damsite, had a population of <br />26,314. The Denver metropolitan area, about 75 miles southwest, <br />had a population of about one million. <br /> <br />PLAN OF DEVELOPMENT <br /> <br />The plan of development provides for a dam across the South Platte <br />River about 7 miles northwest of Fort Morgan. Supplemental irri- <br />gation would be suppl ied to about 166.370 acres of land by means of <br />existing privately developed river diversions and distribution <br />systems. <br /> <br />The Bureau of Reclamation proposes to acquire 26,930 acres of land <br />in fee title. Flood easements would be taken on an additional 2,000 <br />acres of land. <br /> <br />Narrows Dam would be a rolled earthfi 11 embankment with a maximum <br />height of 146 feet above streambed. The crest length of the dam at <br />elevation 4,453 feet would be 22,120 feet. The width of the crest <br />would be 30 feet. At the top of the flood control pool, elevation <br />4,428.5 feet, the reservoir would have a surface area of 25,245 <br />acres and a total capacity of 973,185 acre-feet of storage. Of this <br />capacity, 475,000 acre-feet are allocated to flood control, 75,000 <br />acre-feet to joint-use by flood control and irrigation, 373,025 acre- <br />feet to irrigation, and 50,160 acre-feet to inactive and dead storage. <br />The reservoir would provide 575,373 acre-feet of surcharge from the <br />top of the flood control pool to maximum water surface elevation <br />4,447 feet. <br /> <br />The spillway would be an uncontrolled type with a capacity of 27,600 <br />second-feet at maximum water surface elevation of 4,447 feet. The <br />spillway crest, set at elevation 4,428.5 feet, would be 100 feet <br />long and have a weir height of 43.5 feet. Spills over the weir would <br />be carried to the still ing basin below the dam in a lOO-foot wide <br />open concrete chute. <br /> <br />The river outlet would be near the left abutment of the dam and to <br />the right of the spillway. During periods of flooding, the outlet <br />works would have capacity to discharge 8,600 second-feet, with the <br />reservoir at the maximum elevation of 4,447 feet, and would be used <br />along with the spi Ilway to protect the dam. During periods of normal <br /> <br />Revised 12/12/66 <br />