WSP01365 - Laserfiche WebLink

Home Browse Search

. 1,.." .- J,_ :, 3 9.4 percent since 1950. The population of Fort Morgan, located about 7 miles southeast of the Harrows Dam site, was 7,379 In 1960. Greeley, about 50 miles west of the damslte, had a population of 26,314. The Denver metropolitan area, about 75 miles southwest, had a populatIon of about one million, PLAN OF DEVELOPMENT The plan of development provides for a dam across the South Platte River about 7 miles northwest of Fort Horgan. Supplemental Irri- gation would be supplied to about 166,370 acres of land by means of existing privately developed river diversions and distribution systems. The Bureau of Reclamation proposes .to acquire In fee title all land to the top of the Joint use pool, blocked out to the next highest legal subdivision, comprIsing 23,040 acres. Flood easements would be taken on an additional 5,890 acres of land. . Narrows Dam would be a rolled .earthflll embankment wIth a maximum height of 146 feet above streambed. The crest length of the dam at elevation 4,453 feet would be 22,120 feet. The width of the crest would be 30 feet, At the top of the flood control pool, elevation 4,428.5 feet, the reservoir would have a surface area of 25,245 acres and a total capacIty of 973,185 acre-feet of storage. Of thIs capacity, 475,000 acre.feet are allocated to flood control, 75,000 acre-feet to Jolnt-use by flood control and Irrigation, 373,025 acre- feet to IrrigatIon, and 50,160 acre-feet to Inactive and dead storage. The reservoir would provide 575,373 acre-feet of surcharge from the top of the flood control pool to maximum water surface elevation 4,447 feet. The spillway would be an uncontrolled type with a capacity of 27,600 second-feet at maximum water surface elevation of 4,447 feet. The spillway crest, set at elevation 4,428.5 feet, would be 100 feet long and have a weir height of 43.5 feet. Spills over the weir would be carried to the stilling basin below the dam In a 100-foot wide open concrete chute. The river outlet would be near the left abutment of the dam and to the rIght of the spillway. DurIng perIods of floodIng, the outlet works would have capacity to dIscharge 8,600 second-feet, with the reservoir at the maximum elevation of 4,447 feet, and would be used along with the spillway to protect the dam. During periods of normal .