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", . . ". c, ~ ~ '! ~ U ;J uses. Pueblo ~nam and Reservoir, tbe terminal storage-facility, will be located on the Arkansas River about 6 miles west of the city of Pueblo at approximately the same site as the existing Barrier Dam. The reservoir will include 93,000 acre-feet of storage allocated to flood control, The Corps of Engineers will have the responsibility of prescribing regulations for the use of the flood control storage, as specified under Section 7 of the 1944 Flood Control Act, About one-third of the Arkansas River Ilasin above Las Animas Iii! I be con- trolled by. the Pueblo Dam; hO\iever, storms occurring over the large uncontrolled drainage area below the dam could produce major floods at Pueblo and points downstream to John ~Iartin Dam. '. " 14. A local protection project to protect Las Animas from Arkansas River floods lias authorized by the 1965 Flood Control Act. The plan consists of 9.6 miles of levee on the right bank and one mile of levee On the left bank. Appurtenant works include levee protective measures; an interior drainage system consisting of outlet structures, a ditch, and ponding areas; a sewage pumping plant; and intake structures for irrigation canals. o -- ,- I~ HYDROLOGIC D!:T/I IS. DI/AIf',1GE BASIN FEATURES, - The Arkansas River originates in central Colorado. It flows in a southerly direction for about 60 miles to above Solido;, Colo., and thence eastward to John ~lartin Dam. The total contributing drainage area abc'le Pueblo damsite is 4,670 square mi 1es. From the source to Salida, the Arkansas River traverses a val] ey bounded by high mountains \dth peaks ranging up to 14,000 feet above mean sea level. In this reach, flows arc p,oduced by small perennial streams which originate on the high peaks. The larger of these are Cottonwood Creek, which enters near Buena Vista, and the South Arkansas River which enters near Salida.___~ctw~e-I'_Sal.idL"nd~~Canon_Ci.ty,_the~ _ ___ ~ ------------rfvcrerlfers-ad~eep--narrowgorge. This gorge is about 55 miles long and contains the famnus Royal Gorge with vertical walls as high as 1,000 feet. There "-re four major tributaTies in this reach. They are Badger Creek, Texas Creek, Grape Creek, and Currant Creek. , 16. At Canon City the Arkansas River emerges from the gorge and flows through a narrow val ley to Pueblo. In this reach there are six major tributaries entering the river, Oil Creek, Beaver Creek, Turkey Creek, lIardscrabble Creek, Galbeth C.eek" and Dry Creek. From Pueblo to John ~Iartin Dam, the Arkansas River fiows through a broad valley superimposed on the plains to a \iidth of 5 miles in some locations. Within this reach 10 large tributaries enter the river. The South bank tributaries are St. Charles River" lluerfano River, Apishapa River, Timpas Creek, and Purgatoire River. The north hank tributaries are Fountain Creek, Chico Creek, Kramer Creek, Horse Creek, and Adobe Creek. The drainage area of the Arkansas River Basin above John ~lartin Dam is shown on plate I. 5