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r I 4221. . through September, and 3 ft3/s for the reIllainder of the year will be maintained. The native flow of Lake Creek as measured at the gage 1.9 miles upstream from Twin Lakes Reservoir has averaged 86,200 acre-feet annually. The flows have ranged from a winter average of about 20 ft3/s to a June average of 550 ft3/s. The Twin Lakes Reservoir and Canal Company's transmountain diversions from the Roaring Fork River have averaged 36,000 acre-feet, but have been increased somewhat in recent years by rehabilitation of the system. These transmountain diversions have been regulated in the 54,400 acre-feet of active storage in Twin Lakes, which is also operated by the Twin Lakes Reservoir and Canal Company. Releases from the reservoir have been zero in those times the storage right has been operative. Seepage from the Twin Lakes Dam, however, maintained a minimum flow of about 7 ft3/s in Lake Creek as measured in the discharge channel below the dam. The native flow of Clear Creek as measured at the gage 0.5 mile upstream from Clear Creek Reservoir has averaged 49.500 acre-feet annually. The flows have ranged from a winter aver- age of 11 ft3/s to an average June flow of 305 ft3/s. Three 1972 flow measurements of Clear Creek between the dam and the Arkansas River averaged 43 ft3/s. The Pueblo Board of Water Works has owned Clear Creek Reservoir since 1954 when it was purchased from the Otero Canal Company. Pueblo stores native Clear Creek water and transmountain diversion by exchange in Clear Creek Reservoir which has a capacity of 11,440 acre-feet. . The historic average annual flow of the Arkansas River at 1'"","10 is about 51),UUU acre-feet. Eighty percent of this occurs during the April-October irrigation season. The low flows of the Arkansas River at Pueblo normally occur during the months of February and March. However, the lowest recorded flow occurred on April 7, 1935, and amounted to 18 ft3/s. Floods in the Arkansas River Basin usually occur in the summer and are the result of high intensity rainstorms. The flood of June 3, 1921, which resulted in a peak flow of 103,000 ft3/s at Pueblo, was most destructive to the downtown section of Pueblo (see Figure 111-13). This flood was caused by two cells of intense rainfall. One cell was located over the Eight Mile and Beaver Creek drainages and a lower cell was centered over the north and south bank tributary drainages between Swallows and Pueblo. Weather Bureau records indicate that for the 24 hours ending June 4, 1921, the rainfall in the drainage basin between Pueblo and Canon City was from 3 to 5 inches. III-33 .