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4. Summary of Reservoir Levels and Contents Runoff during the year ending September 30, 1978 ranged from a low of 59 percent of the 65-year (l914-1978) mean at the San Juan River station near Bluff, Utah, to a high of 104 percent of the 65- year mean at the Green River station at Green River, Utah. Runoff of the Colorado River near Cisco, Utah was 94 percent of the 65- year mean. Lake Powell's lowest elevation of the 1978 water year occurred on March 6, 1978. On September 30th the lake was at elevation 3,640 feet (live content 16,563,000 acre-feet). The lake was at its highest point on July 24, 1978 at elevation 3,652.75 'feet with a content of 18,143,000 acre-feet. A total of 8,214,000 acre-feet was released to the river below Glen Canyon Dam during the 1978 water year. The 1969-1978 (lO-year) delivery to the Lower Basin (measured at Lee Ferry) was 88,158,000 acre-feet. Lake Mead on September 30, 1978 contained 20,869,000 acre- feet* of available storage water at elevation 1,185.43 feet. Lake Mead held 7.3 million acre-feet in the 62.40 feet above its rated head. On September 30, 1978 the live storage of Lake Mead was 4,306,000 acre-feet more than the storage in Lake Powell. The results of the long-range reservoir operation procedures adopted by the Secretary of the Interior for Lake Powell, Flaming Gorge, Navajo, Bl~e Mesa, and Morrow Point reservoirs in the Upper Colorado River Basin and for Lake Mead in the Lower Basin are illustrated on the following pages for the 1978 water year. There was no equalization of storage in Lake Powell and Lake Mead during the year. "Based on April 1, 1967 Capacity Table revised according to Sedimentation Survey 1963-1964. 27