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Reservoirs During water year 1975, the Upper Colorado River Basin yielded 13,700,000 acre-feet, or 116 percent of the long-time average. The disposition of this runoff was as follows: Acre-Feet Net Reservoir Storage Increase Evaporation Loss Bank Storage Increase. Release to Lower Basin. 2,770,000 630,000 1,020,000 9,280,000 13,700,000 Total 8 Operations Water storage at Glen Canyon increased by 2,190,000 acre-feet from October 1974 to September 1975. Flaming Gorge gained 70,000 acre-feet, and Navajo and Blue Mesa gained 390,000 and 120,000 acre-feet, respectively. In the spring, Fontenelle and Morrow Point were again filled to capacity. Flaming Gorge Reservoir filled on July 28, 1975, with a content of 3,750,000 acre-feet and a surface elevation of 6,040 feet. Lake Powell's record high water surface elevation occurred on July 25, 1975, when active storage reached 21,177,000 acre-feet at elevation 3,675 feet. Rivers Releases from Glen Canyon Dam were scheduled to integrate with available springtime surplus hydroelectric power from the Missouri River Basin. The resulting pattern of infiow to Lake Mead and scheduled Lake Mead water demands caused the level of the lake to recede about 1 foot during the bass-spawning season. Indications are that a fairly constant lake level and other conditions resulted in an average bass spawn. For construction purposes. springtime releases from Blue Mesa were adjusted so that, when added to the side inflow downstream, there was a flow of less than 4,000 fP/s past the Crystal Dam site. Flows below Fontenelle, Flaming Gorge, Blue Mesa, and Morrow Point were regulated to meet irrigation and power demands. ] Flaming Gorge Dam.