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Upper Basin Reservoirs Fontenelle The reservoir water level will be lowered through the fall and winter months until a water surface elevation of about 6,480 feet is reached. With average runoff during the spring months, Fonten- elle Reservoir will fill by the end of June, After the spring runoff, the reservoir level will be controlled by adjusting the releases through the powerplant to slowly reduce the elevation to 6,504 feet by the end of the summer of 1977 (Chart 1,) Flaming Gorge At the beginning of water year 1977, the active storage in Flaming Gorge Reservoir was 3,474,000 acre-feet, with a water surface at elevation 6,033 feet. The reservoir level will be lowered about 10 feet by March of the current year, but should re- main high enough until the spring runoff so boats can be launched from all of the nine boat ramps. Average inflow would cause the reservoir to reach elevation 6,033 feet with an active storage of 3,470,000 acre-feel. Summertime flow in the river below the dam should not exceed 4,500 ft"/s and would not be less than 800 f1"/s. Releases should average about 140,000 acre-feet per month through September 1977 for a water year total of about 1,675,000 acre-feet. (Chart 2,) Curecanti Unit During the current year, the water level in Slue Mesa Reservoir should reach a low in March 1977 at elevation 7,457 feet and the active storage would be 355,000 acre-feet, With average inflow during the spring of 1977, the reservoir should fill at elevation 7,519 feet with an active storage of 830,000 acre-feet. AI that elevation the reservoir has a surface area of 9,180 acres and a reservoir length of 24 miles, (Charts 3 and 4.) Morrow Point Reservoir will be operated near full during the current year. Releases of a minimum flow of 200 f1"/s will be made below the Gunnison Tunnel Diversion Dam for downstream irrigation requirements, power production, and river regu- lation. Sail boating on Lake Mead, backed up by Hoover Dam. 30 Navajo Reservoir On September 30, 1976, Navajo Reservoir had an active storage of 1,284,000 acre-feet with water surface elevation at 6,055 feet. During October through March, releases will be controlled to lower the reservoir elevation to 6,040 feet prior to spring runoff. At elevation 6,040 feet, Navajo Reservoir will have an extra 150,000 acre-feet of storage in anticipation of the water release for the Navajo Indian Irrigation Project. Average inflow would cause the reservoir to reach elevation 6,066 feet, with an active storage of 1,420,000 acre-feel. The reservoir will be maintained at or near this level throughout the remainder of the summer to en- hance recreation use, (Chart 5,) Glen Canyon-Lake Powell For the current year, the level of Lake Powell should drop about 4 feet during the fall and winter months to elevation 3,659 feet. The active storage would be 19,0 million acre-feet. Assuming an aver- age April-July 1977 runoff, the resulting inflow of about 8,0 million acre-feel should caUse the lake to reach an all-time high elevation of 3,676 feet during July, with an active storage of 21,3 million acre-feet, or approximately 85 percent of the ac- tive capacity of the reservoir, The lake woutd have a length of 185 miles and a water surface area of 144,810 acres, Assuming average conditions dur- ing water year 1977, a total release of 9.2 million acre-feet is scheduled from Lake Powell to satisfy storage requirements for Lake Mead and lake Powell, in compliance with section 602 of Public Law 90-537, The scheduled release will pass through the turbines to generate power for cus- tomers in the Colorado River Basin States, (Chart 6,)