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annual depletions of streamflow made in 1957 for the "Financial and Economic Analysis" of the Colorado River Storage Project, which were published in 1958 as Senate Document No. 101, 85th Congress, 2d Session, and upon the February 1960 Colorado River Storage Project operation studies. Glen Canyon Reservoir, the principal storage feature of the Colorado River Storage Project, will provide cyclic regulation of the flows of the Colorado River and assure delivery of water to the Lower Basin in compliance with the Colorado River Compact, which apportions the waters of the Colorado River system between the Upper and Lower Basins. Based upon the recurrence of Colorado River flow corresponding to the 1906-1959 period after making appropriate deductions for future water uses within the Upper Colorado River Basin, it is estimated that power releases from the Bridge Canyon Powerplant would produce an average of 5,706,000,000 kilowatt-hours of energy each year. After supply transmission losses, 1,350,000 kilowatts of capacity and 5,250,000,000 kilowatt-hours of energy would be available for supplying commercial loads and pumping requirements of the Pacific Southwest Water Plan. Under normal operation, the reservoir would fluctuate between elevations 1866 and 1862. Operation of the powerplant would be fully integrated with both Glen Canyon and Marble Canyon hydraulically and electrically to provide optimum daily and seasonal operation. Access--The potential damsite access highway from its junction with U.S. Highway 66, at a point 3.6 miles west of Peach Springs, to the damsite, would be a two-lane surfaced road with a total 20Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,379,008 byte