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C') <,.". i,_,,_) '~;} D. Operation of Glen Canyon after reaching this point would be coordinated with Hoover Dam operations to produce the greatest amount of power and energy from these two hydro giants consistent , with filling the reservoirs. E. The filling criteria would apply until Glen Canyon is full, or 1987, whichever occurs first. Commissioner Dominy explained that 198'1 is the date when the present Hoover power contracts expire. The filling criteria also provide that in administration of Lake Mead for flood control purposes, recognition shall be given to available capacity in upstream reservoirs. It is anticipated that when the Upper Basin Storage system is in operation, flood control responsibilities may be divided between Hoover and Glen Canyon dams. This would reduce the water releases at the reservoirs, increase the efficiency of power operations by maintainir~ a higher water level, and reduce flood control space which is now necessary in Lake Mead. The Colorado River Storage Project was authorized by the Congress in 1956 to permit the Upper Basin States to utilize their share of Colorado River water and, at the same time, insure the fulfillment of downstream commitments. Glen Canyon Dam forms the last control point for delivery of water from the Upper to Lower Basin. Other storage units under way are the Navajo on the San Juan River in New Mexico, Flaming Gorge on the Green River in utah and wyoming, and Curecanti on the Gunnison River in Colorado. While the total storage at these other reservoirs is relatively small compared to Lake Powell, the filling criteria relate to the total project storage system. The present runoff prospects of the Colorado River for 1962 indicate that the storage in Lake Mead will be around 23 million acre-feet by the end of this calendar year. If present runoff prospects for the Colorado River materialize in 1962, the year-end situation at Lake Mead would be ideal in placing the filling criteria for Lake Powell into effect as soon as the progress of construction at Glen Canyon Dam makes such action advisable. The general principles and operating criteria for the filling period at Lake Powell are attached. x x x n ~~ r ....,..,r, 1''"'0 '}