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Principal Features The principal features to be constructed consist of Bridge Canyon Dam and Powerplant, the transmission system facilities, Coconino Dam and Reservoir and required access and operation facilities. The Bridge Canyon designed dam is a conventional, variable radius, concrete-arch dam 736 feet high above foundation, with a crest length of approximately 1,650 feet. The created reservoir would have a capacity of 3,710,000 acre-feet at normal water surface elevation of 1866. Of this capacity, 2,490,000 acre-feet would be conservation, 730,000 acre-feet inactive, and 490,000 acre-feet dead storage. The design and cost estimates of the powerplant are based on the concept of an underground plant located in a hall excavated in the left canyon wall downstream of the dam. The installed capacity of the powerplant is 1,500,000 kw., comprised of six 250,000-kw. generators. The transmission system would consist of transmission lines constructed from Bridge Canyon Powerplant to the load centers in the power market area and to other Bureau of Reclamation powerplants in the area. Switching stations and substations would be provided as required for the delivery of power and energy to the load centers of commercial power users and water project pumping plants. Plan of Operation The powerplant will utilize the Glen Canyon Reservoir cyclic regulation of the Colorado River flows to produce power and energy for commercial sale. Coordinated with the seasonal releases from 3Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,514,176 byte