In Washington work has started on the Grand Coulee project on the Columbia River, which will ultimately cost $400,000,000 and include a 500-foot main storage dam with a reservoir 150 miles in length extending to the Canadian boundary, a power plant of 2,520,000-horsepower installed capacity, two auxiliary dams, pumping plants and irrigation works for 1,200,000 acres. An economic investigation is now being made of the project, which will include compiling topographic and land ownership maps and land classification.
The Central Valley project in California, to cost $170,000,000, provides for the development by conservation of the water re sources of the Sacramento and San Joaquin rivers for the benefit of lands having an insufficient supply. Its principal construction features are the Kennett storage dam, reservoir and power plant on the Sacramento River; the Keswick dam, reservoir and power plant ; Kennett power transmission line and substation ; Contra Costa conduit ; Sacramento-San Joaquin delta cross-channel; Friant dam, reservoir and power plant on the San Joaquin River; Madera and Friant-Kern canals and the San Joaquin pumping system.
The Casper-Alcova project in Wyoming will provide irrigation works for 35,000 acres near Casper with the 232-foot Alcova di version dam and 265-foot Seminoe storage dam as two of the im portant construction features. Power to be developed at Seminoe will serve the principal cities in central and southern Wyoming and exert an important influence in mining and transforming into commercial products the extensive mineral deposits in central Wyoming.
In southwestern Arizona, the Bureau has undertaken construc tion of a 150,000-acre unit of the Gila Valley irrigation project with diversion from the Colorado River at the Imperial Dam. The Owyhee irrigation project in Oregon includes the 405-foot Owyhee storage dam completed in 1932. Irrigation works for 120,000 acres will be completed in 1936. On the Yakima project in Washington the Roza division of 72,00o acres is under con struction; also the Heart Mountain division of 35,000 acres on the Shoshone project in Wyoming, and the Payette division of 47,00o acres on the Boise project in Idaho. In Utah the bureau has five projects under way, all of which will provide supple mental water for lands now under irrigation. They are the Hyrum,
Ogden River, Provo River, Sanpete and Moon Lake projects.
In 1935 two storage dams, the Hyrum on the Little Bear River in Utah, and the Agency Valley on the North Fork of Malheur River in Oregon were completed. Work is in progress on eleven dams—Grand Coulee dam on the Columbia Basin project in Wash ington, Taylor Park on the Uncompahgre project in Colorado, Rye Patch on the Humboldt project in Nevada, Moon Lake on the Moon Lake project in Utah, Pine View on the Ogden River project in Utah, Unity on the Burnt River project in Oregon, Bull Lake on the Riverton project in Wyoming, Seminoe and Alcova dams on the Casper-Alcova project in Wyoming, Imperial on the All-Amer ican Canal project in Arizona-California, and the Parker dam on the Colorado River being constructed by the Bureau for the Metro politan Water District.
Funds are also available for beginning construction of the Alamogordo dam on the Pecos River in New Mexico, Deer Creek on the Provo River project in Utah, Fresno on the Milk River in Montana, Bartlett on the Verde River in Arizona, Wikiup on the Deschutes River in Oregon, Kennett and Friant dams on the Cen tral Valley project in California, Boca on the Little Truckee River in California, and for completion of the Hamilton dam and building other dams for flood control and irrigation on the Colo rado River in Texas. Investigations to determine the engineering and economic feasibility of proposed projects and the rehabilita tion of existing projects are in progress in several states.