The Arrowrock Project is located on the Boise River in southwest Idaho about 22 miles upstream of the City of Boise in Elmore and Ada Counties. It is part of the Columbia River network of dams.Arrowrock is part of the USBR “Boise Project” which includes five storage dams, two diversion dams, three power plants, 721 miles of canals, seven pumping stations, 1,323 miles of laterals, and 649 miles of drains. The Boise Project furnishes irrigation water to about 390,000 acres in southwestern Idaho and eastern Oregon.
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