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The dam is located approximately 4 miles (6 km) northeast of Orofino and impounds the Dworshak Reservoir for flood control and hydroelectricity generation. With a height of 717 feet (219 m), Dworshak is the third tallest dam in the United States and the tallest straight-axis concrete dam in the Western Hemisphere.he reservoir is required to maintain a minimum of 700,000 acre feet (0.86 km 3) of winter flood-storage space, and dam releases are operated so that water levels reach a maximum of 1,570 feet (480 m) in July.
Additionally, Wildhorse State Park and some private property surround the reservoir. Pertinent Information. At maximum capacity, the reservoir covers 2,830 acres, has a maximum depth of 70 feet, and an average depth of 40 feet. It has a coldwater, put-grow-take trout fishery and a self-sustaining warmwater fishery.