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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.
The Potholes Reservoir is part of the Columbia Basin Irrigation Project. It is formed by the O'Sullivan Dam and located in central Washington, in the United States. The reservoir is fed by water from Moses Lake, part of the Crab Creek basin.The area features several lakes (typically 30-70 yards wide and 10â30 feet deep). These lakes, known as potholes were created through both natural and man made processes.n the shore of the reservoir is Potholes State Park, a 640-acre (2.6 km 2) member of the Washington State Park System. It has 600 feet (180 m) of shoreline on the reservoir.