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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 Addicks Reservoir spillway is located at, , and releases the remainder of Bear Creek just north of Buffalo Bayou. Addicks Reservoir and Dam get their name from the former town of Addicks, TX. Addicks Reservoir is formed by a rolled earthen dam 61,666 feet long and above the streambed.A 12-foot wide gravel road extends along the top of the dam. The top of the dam has a maximum elevation of 122.7 feet above the N.G.V.D.t is estimated the Addicks and Barker Reservoirs, along with other federal construction projects on Buffalo Bayou and its tributaries, will prevent average annual flood damages of $16,372,000 to the city of Houston.