Dimensions
Owyhee is 833 feet (254 m) long at the crest, which is 30 feet (9.1 m) wide. The base of the dam is 265 feet (81 m) wide, with a height of 417 feet (127 m). The crest elevation sits at 2,675 feet (815 m) above sea level and has a hydraulic height of 325 feet (99 m). Total concrete used in this arch gravity style dam was 537,500 cubic yards (410,900 m3).
The dam’s spillway can allow 41,790 cubic feet (1,183 m3) per second of water flow, while its tunnel capacity is 1,100 cubic feet (31 m3) per second. The outlet works can allow up to 2,530 cubic feet (72 m3) per second. If full, the reservoir would hold 1,183,300 acre feet (1.4596×109 m3) of water, and is 53 miles (85 km) long. The total drainage area of the dam and reservoir is 10,900 square miles (28,000 km2) in Eastern Oregon and western Idaho.
Owyhee Dam was the tallest dam in the world until the Lac du Chambon dam was built in France in 1934 at 136.7 meters (448 feet).
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