Opened 1949 | ||
 | ||
Similar Pinto Dam, Toutle River Sediment, Dry Falls Dam, Moses Lake, North Dam | ||
O'Sullivan Dam (National ID # WA00268), one of the largest earthfill dams in the United States (200 ft/61 m high; 19,000 ft/5,791 m long; completed 1949), is on Crab Creek in the U.S. state of Washington, about 45 km south of Ephrata and 25 km south of Moses Lake.
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Map of O'Sullivan Dam, Othello, WA 99344, USA
The 27,800-acre (113 km2) Potholes Reservoir formed by this dam collects return flows from all irrigation in the upper portion of the project for reuse in the southern portion. A system of wasteways has been built on both the West and East Low Canals to provide operational safety for the canals and a means of delivering water into Potholes Reservoir to supplement the natural and return flows.[1]
The dam was built as part of the Columbia Basin Project.
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References
O'Sullivan Dam Wikipedia(Text) CC BY-SA