O'Sullivan Dam

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O'Sullivan Dam located near the bottom of Potholes Reservoir. Osulivan.jpg
O'Sullivan Dam located near the bottom of Potholes Reservoir.

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.


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.

The dam was built as part of the Columbia Basin Project.


See also

Coordinates: 46°58′57″N119°17′28″W / 46.98250°N 119.29111°W / 46.98250; -119.29111

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