page_title: O'Sullivan Dam
hierarchical_section_title: O'Sullivan Dam
context_page_description: O'Sullivan Dam, one of the largest earthfill dams in the United States, 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 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.
context_section_description: 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.
caption: O'Sullivan Dam located near the bottom of Potholes Reservoir.
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