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Ephrata, city, seat (1909) of Grant county, central Washington, U.S., near the south end of Grand Coulee Dam. Settled in 1882 by ranchers who raised horses, the community was named in 1892, probably for the biblical city. The surrounding farmland was developed by irrigation, first with water from wells, now with water from the Columbia Basin Irrigation Project. Wheat, alfalfa, and apples are the chief products. The area contains numerous lakes and is noted for...