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Kennewick, city, Benton county, southeastern Washington, U.S. It lies along the Columbia River, opposite Pasco and immediately southeast of Richland. Laid out in 1892 by the Northern Pacific Irrigation Company, Kennewick is surrounded by farm country producing alfalfa, corn (maize), beans, sugar beets, grapes, and cherries. Hydroelectric dams on the Columbia River and the Hanford Works of the U.S. Department of Energy just northwest of the tri-city group are important to the economy. Kennewick has...