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Powell, city, Park county, northwestern Wyoming, U.S., on the Shoshone River. Founded as a ranching centre in the Powder River basin, a predominantly agricultural district, Powell was named in honour of the 19th-century explorer John Wesley Powell. It developed a substantial oil industry when reserves were discovered in the Bonanza field in 1888. Agriculture gained renewed prominence with the completion in the early 20th century of the Shoshone River Project, which provided irrigation for the...