Coolidge Dam, 249 ft (76 m) high, 920 ft (280 m) long, on the Gila River, SE Ariz.; built 1927–28. It irrigates c.100,000 acres (40,470 hectares), half of which are Native American lands in San Carlos Reservation. San Carlos Reservoir, formed behind the dam, lies above old tribal burial grounds and the former camp of Geronimo.
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