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Horse Mesa Dam

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Located on the Salt River 65 miles northeast of Phoenix, Horse Mesa Dam is a concrete thin-arch structure 305 feet high. Constructed by the Salt River Valley Water Users' Association between 1924-1927, the dam contains 162,000 cubic yards of concrete, and forms a 245,138 acre-foot reservoir.

The spillway, as modified in 1936-1937 by the Bureau of Reclamation, includes a 50,000 cubic foot per second, concrete-lined auxiliary tunnel, 30 feet in diameter and 400 feet long; a regulating gate, gatehouse, and operating mechanism for controlling the tunnel; and a concrete discharge apron below the existing spillway. The piers on the radial-gate spillways were thickened, individual motor-driven gate hoists were installed, and two 15-kilovolt-ampere gasoline-engine driven generators were installed for emergency operation of the hoist motors.

Last updated: Jun 29, 2009