Horse Mesa Dam

33°35′27″N 111°20′38″W / 33.59083°N 111.34389°W / 33.59083; -111.34389Construction began1924Opening date1927Owner(s)U.S. Bureau of ReclamationDam and spillwaysType of damConcrete thin archImpoundsSalt RiverHeight305 ft (93 m)Length660 ft (200 m)Width (crest)8 ft (2.4 m)Width (base)57 ft (17 m)Dam volume162,000 cu yd (124,000 m³)SpillwaysGated concrete tunnel and over-the-crestSpillway capacity150,000 cu ft/s (4,200 m³/s)ReservoirCreatesApache LakeTotal capacity245,138 acre⋅ft (0.302373 km³)Catchment area5,842 sq mi (15,130 km²)Surface area2,656 acres (1,075 ha)Normal elevation1,919 ft (585 m)Power StationTurbines3x 11²/₃MW units, 1x 97MW pumped-storage unitInstalled capacity129 MW

The Horse Mesa Dam is a concrete thin arch dam located in the Superstition Mountains, northeast of Phoenix in Maricopa County, Arizona.

The dam is 660 feet (200 m) long, 300 feet (91 m) high and was built between 1924 and 1927. The dam includes three conventional hydroelectric generating units totaling 32 megawatts (MW) and a pumped-storage unit with a capacity of 97 MW.

The dam and associated infrastructure were listed on the National Register of Historic Places in 2017.

A few homes are nearby for temporary employee housing. Its name is derived from when sheep-herders used to graze their saddle and pack animals on the mesa when they were driving their flocks through the area.^[1] It has an estimated elevation of 2,067 feet (630 m) above sea level.

Reservoir

The dam forms Apache Lake as it impounds the Salt River. The dam and reservoir are located downstream from the Theodore Roosevelt Dam, and upstream from the Mormon Flat Dam.

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