Horse Mesa Dam
|Horse Mesa Dam|
|Location||Tonto National Forest, Maricopa County, Arizona|
|Owner(s)||U.S. Bureau of Reclamation|
|Dam and spillways|
|Type of dam||Concrete thin arch|
|Height||305 ft (93 m)|
|Length||660 ft (200 m)|
|Width (crest)||8 ft (2.4 m)|
|Width (base)||57 ft (17 m)|
|Dam volume||162,000 cu yd (124,000 m3)|
|Spillways||Gated concrete tunnel and over-the-crest|
|Spillway capacity||150,000 cu ft/s (4,200 m3/s)|
|Total capacity||245,138 acre⋅ft (0.302373 km3)|
|Catchment area||5,842 sq mi (15,130 km2)|
|Surface area||2,656 acres (1,075 ha)|
|Normal elevation||1,919 ft (585 m)|
|Turbines||3x 112/3MW units, 1x 97MW pumped-storage unit|
|Installed capacity||129 MW|
The dam is 660 feet (200 m) long, 300 feet (91 m) high and was built between 1924–27. 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. It has an estimated elevation of 2,067 feet (630 m) above sea level.
- SRP Horse Mesa Dam
- Historic American Engineering Record (HAER) No. AZ-15, "Horse Mesa Dam, Salt River, 65 miles East of Phoenix, Phoenix vicinity, Maricopa County, AZ"