Horse Mesa Dam Country United States Location Tonto National Forest, Maricopa County, Arizona Coordinates 33°35′27″N 111°20′38″W / 33.59083°N 111.34389°W Coordinates: 33°35′27″N 111°20′38″W / 33.59083°N 111.34389°W Construction began 1924 Opening date 1927 Owner(s) U.S. Bureau of Reclamation Dam and spillways Type of dam Concrete thin arch Impounds Salt River 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 m 3) Spillways Gated concrete tunnel and over-the-crest Spillway capacity 150,000 cu ft/s (4,200 m 3/s) Reservoir Creates Apache Lake Total capacity 245,138 acre⋅ft (0.302373 km 3) Catchment area 5,842 sq mi (15,130 km 2) Surface area 2,656 acres (1,075 ha) Normal elevation 1,919 ft (585 m) Power Station Turbines 3x 11 2/ 3MW units, 1x 97MW pumped-storage unit Installed capacity 129 MW
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 1924-27. 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.
Reservoir [ edit ]
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.
Downstream view of Horse Mesa Dam.
Water flowing out of a spillway at Horse Mesa, circa 1940
External links [ edit ]