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Rapidan Dam
Blue Earth River Rapidan.jpg
Blue Earth River below Rapidan Dam
Country United States
Location Blue Earth County, Minnesota
Coordinates 44°05′34″N 94°06′31″W / 44.092727°N 94.108662°W / 44.092727; -94.108662Coordinates: 44°05′34″N 94°06′31″W / 44.092727°N 94.108662°W / 44.092727; -94.108662
Purpose Power
Status Operational
Construction began 1908; 113 years ago (1908)
Opening date 1910; 111 years ago (1910)
Owner(s) Blue Earth County Government
Dam and spillways
Type of dam Concrete Gravity
Impounds Blue Earth River
Height 87 ft (27 m)
Length 475 ft (145 m)
Spillways 5 steel tainter gaits and 2 timber gates
Creates Rapidan Lake
Catchment area 2,430 sq mi (6,300 km2)
Surface area 318 acres (129 ha)

The Rapidan Dam is a concrete gravity dam located on the Blue Earth River in Rapidan Township, near Rapidan, Minnesota in the United States. The dam was constructed for Hydroelectric Power Generation from 1908 to 1910. The dam and reservoir are owned by Blue Earth County, and the power plant and dam are operated by North American Hydro under an agreement with the county. The dam is located just southwest of Mankato, Minnesota.

Blue Earth County operates the Rapidan Dam Park & Campground on the west embankment of the dam for camping, hiking, river access, and recreational activities.

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