Cottonwood Springs Dam is a dam in Fall River County, South Dakota in the southwestern part of the state, south of the Black Hills.

[2] It impounds Cottonwood Springs Creek for area flood control.

The reservoir it creates, Cottonwood Springs Lake, has a water surface of 36 acres (15 ha) and has a maximum capacity of 11,635 acre-feet (14,352,000 m3).

The dam and lake is approximately 6 miles (9.7 km) west of Hot Springs, South Dakota.

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