Castle Creek (South Dakota)
It rises out of Deerfield Reservoir, in the Black Hills in Pennington County approximately 15 mi (24 km) NNW of Custer. It flows north and east, joining Rapid Creek approximately 4 mi (6.4 km) west of Silver City.
Castle Creek received its name on account of castle-like rock formations of the nearby canyon.
- U.S. Geological Survey Geographic Names Information System: Castle Creek (South Dakota)
- Federal Writers' Project (1940). South Dakota place-names, v.3. University of South Dakota. p. 19.
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