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South Dakota Farmers Union Communications Director, Chuck Groth, Cooperative Legacy Project interview with Harlan Severson, rural electric pioneer and author of Stepping Forward Boldly, The 25th Anniversary History of East River Electric Power Cooperative published in 1975.

Senators Karl Mundt, George McGovern, Representative Ben Reifel, and Secretary of the Interior Stewart Udall by a model of a gasification facility for Rapid City, South Dakota

South Dakota Farmers Union Communications Director, Chuck Groth, Cooperative Legacy Project interview with Leroy Schecher, former Grand Electric Cooperative manager, 2007 South Dakota Association of Cooperative Hall of Fame inductee.

Representatives Ben Reifel and E.Y. Berry by a model of a gasification facility for Rapid City, South Dakota

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Photographer documenting the flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Workers clearing debris from the flood in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Young girl holding a puppy and sitting in the driveway of a home damaged by the flood in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Man looking at the flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Body recovered after the flood in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972. The flood resulted in 238 deaths and 3,057 injuries.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Young girl holding a puppy and sitting in the driveway of a home damaged by the flood in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Photographer documenting the flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

Flood damage in Rapid City, South Dakota following 15 inches of rain over a small area in the Black Hills caused Rapid Creek and other waterways to overflow on June 9, 1972.

South Dakota Farmers Union Communications Director, Chuck Groth, Cooperative Legacy Project interview with Donald Paulson, former general manager of Golden West Telephone Cooperative and 2003 South Dakota Association of Cooperative Hall of Fame inductee.

South Dakota Farmers Union Communications Director, Chuck Groth, Cooperative Legacy Project interview with Robert Martin, former East River Electric Power Cooperative staff member and Rushmore Electric Cooperative general manager.