USGS Fact Sheet 037-02: The 1972 Black Hills-Rapid City Flood Revisited
A peak flow of 31,200 ft 3 /s occurred at the gaging station above Canyon Lake (fig. 5) during the 1972 flood and was 12 times the previous maximum of 2,600 ft 3 /s recorded in 1952. The peak flow of 50,000 ft 3 /s at the gaging station at Rapid City duri...