The Night Rapid Creek Killed Two Hundred Thirty-Eight

On the night of June ninth, nineteen seventy-two, a nearly stationary thunderstorm parked itself over the eastern slopes of the Black Hills and began dropping rain at a rate that had no modern precedent. In six hours, fifteen inches of rain fell on the Rapid Creek watershed. The hillsides, already saturated from weeks of wet weather, could absorb nothing more.

Rapid Creek, which runs directly through the heart of Rapid City, rose thirty-eight feet in a matter of hours. The flood crest reached downtown around midnight. Neighborhoods built in the creek's natural floodplain, many of them modest homes occupied by working-class families, simply disappeared. Cars were found in trees. Houses were carried intact for blocks before being destroyed. The Sioux Park and Canyon Lake areas were hardest hit.

Two hundred thirty-eight people died that night, making it the deadliest flood in South Dakota history and one of the deadliest natural disasters in twentieth-century United States history. More than twelve hundred homes were destroyed. Nearly three thousand more were damaged. The economic loss in nineteen seventy-two dollars exceeded one hundred sixty million.

The city's response reshaped Rapid City more profoundly than any political decision in its history. Rather than rebuild the floodplain, city leaders made a decision almost without parallel in American urban planning at the time: they chose not to. The Rapid Creek corridor, once lined with homes, was converted to greenway. Today the Founders Park and Floodplain Trail system runs for miles where neighborhoods once stood, a living memorial that also happens to be functional flood protection.

The disaster is still present in the memory of older residents. Community organizations mark the anniversary every June ninth. The greenway trail is the most visible legacy, but the subtler one is a generation of civic leaders who decided that building back in harm's way was not an option, even when conventional wisdom and short-term economics pushed the other direction.