The costliest and deadliest flash flood in American history

The History Guy remembers the 1972 Black Hills Flood of South Dakota or Rapid City Flood, the United States of America's costliest and deadliest flash flood in South Dakota.
The History Guy uses images that are in the Public Domain. As photographs of actual events are often not available, I will sometimes use photographs of similar events or objects for illustration.
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The episode is intended for educational purposes. All events are presented in historical context.
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