These Are the 5 Most Devastating Floods to Sweep Through the U.S. in the Last 100 Years

These Are the 5 Most Devastating Floods to Sweep Through the U.S. in the Last 100 Years

Black Hills floodDate: June 9–10, 1972Location: Rapid City, South DakotaThis 1972 weather event is the biggest flood to hit the U.S. in the last 100 years. In the eastern Black Hills of South Dakota near Rapid City, a stationary group of thunderstorms began around 5 p.m. on June 9, 1972, and produced record rainfall. Roughly two hours later, a flash-flood warning was issued for the area. According to the U.S. Geological Survey (USGS), nearly 15 …