What was the worst disaster ever caused by a dam failure in the United States?
The worst disaster caused by a dam failure in the United States occurred in the Spring 1889 in Johnstown, Pennsylvania. After a night of heavy rain, the South Fork Dam broke, sending 20 million tons of water and debris down a narrow valley and onto Johnstown. The flood left over 2,200 dead and many more homeless. For more information on the Johnstown flood, you can visit the Johnstown, Pennsylvania homepage at .
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