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Look up Johnstown PA.
Major issue where earthen dam gave way and took out the whole valley and towns downstream in 1889.
Somehow they built another earthen dam in the same spot that gave way in 1977 and created an even more devastating flood that channeled through a valley and picked up debris in one town to more effectively devastate the next one down the line.
Google Johnstown flood, this is not unique to Ohio.
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