What Caused The Johnstown Flood Of 1889?
What Caused The Johnstown Flood Of 1889? The South Fork Dam in Pennsylvania collapses on May 31, 1889, causing the Johnstown Flood, killing more than 2,200 people. Johnstown is 60 miles east of Pittsburgh in a valley near the Allegheny, Little Conemaugh and Stony Creek Rivers. … As the canal system fell into disuse, maintenance