Remembering the Johnstown Flood – May 31, 1889
It seems like May 31st is a cursed weather date here in Pennsylvania with tornado outbreaks and dam breaks!
136 years ago today, one of the deadliest natural disasters in U.S. history struck Pennsylvania. On May 31, 1889, the South Fork Dam collapsed after days of relentless rain, unleashing 20 million tons of water from Lake Conemaugh into the Conemaugh Valley—and straight into the heart of Johnstown.
In a matter of minutes, a wall of water 35 feet high raced downstream at speeds of up to 40 miles per hour, destroying everything in its path—homes, bridges, trains, factories, and entire neighborhoods. Over 2,200 people lost their lives, including entire families, and more than 700 were never identified.
The Johnstown Flood was not just a tragedy—it was also a turning point in American history. It prompted a nationwide outpouring of aid and led to major changes in dam safety regulations and emergency response planning. The American Red Cross, under Clara Barton, responded to its first major disaster here.