Heavy rains overwhelmed the South Fork Dam, owned by an exclusive fishing club whose wealthy members included Andrew Carnegie and Henry Frick. The resulting wall of water and debris obliterated the industrial town of Johnstown, killing over 2,200 people in one of America's deadliest disasters and spurring the young Clara Barton's American Red Cross into its first major relief operation.
Residents downstream had complained for years about the dam's neglected condition, but the South Fork Fishing and Hunting Club, whose roster read like a who's-who of Gilded Age industrialists, had lowered the dam's height to widen a road and installed fish screens that likely clogged spillways. On the afternoon of May 31, after days of torrential rain, the earthen dam gave way entirely.
A wall of water 40 feet high, carrying trees, houses, and rail cars, roared down the valley at speeds up to 40 miles per hour. It struck Johnstown with such force that debris piled up against a stone railroad bridge, then caught fire, trapping and burning victims already fighting for their lives in the wreckage.
Clara Barton arrived five days later with a small team and stayed for five months, distributing supplies and building shelters, work that established the Red Cross as a permanent national institution. Despite the scale of negligence, no club member was ever held legally liable, a fact that fueled early American debates over corporate responsibility.