Collapse of Teton Dam

Date: June 5, 1976 • Location: Saint Anthony, United States

The Teton Dam in eastern Idaho, U.S., collapsed (failure pictured) as its reservoir was being filled for the first time, resulting in the deaths of eleven people and 13,000 cattle, and causing up to $2 billion in damage.

The Teton Dam was an earthen dam in the western United States, on the Teton River in eastern Idaho. It was built by the U.S. Bureau of Reclamation, one of eight federal agencies authorized to construct dams. Located between Fremont and Madison counties, it suffered a catastrophic failure on June 5, 1976, as it was filling for the first time.