Dam Failure Case Study: Teton Dam (Idaho, 1976)

DamFailures.Org is an ASDSO project that provides individual dam failure case studies and lessons learned as a resource for dam safety engineers, dam operators, owners, regulators, managers, academia and students to help prevent future incidents.

Teton Dam was located in southeastern Idaho about 15 miles from Rexburg in the valley of the Teton River. The dam and its reservoir were the principal elements of the Teton Basin Project designed by the Bureau of Reclamation to control flooding as well as provide a source of hydropower, irrigation, and drinking water. Construction on the Teton Dam, reservoir, and powerhouse began in 1972 and by November 1975 the zoned earthfill embankment was essentially complete with a structural height of 305 feet and a crest length of 3,100 feet. Less than one year later, the dam experienced catastrophic failure on June 5, 1976 during its first filling. Failure of the Teton Dam and subsequent draining of the reservoir caused the deaths of 11 people and approximately $400 million in damages.