Teton Dam Disaster

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“The Teton Dam was an earthen dam on the Teton River in Idaho, United States. It suffered a catastrophic failure on June 5, 1976. Study of the dam’s environment and structure placed blame for the collapse on the permeable loess soil used in the core and on fissured (cracked) rhyolite in the abutments of the dam that allowed water to seep around and through the earth fill dam. The permeable loess was found to be cracked. It is postulated that the combination of these flaws allowed water to seep through the dam and led to internal erosion, called piping, that eventually caused the dam’s collapse” – Wikipedia 😉

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