The dam was 305' (93m) high.
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| 19:22 video @ 12:34 The Wild Story of the Teton Dam Failure The Bureau of Reclamation decided to fill the reservoir even though construction of the primary outlet works would not be done for another year. They did have a secondary outlet works available, but it was not enough to keep the fill rate under a foot (30cm) a day. (But, "after a particularly snow winter," it filled at 2 feet a day.) The dam was built on porous rock and the wind-deposited silt (loess) they used in the cutoff trench supported piping. That is, the water was able to erode a pipe through the trench. |
The dam collapsed on Jue 5, 1976, during its first filling. So this year (2026) is the 50th anniversary of the collapse. That explains why I saw several videos about the collapse. The above video makes the following videos rather redundant, but I could not bring myself to delete them.
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| @ 12:59 |
This is the beginning of a sequence of stills that show how this little gurgle quickly grew into a massive breach.
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| 12:30 video @ 2:15 The 1976 Collapse of the Teton Dam, Idaho: Investigating the Geologic Evidence |
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