United States Bureau of Reclamation
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Wikipedia[1], the ASDSO Dam Safety[4] journal abstract and the ASDSO dam-failure case study all state that Teton Dam failed on 5 June 1976, with the breach at about 11:55 a.m. per the case study.Idaho's new Teton Dam breached around midday on 5 June 1976 as its reservoir filled for the first time, releasing the entire lake, flooding five counties and killing 11 people.
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