01 Teton Dam

The Dam in Idaho , US , cost $ 100 million to build , but more than three times that number in insurance payouts after disaster struck on June 5 , 1976 , during its first filling .

The dam ’ s downstream face developed a wet spot which rapidly discharged water , washing out embankment material until the crest collapsed , releasing massive amounts of water .

Farmland and nearby towns were flooded , leading to 14 deaths , and huge damage to over 2,000