What was the biggest dam disaster in Italy?

On October 9, 1963, at 10:39 pm 260 million cubic meters of rock broke off from the top of Monte Toc, on the border between Veneto and Friuli Venezia Giulia. It fell into the reservoir of the Vajont Dam, producing an enormous wave of at least 50 million cubic meters of water.



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On 1st December 1923, the failure of the Gleno dam caused a huge disaster, which devastated the Scalve valley in the province of Bergamo in Lombardy (northern Italy).

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The Vajont Dam as seen from the village of Longarone in 2005, showing roughly the top 60–70 m (200–230 ft) of concrete. The wall of water that overtopped the dam by 250 m (820 ft) and destroyed this village and all nearby villages on 9 October 1963 would have obscured virtually all of the blue sky in this photo.

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And all that water was barreling into Lake Powell toward a choke point only a quarter of a mile wide. The only thing in its way was Glen Canyon Dam, which had only been completed 20 years before and had only been filled close to capacity once.

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A wave of water washed above the lake to Casso and Erto, communities above the reservoir, where the air blast and water destroyed buildings and caused at least 158 fatalities. Five downstream towns were destroyed including Longarone, Pirago, Rivalta, Villanova, and Fae.

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The Derna dam collapses were the catastrophic failures of two dams in Derna, Libya on the night of 10–11 September 2023, in the aftermath of Storm Daniel.

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Located in the Central Asian nation of Tajikistan, the Usoi Dam is a feat of natural engineering. The dam's story reminds us of nature's astonishing power. At a whopping 1,860 feet (567 meters) tall, the Usoi Dam is by far the tallest in the world—more than two and a half times as high as the better-known Hoover Dam.

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Francis Dam disaster, catastrophic dam failure in California on March 12, 1928, that was one of the worst civil engineering failures in American history. The ensuing flood killed hundreds and swept away thousands of acres of fertile land.

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Three minutes before midnight on March 12, 1928, the St. Francis Dam collapsed, sending over 12 billion gallons of water and debris rushing down the Santa Clara River Valley from San Francisquito Canyon to the Pacific Ocean, 54 miles away. In six hours more than 450 people were swept away in the dark and murky waters.

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