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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The St. Francis Dam, created by the Los Angeles County Water and Power company as part of the California aqueduct system, collapsed at 11:58 pm on March 12, 1928, making it the was the worst manmade disaster in California history.
The worst dam failure in the United States was the Johnstown flood of 1889. The failure of the South Fork Dam, which affected Johnstown, is currently regarded as the worst dam failure in U.S. history.
— Nearly 180,000 people were evacuated from Oroville five years ago following a potential Oroville Dam disaster that threatened to flood the town and the surrounding communities.
The failure of the South Fork Dam, which affected Johnstown, is currently regarded as the worst dam failure in U.S. history. About eight miles to the east of Johnstown, Pennsylvania, was where the South Fork Dam, a rock and earthen dam, was built.
Together these factors have made Mosul Dam the most dangerous dam in the world, because there are almost certainly an unprecedented level of untreated voids in the dam's foundation.
The largest hydroelectric plant in the United States is at Grand Coulee Dam. Its three powerplants have a capacity of 6,809 MW, and it generates, on average, about 21 billion KWh, while Hoover Dam's powerplant has a capacity of 2,074 MW and generates approximately 4 billion KWh a year.
Cities like Las Vegas, Boulder City, and Scottsdale would have severely limited water, affecting the lives of millions of people. The fountains in Las Vegas would dry up. People would be scrambling to have water to flush their toilets.
While the dam is expected to last for centuries, engineers predict the structure could last for more than 10,000 years, surpassing most remnants of human civilization if humans were to disappear from the earth. However, they also predict the dam's turbines without human intervention would shut down within two years.