What was the largest dam failure disaster in US history?

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.



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Banqiao Dam Failure (China, 1975) The Banqiao Dam failure is considered the deadliest dam disaster in history. Heavy rainfall caused the dam to collapse, leading to a catastrophic flood. The estimated death toll ranges from 26,000 to 171,000, with millions of people affected.

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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. The St.

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More than 450 people were killed in the March 1928 St. Francis Dam collapse, a civil engineering failure that unleashed an avalanche of water across Southern California.

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In 1975 the failure of the Banqiao Reservoir Dam and other dams in Henan Province, China caused more casualties than any other dam failure in history. The disaster killed an estimated 171,000 people and 11 million people lost their homes.

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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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Yet about 1,000 dams have failed over the past four decades, killing 34 people, according to Stanford University's National Performance of Dams Program. Built for flood control, irrigation, water supply, hydropower, recreation or industrial waste storage, the nation's dams are over a half-century old on average.

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Kariba Dam, Zimbabwe Kariba Dam is the world's biggest dam based on water storage capacity. Located at the former Kariwa (Kariba) Gorge, the dam creates Lake Kariba, which has a storage capacity of 185 billion cubic metres of water and a surface area of 5,580km2.

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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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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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Downriver towns and major cities would see the most damage, in the event of the dam's physical collapse. Water flows would engulf many towns and growing cities around Mohave county, including Laughlin, Nevada; Needles, California; Lake Havasu, Arizona; and even as far south as Yuma, Arizona, and San Luis Rey, Colorado.

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Hoover Dam is the most famous dam in the US. It was constructed during the Great Depression, beginning in 1931, and was completed in 1936.

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5 Dams in the U.S. that Hold the Most Water
  • Hoover Dam (Nevada/Arizona): 8.95 cubic miles.
  • Glen Canyon Dam (Arizona): 8.53 cubic miles.
  • Garrison Dam (North Dakota): 7.05 cubic miles.
  • Oahe Dam (South Dakota): 6.98 cubic miles.
  • Fort Peck Dam (Montana): 5.52 cubic miles.


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If the dam could not hold back an excessive amount of water, the water would come over the top of the dam and potentially flood areas downstream, including cities.

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1879-Reilly sold the dam to Benjamin Ruff, who bought it in the name of the South Fork Fishing and Hunting Club of Pittsburgh. The Club inadequately patched the holes from the 1862 break; never replaced the sluice pipes; lowered the top of the dam to make it wider for carriages; and put fish screens over the spillway.

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The January 5, 2023 spillway failure of the North Fork Dam on Pacheco Creek is an unfortunate sign that California has much work to do to ensure dam safety. The North Fork Dam has been a focus of the California Department of Water Resources (DWR) Division of Safety of Dams (DSOD) since at least 2017.

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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.

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