Dam Failure - List of Major Dam Failures

List of Major Dam Failures

Dam/incident Year Location Nb deaths Details
Marib Dam 575 Sheba, Yemen Unknown (possibly neglect)
Pantano de Puentes 1802 Lorca, Spain 608 1800 houses and 40000 trees destroyed
Dale Dike Reservoir 1864 South Yorkshire, England, United Kingdom Defective construction, small leak in wall grew until dam failed.
South Fork Dam 1889 Johnstown, Pennsylvania, United States Blamed locally on poor maintenance by owners; court deemed it an "Act of God". Followed exceptionally heavy rainfall. Caused Johnstown flood.
Walnut Grove Dam 1890 Wickenburg, Arizona Territory, United States Heavy snow and rain following public calls by the dam's chief engineer to strengthen the earthen structure.
McDonald Dam 1900 Texas, United States Extreme current caused failure.
Hauser Dam 1908 Helena, Montana, United States Heavy flooding coupled with poor foundation quality
Austin Dam 1911 Austin, Pennsylvania, United States Poor design, use of dynamite to remedy structural problems.
Desná Dam 1916 Desná, Austria-Hungary (now Czech Republic) 62 Construction flaws caused the dam failure
Lake Toxaway Dam 1916 Transylvania County, North Carolina 0 Heavy rains caused the dam to give way. Dam was later rebuilt in the 1960s
Sweetwater Dam 1916 San Diego County, California Over-topped from flooding
Lower Otay Dam 1916 San Diego County, California 40 Over-topped from flooding
Gleno Dam 1923 Province of Bergamo, Italy 356 Poor construction and design
Llyn Eigiau dam and the outflow also destroyed Coedty reservoir dam. 1925 Dolgarrog, North Wales, UK 10<16 Contractor blamed cost-cutting in construction but 25" of rain had fallen in preceding 5 days. This was the last dam failure to cause death in the UK to date (2010).
St. Francis Dam 1928 Valencia, California, Los Angeles County, United States 600 Geological instability of canyon wall that could not have been detected with available technology of the time, combined with human error that assessed developing cracks as "normal" for a dam of that type.
Nanty Gro Reservoir in Wales 1942 Nanty Gro Valley, Wales Destroyed during preparation for Operation Chastise in World War II.
Eder, Möhne Dams 1943 Eder Valley, Ruhr, Germany 47<100 Destroyed by bombing during Operation Chastise in World War II.
Vega de Tera 1959 Ribadelago, Spain 144 deaths
Malpasset 1959 Côte d'Azur, France 400 Geological fault possibly enhanced by explosives work during construction; initial geo-study was not thorough.
Baldwin Hills Reservoir 1963 Los Angeles, California, United States 3 Subsidence caused by over-exploitation of local oil field
Spaulding Pond Dam (Mohegan Park) 1963 Norwich, Connecticut, United States 6 more than $6 million estimated damages
Vajont Dam 1963 Italy Strictly not a dam failure, since the dam structure did not collapse and is still standing. Filling the reservoir caused geological failure in valley wall, leading to 110 km/h landslide into the lake; water escaped in a seiche over the top of dam. Valley had been incorrectly assessed stable.
Mina Plakalnitsa, (Vratsa) 1966 Vratsa, Bulgaria 500? A tailings dam at Plakalnitsa copper mine near the city of Vratsa failed. A total 450,000 cu m of mud and water inundated Vratsa and the nearby village of Zgorigrad, which suffered widespread damage. The official death toll is 107, but the unofficial estimate is around 500 killed.
Buffalo Creek Flood 1972 West Virginia, United States 125 Unstable loose constructed dam created by local coal mining company, collapsed in heavy rain
Canyon Lake Dam 1972 South Dakota, United States Flooding, dam outlets flooded with debris.
Banqiao and Shimantan Dams 1975 China 100,000 or more Extreme rainfall beyond the planned design capability of the dam. Worst dam failure.
Teton Dam 1976 Idaho, United States 11 Water leakage through earthen wall, leading to dam failure.
Laurel Run Dam 1977 Johnstown, Pennsylvania, United States Heavy rainfall and flooding that over-topped the dam.
Kelly Barnes Dam 1977 Georgia, United States 39 Unknown, possibly design error as dam was raised several times by owners to improve power generation.
Machchu-2 Dam 1979 Morbi, Gujarat, India 1,800<15,000 Heavy rain and flooding beyond spillway capacity.
Wadi Qattara Dam 1979 Benghazi, Libya Flooding beyond discharge and storage capacity damaged the main dam and destroyed the secondary dam in the scheme.
Lawn Lake Dam 1982 Rocky Mountain National Park, United States 3 Outlet pipe erosion; dam under-maintained due to location
Tous Dam 1982 Valencia, Spain
Val di Stava Dam collapse 1985 Italy Poor maintenance and low margin for error in design; outlet pipes failed leading to pressure on dam.
Upriver Dam 1986 Washington state, United States Lightning struck power system, turbines shut down. Water rose behind dam while trying to restart. Backup power systems failed, could not raise spillway gates in time. Dam overtopped(rebuilt).
Peruća Dam detonation 1993 Croatia Not strictly a dam failure as there was a detonation of pre-positioned explosives by retreating Serb Forces.
Saguenay Flood 1996 Quebec, Canada Problems started after two weeks of constant rain, which severely engorged soils, rivers and reservoirs. Post-flood enquiries discovered that the network of dikes and dams protecting the city was poorly maintained.
Meadow Pond Dam 1996 New Hampshire, United States Design and construction deficiencies resulted in failure in heavy icing conditions
Opuha Dam 1997 New Zealand Heavy rain during construction caused failure, dam was later completed
Aznalcollar Mine Tailings Dam / The Doñana disaster 25 April 1998 Spain Over-steepened dam failed by sliding on weak clay foundation, releasing 4–5 million cubic metres of acidic mine tailings into the River Agrio, a tributary of the River Guadiamar, which is the main water source for the Doñana National Park, a UNESCO World Heritage Site.
Vodní nádrž Soběnov 2002 Soběnov, Czech Republic Extreme rainfall during the 2002 European floods
Zeyzoun Dam 2002 Zeyzoun, Syria Failed 4 June 2002, killing 22 and affecting 10,000.
Ringdijk Groot-Mijdrecht 2003 Wilnis, Netherlands Peat dam became lighter than water during droughts and floated away
Hope Mills Dam 2003 North Carolina, United States Heavy rains caused earthen dam and bank to wash away
Big Bay Dam 2004 Mississippi, United States A small hole in the dam grew and eventually led to failure.
Camará Dam 2004 Brasil
Shakidor Dam 2005 Pakistan 70 Sudden and extreme flooding caused by abnormally severe rain
Taum Sauk reservoir 2005 Lesterville, Missouri, United States Computer/operator error; gauges intended to mark dam full were not respected; dam continued to fill. Minor leakages had also weakened the wall through piping.
Campos Novos Dam 2006 Campos Novos, Brazil Tunnel collapse
Gusau Dam 2006 Gusau, Nigeria Heavy flooding
Ka Loko Dam 2006 Kauai, Hawaii Heavy rain and flooding. Several possible specific factors to include poor maintenance, lack of inspection and illegal modifications.
Lake Delton 9 June 2008 Lake Delton, Wisconsin Failure due to June 2008 Midwest floods.
Koshi Barrage 2008 Kusha, Nepal Heavy rain
Algodões Dam 27 May 2009 Piau, Brazil Heavy rain
Situ Gintung Dam 2009 Tangerang, Indonesia Poor maintenance and heavy monsoon rain
Kyzyl-Agash Dam 2010 Kazakhstan Heavy rain and snowmelt
Hope Mills Dam 2010 North Carolina, United States Sinkhole caused dam failure
Delhi Dam July 24, 2010 Iowa, United States Heavy rain, flooding.
Niedow Dam August 7, 2010 Lower Silesian Voivodeship, Poland Heavy rain, over-topped from flooding
Ajka alumina plant accident October 4, 2010 Hungary 10 Failure of concrete impound wall on alumina plant tailings dam.
Kenmare Resources tailings dam October 8, 2010 Mozambique Failure of tailings dam at titanium mine.
Fujinuma Dam March 11, 2011 Japan Failed after 2011 Tōhoku earthquake.
Dam in Campos de Goytacazes, Brazil January 4, 2012 Rio de Janeiro State, Brazil Failed after a period of flooding.
Ivanovo Dam February 6, 2012 Biser, Bulgaria 8 Failed after a period of heavy snowmelt. A crack in the dam went un-repaired for years. Eight people killed and several communities flooded.
Köprü Dam February 24, 2012 Adana Province, Turkey 10 A gate in the diversion tunnel broke after a period of heavy rain during the reservoir's first filing. The accident killed ten workers.

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