3. St. Francis Dam Failure Concrete gravity arch dam near Los Angeles, CA Failed on March 12, 1928 Resulted in the death of more than 450 people Cause: It was built on a fault line in a weak geological area unable to support the dam
5. Big Dig Ceiling Collapse July 10, 2006 A concrete ceiling panel weighing 3 tons fell in the Fort Point Channel Tunnel in Boston The panel fell on a car, killing the passenger and injuring the driver Cause: The bolts used were too short and the epoxy used was not up to standards
7. I-35 Bridge Collapse Minneapolis, Minnesota over the Mississippi River Collapsed on August 1, 2007 during the evening rush hour Resulted in the death of 13 people and injured 145 Cause: Undersized gusset plates and increased deadweight due to construction error
9. New orleans levee Failures August 29, 2005 after Hurricane Katrina 28 failures reported in the first 24 hours and over 50 in the following days 85% of New Orleans was flooded Cause: Overtopping of levees, undermining of flood wall foundations, and soil giving way.
11. Charles de gaulle roof collapse May 23, 2004 at Charles De Gaulle Airport in Paris, France A portion of Terminal 2E’s ceiling collapsed Resulted in the death of 4 people Cause: The concrete vaulted ceilings were pierced by metallic pillars and the design had little margin for error to reduce costs
13. Tropicana Parking Garage collapse October 30, 2003 at the Tropicana Casino in Atlantic City 4 construction workers were killed and 21 others were injured Cause: The concrete floors were not allowed to cure properly before temporary supports were removed and additional floors built
15. Tacoma Narrows Bridge Collapse November 7, 1940 in Washington State Cause: Aeroelastic flutter caused by 42 mph winds. The wind matched the resonance frequency of the bridge causing the main span to collapse.
17. Big Blue crane collapse July 14, 1999 Occurred during the construction of Miller Park in Milwaukee 3 people were killed as a result One of the most serious heavylift crane accidents Cause: The effect of side winds was not calculated for the 450 ton load
19. Sunshine Skyway bridge disaster May 9, 1980 The southbound span of the original bridge was destroyed Resulted in the death of 35 people Cause: The freighter MV Summit Venture collided with a support column sending 1200 feet of bridge into Tampa Bay
21. Seongsu Bridge Collapse October 21, 1994 32 people died and 17 injured A concrete slab fell from the bridge when the suspension structure failed Cause: Improper welding of the steel trusses of the suspension structure beneath the roadway
