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I-35W Mississippi River bridge
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<p>The I-35W Mississippi River bridge (officially known as Bridge 9340) was an eight-lane, steel <a href="/facts/Truss_arch_bridge/9n58cmeC">truss arch bridge</a> that carried <a href="/facts/Interstate_35W_(Minnesota)/n9SQWJC8">Interstate 35W</a> across the <a href="/facts/Mississippi_River/RduarPzj">Mississippi River</a> one-half mile (875 m) downstream from the <a href="/facts/Saint_Anthony_Falls/cSagDIDA">Saint Anthony Falls</a> in <a href="/facts/Minneapolis/gEsXsP3d">Minneapolis</a>, <a href="/facts/Minnesota/ncgVuC4Q">Minnesota</a>, United States. The bridge opened in 1967, and was Minnesota's third busiest, carrying 140,000 vehicles daily. After only 39 years in service, it experienced a <a href="/facts/Catastrophic_failure/X5NDNv9r">catastrophic failure</a> during the evening <a href="/facts/Rush_hour/c2mG9cPQ">rush hour</a> on August 1, 2007, killing 13 people and injuring 145. The <a href="/facts/National_Transportation_Safety_Board/02dgBoCz">National Transportation Safety Board</a> (NTSB) cited a design flaw as the likely cause of the collapse, noting that an excessively thin <a href="/facts/Gusset_plate/zxDzCB9w">gusset plate</a> ripped along a line of rivets. Additional weight on the bridge at the time of failure was also cited by the NTSB as a contributing factor. </p><p>Help came immediately from <a href="/facts/Mutual_aid/cj0HJI5J">mutual aid</a> in the seven-county <a href="/facts/Minneapolis%E2%80%93Saint_Paul/jMN3SqzK">Minneapolis–Saint Paul</a> metropolitan area and emergency response personnel, charities, and volunteers. Within a few days of the collapse, the <a href="/facts/Minnesota_Department_of_Transportation/F1uLwxaD">Minnesota Department of Transportation</a> (MnDOT) planned its replacement with the <a href="/facts/I-35W_Saint_Anthony_Falls_Bridge/EPg5qrbG">I-35W Saint Anthony Falls Bridge</a>. The construction of the replacement bridge was completed quickly, and the new bridge officially opened on September 18, 2008. </p>