<P> The I - 35W Mississippi River bridge ( officially known as Bridge 9340 ) was an eight - lane , steel truss arch bridge that carried Interstate 35W across the Saint Anthony Falls of the Mississippi River in Minneapolis , Minnesota , United States . It had a catastrophic failure during the evening rush hour on August 1 , 2007 , killing 13 people and injuring 145 . The bridge opened in 1967 and was Minnesota 's third busiest , carrying 140,000 vehicles daily . The NTSB cited a design flaw as the likely cause of the collapse , noting that a too - thin gusset plate ripped along a line of rivets , and additional weight on the bridge at the time contributed to the catastrophic failure . </P>
<P> The I - 35W Mississippi River bridge ( officially known as Bridge 9340 ) was an eight - lane , steel truss arch bridge that carried Interstate 35W across the Saint Anthony Falls of the Mississippi River in Minneapolis , Minnesota , United States . It had a catastrophic failure during the evening rush hour on August 1 , 2007 , killing 13 people and injuring 145 . The bridge opened in 1967 and was Minnesota 's third busiest , carrying 140,000 vehicles daily . The NTSB cited a design flaw as the likely cause of the collapse , noting that a too - thin gusset plate ripped along a line of rivets , and additional weight on the bridge at the time contributed to the catastrophic failure . </P>
when did the i-35 bridge collapse in minneapolis
when did the i-35 bridge collapse in minneapolis
August 1 , 2007
August 1 , 2007