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.
when did the i-35 bridge collapse in minneapolis
August 1, 2007