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. During the evening
rush hour on August 1, 2007, it
suddenly collapsed, killing 13 people and injuring 145. The bridge was Minnesota's second 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 asserted that additional weight on the bridge at the time of the collapse contributed to the catastrophic failure.