16. I-35W Bridge Over the Mississippi River

Location: Minneapolis, MN

Year of Fail: 2007

An eight-lane steel truss arch bridge suddenly collapsed during a busy rush hour commute in 2007, killing 13 people and injuring 145. Built in 1967 and deemed "structurally deficient" by the federal government in both 1991 and 2005, the bridge was set to be replaced in 2020.  At the time of collapse, 575,000 extra pounds of construction material and equipment sat on the bridge, increasing the load placed on gusset plates that were already undersized. Approximately 100 vehicles were involved in the collapse, sending their occupants and 18 construction workers 115 feet down to the river or onto its bank.