NTSB Cites Gussets and Loads in Collapse

Description:
After a 15-month probe, the National Transportation Safety Board has determined the probable cause of last year's fatal I-35W bridge collapse in Minneapolis was a design error that caused the failure of gusset plates on the 41-year-old 1,907-ft-long steel-deck truss bridge. They could not carry loads that included deck upgrades, construction materials, equipment and rush-hour traffic when it fell, killing 13 people and in­juring 145. The eight-lane bridge was a non-redundant fracture-critical structure.

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