Transportation officials in Ontario believe that 40 bolts securing the deck to beams on one span of the two-span new Nipigon River Bridge, 60 miles from Thunder Bay, Canada, failed under uplift forces from the bridge cables, which pulled the deck up several feet. That opened a breach in the roadway that halted traffic on the heavily used Trans-Canada Highway.
No injuries were reported and the deck has since been loaded with highway dividers to close the gap.