( CNN ) -- A new permanent span over Washington state 's Skagit River reopened Sunday , some four months after a bridge collapse on Interstate 5 . The bridge 's failure in late May sent cars tumbling into the river and severed the state 's main artery to Canada , on which trucks carry an estimated $ 13.9 billion annually in cargo . A temporary span went up within a few weeks . NTSB : 'Boom , ' then shudder , first sign of problem on bridge . Roughly 70,000 vehicles a day travel on Interstate 5 over the bridge , said the state Department of Transportation , which announced the reopening on its Facebook page . It posted a time-lapse video , showing crews working through the night to put the new span in place . Bearing down : How safe is that bridge you 're driving over ?
Temporary span went up within a few weeks of the collapse . Comment: