All three people who fell into the Skagit River in northwestern Washington state escaped with only minor injuries.
The four-lane Interstate 5 bridge collapsed about halfway between Seattle and Vancouver, British Columbia, after an oversize truck hit the span, the Washington State Patrol chief said.
Officials are trying to find out whether the spectacular collapse of a bridge on one of the West's most important roadways was a fluke or a sign of a bigger problem with thousands of bridges across the US.
"You cannot overstate the importance of this corridor to Washington state," Gov. Jay Inslee said. Traffic on I-5 and surrounding roads was backed up for miles, a situation the governor said would continue indefinitely.
Officials were looking for a temporary, pre-fabricated bridge to replace the 50-meter section that failed, Inslee said yesterday. If one is found, it could be in place in weeks. If not, it could be months before a replacement can be built, the governor said.
"He looked in the mirrors and it just dropped out of sight," Cynthia Scott, the trucker's wife, said from the couple's home in Canada.
"I spoke to him seconds after it happened. He was just horrified."
The truck driver works for Mullen Trucking in Alberta, the Washington State Patrol said. The tractor-trailer was hauling the equipment southbound when the top right front corner of the load struck several of the bridge's trusses, the patrol said.
Scott has been driving truck for 20 years and hauling specialised loads for more than 10.
Initially, it wasn't clear if the bridge just gave way on its own. But Washington State Patrol Chief John Batiste blamed it on the too-tall load. The vertical clearance from the roadway to the beam is 4.45 meters.
