Skagit River Bridge ~ SURVEILLANCE Video: Washington Bridge Collapses Caused by Truck Crash - May 23, 2013

SURVEILLANCE Video: Washington Bridge Collapses Caused by Truck Crash - May 23, 2013


MOUNT VERNON, Washington (Reuters) - A bridge that collapsed in Washington state and sent two cars plunging into the Skagit River, raising concerns about the safety of the nation's aging infrastructure, was knocked down by a truck that crashed into at least one girder, officials said on Friday.

The truck, after the accident, rumbled across the bridge safely before a portion of the structure gave way, sending a car and pick-up into the frigid river on Thursday evening, along with a mass of concrete and steel. Three people were rescued.

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While no one was killed, the collapse of the steel truss bridge built in 1955 prompted renewed calls from lawmakers in Washington, D.C. and elsewhere for greater investment in the nation's aging infrastructure.

But Washington state officials said preliminary indications were that the bridge, which was inspected twice last year, was not structurally deficient and fell because of the impact from the truck striking its support beams.

"We had a collision between a very heavy vehicle traveling at probably not a small amount of speed crashing into not just one but probably multiple girders, and it failed," Governor Jay Inslee told an afternoon press conference in Mount Vernon.

Officials say the bridge, 55 miles north of Seattle, was not among the spans listed by the state as "structurally deficient," which in some cases relates to bridges that cannot carry their intended traffic loads.

But the privately run National Bridge Inventory Database listed the bridge as "functionally obsolete," widely defined by public officials as not built to current standards and demands.

"Based on our inspecting, the bridge is not structurally defective," said Lynn Peterson, state secretary of transportation. "We do take hits on almost every one of our bridges. This is just bad luck where and how it was hit."

KEY ARTERY

She said there were a number of bridges along Interstate 5 in Washington state rated lower than the bridge that collapsed.

A new bridge that suffered a similar blow would have likely reacted the same way, Washington State Department of Transportation spokeswoman Jan Katzenberger said.

U.S. National Transportation Safety Board investigators were on the scene of the collapse, which occurred on the four-lane Interstate 5, the principal highway between Seattle and Vancouver, Canada.

The NTSB said its members would inspect the 1,111-foot (339-meter) Warren Truss bridge, which links Mount Vernon and Burlington, including its substructure, deck and superstructure. Underwater inspections would also be conducted, the agency said.

David Goldberg, a spokesman for the nonprofit policy group Transportation for America, said that the bridge's status as "functionally obsolete" did not necessarily mean that it needed to be replaced but that it might not accommodate modern needs.

"A lot of these older bridges are carrying much more traffic, and heavier traffic, than was envisioned when they were built," Goldberg said.

"There is no redundancy built in for the key structural elements. So if something happens - being struck by a vehicle or watercraft, a slight tremor, or vibrations from the traffic - it could set off a chain reaction that brings it down," he said.

The truck driver, identified as 41-year-old William Scott, made it across the bridge and pulled his vehicle to the side of the road after the accident. He has not been arrested and was cooperating with authorities.

Truckers must obtain a permit from the state Department of Transportation to carry an oversize load. The driver also receives a proposed route from the state, Washington State Patrol spokesman Sergeant Kirk Rudeen said.