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Originally published Sunday, May 26, 2013 at 1:36 PM

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Officials: Previous collisions on collapse bridge

The collapse of an interstate highway bridge in northern Washington state should be a wake-up call that prompts an expansive safety review, according to National Transportation Safety Board officials.

Associated Press

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SEATTLE —

The collapse of an interstate highway bridge in northern Washington state should be a wake-up call that prompts an expansive safety review, according to National Transportation Safety Board officials.

Investigators are trying to determine why a bridge over Interstate 5 about 60 miles north of Seattle collapsed after a truck clipped a steel truss and what can be done to prevent similar accidents. Officials have scheduled updates throughout the day Sunday.

NTSB Chairwoman Debbie Hersman on Saturday examined the scene in the Skagit River where two vehicles plunged into the water. Three people involved escaped with non-life threatening injuries.

An investigation by The Associated Press suggests similar accidents could happen elsewhere. Thousands of bridges around the U.S. are kept standing by engineering design, rather than sheer size or redundant protections. Such spans may be one freak accident or mistake away from collapse.

Bridge regulators call them "fracture critical" bridges, because if a single, vital component is compromised, they can crumple.

Hersman's team will spend about a week inspecting the I-5 bridge, talking to the truck driver whose vehicle hit it and examining maintenance documents and accident reports.

Other large vehicles struck the Skagit River bridge before the collapse Thursday, she noted. Investigators are using a high tech 3-D video camera to review the scene and attempt to pinpoint where the bridge failure began. Officials say they are working to find out whether the collapse was a fluke or a sign of bigger problems.

Hersman does not expect the investigation to delay removal of debris from the river or work on temporary replacement or repair plans. State and federal officials will work together on the investigation, she said.

They'll be watching for safety issues that could affect other bridges.

"The results can be very catastrophic," Hersman said. "We're very fortunate in this situation."

Washington state officials said Saturday that it will take time to find both short- and long-term fixes for the I-5 bridge.

While the NTSB finishes its inspection, state workers will begin cleaning up the river. Next, a temporary solution will be put in place to return traffic to Washington state's most important north-south roadway.

Motorists should not expect to drive on I-5 between Mount Vernon and Burlington for many weeks and possibly months, said Washington Transportation Department spokesman Bart Treece.

About 71,000 vehicles use that stretch of highway every day.

Officials were looking for a temporary, pre-fabricated bridge to replace the 160-foot section that failed, Gov. Jay Inslee said Friday. That option could be in place in weeks. Otherwise, it could be months before a replacement can be built, the governor said.

Inslee said it will cost $15 million to repair the bridge. The federal government has promised $1 million in emergency dollars and more money could come later, according to Washington's congressional delegation.

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Associated Press writer Donna Gordong Blankinship contributed to this report.

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