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 "For reasons unknown at this point in time, the semi struck the overhead of the bridge causing the collapse," Batiste told an overnight news conference.
The truck made it off the bridge and the driver remained at the scene and cooperated with investigators.
Two other vehicles went into the water Thursday evening as the structure crumbled. Three people were rescued and are recovering.
Drivers should expect delays at the break in the major north-south highway about 60 miles north of Seattle. Detours have been set up to try to ease the congestion.
Batiste urged drivers to avoid the area if possible, especially over the Memorial Day weekend.
Dan Sligh and his wife were in their pickup truck on Interstate 5 heading to a camping trip when a bridge before them disappeared in a "big puff of dust."
"I hit the brakes and we went off," Sligh told reporters from a hospital, adding he "saw the water approaching ... you hold on as tight as you can."
Sligh, his wife and another man in a different vehicle were dumped into the chilly waters of the Skagit River. They were injured, but miraculously, authorities said it appeared nobody was killed in the bridge failure that raised the question about the safety of aging spans and cut off the main route between Seattle and Canada.
"We don't think anyone else went into the water," said Marcus Deyerin, a spokesman for the Northwest Washington Incident Management Team. "At this point we're optimistic."
Sligh and his wife were taken to Skagit Valley Hospital with non-life-threatening injuries. The other man was reported in stable condition at United General Hospital in Sedro-Woolley, hospital CEO Greg Reed said.
Sligh said his shoulder was dislocated in the drop into the water, and he found himself "belly deep in water in the truck." He said he popped his shoulder back in and called out to his wife, who he described as being in shock initially as they waited for rescuers to arrive in boats.
Traffic along the heavily traveled route could be affected for some time.
"The I-5 corridor is totally disrupted," said Gov. Jay Inslee, who went to the scene Thursday night.
"Thanks to the rescuers and a little bit of luck, we had three Skagitonians who made it out of the Skagit River alive," Inslee said.
The bridge was inspected twice last year and repairs were made, Transportation Secretary Lynn Peterson said.
"It's an older bridge that needs a lot of work, just like a good number of bridges around the state," she said.
Transportation officials are working on plans for either a temporary or permanent replacement, she said.
The National Transportation Safety Board was sending an investigative team.
Trooper Francis said the portion of the four-lane bridge over the Skagit River collapsed about 7 p.m. Thursday.
Jeremiah Thomas, a volunteer firefighter, said he was driving nearby when he glimpsed something out of the corner of his eye and turned to look.
"The bridge just went down, it crashed through the water," he said. "It was really surreal."
The bridge was about 50 feet above the water. Deyerin said it appeared that two vehicles -- a car and the pickup with the travel trailer attached -- fell into the river. He said the water depth was about 15 feet, and the vehicles half-visible in the water likely were resting on portions of the collapsed bridge.
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 Crowds of people lined the river to watch the scene unfold.
"It's not something you see every day," said Jimmy O'Connor, the owner of two local pizza restaurants who was driving on another bridge parallel to the one that collapsed. "People were starting to crawl out of their cars."
He said he and his girlfriend were about 400 yards away on the Burlington Bridge when they heard "just a loud bang."
"Then we looked over and saw the bridge was down in the water," he said.
He pulled over and saw three vehicles in the water, including the camping trailer that landed upside-down, he said.
The bridge was not classified as structurally deficient, but a Federal Highway Administration database listed it as being "functionally obsolete" -- a category meaning that the design is outdated, such as having narrow shoulders and low clearance underneath.
The bridge was built in 1955 and has a sufficiency rating of 57.4 out of 100, according to federal records. That is well below the statewide average rating of 80, according to an Associated Press analysis of federal data, but 759 bridges in the state have a lower sufficiency score.
According to a 2012 Skagit County Public Works Department report, 42 of the county's 108 bridges are 50 years or older. The document says eight of the bridges are more than 70 years old and two are over 80.
Washington state was given a C in the American Society of Civil Engineers' 2013 infrastructure report card and a C- when it came to the state's bridges. The group said more than a quarter of Washington's 7,840 bridges are considered structurally deficient or functionally obsolete.
Democratic Rep. Judy Clibborn, who leads the transportation committee in the state House, said the bridge wasn't one that has been a focus for lawmakers.
"It is shocking that I-5 would have something happen like this," she said.
Clibborn said the collapse will call attention to the issues facing bridges -- especially the old bridge over the Columbia River that connects Vancouver and Portland, Ore.
Sligh said his wife was "doing OK" and that he had "lots of cuts."
"You're kind of pinching yourself and realize you're lucky to be alive."
[Associated
Press; By MANUEL VALDES and MIKE BAKER]
Baker reported from
Olympia, Wash. Associated Press writers Chris Grygiel in Seattle and
Terry Tang in Phoenix also contributed to this report.
Copyright 2013 The Associated
Press. All rights reserved. This material may not be published,
broadcast, rewritten or redistributed.
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