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(CNN) -- Dan Sligh could see it coming. An 18-wheeler carrying an oversize load had just struck part of the Interstate 5 bridge over Washington's frigid Skagit River. And the pavement was giving way. He slammed on the brakes, but the momentum of his truck and trailer carried Sligh and his wife off the bridge and into the water dozens of feet below, he told CNN affiliate KOMO Thursday, hours after the incident some 60 miles north of Seattle. "You hold on as tight as you can," Sligh said. Then, a "white flash and cold water." The impact dislocated his shoulder, but the Navy veteran just popped it back in and dragged his unresponsive wife to safety. Photos: Washington bridge collapses into river Another driver also fell from the bridge, according to state officials. Amazingly, no one died. Witness: The bridge was just gone "Rough day," Sligh told KOMO. "Glad to be here breathing." The collapse was the result of a collision between the tractor-trailer and the overhead structure of the bridge, Washington State Patrol Chief John Batiste told reporters. "The size of the load that he was carrying appeared to create a problem, causing him to strike the bridge," he said. It had been rated "functionally deficient," according to a federal database, but it was not clear Friday if the bridge's condition played any role in the collapse. Sligh told KOMO he was traveling south on the interstate behind the tractor trailer when he realized the load appeared to be about four feet too wide to fit through the bridge's superstructure. "Anytime he wants to go over to the left would be OK," Sligh said he told his wife. But another tractor-trailer appeared to hem the truck in to the right lane. "There was a big puff of dust, and I hit the brakes." Dale Ogden told CNN affiliate KING that he was driving near the tractor-trailer's pilot car when he saw a device on that car designed to indicate whether a truck can clear an obstacle hit the top of the bridge. He then watched in his rear-view mirror as the truck struck the bridge, he told KING. "It almost tipped the truck over but it came back down. It tipped it up to about a 30 degree angle to the left and it came back down on its wheels, and almost instantaneously behind that I saw girders falling in my rear-view mirror," he said. The truck's driver was questioned but not detained, state police said. State police and a federal transportation safety team are investigating the collapse along with the state transportation agency. The bridge carries about 77,000 cars a day, according to the Washington State Department of Transportation.