>> reporter: all three people inside those cars survived, including 20-year-old bryce kenny. >> it was just a straight nose dive into the water. >> reporter: federal and state inspectors say a truck with an oversize load is to blame. >> a very heavy vehicle crashed into not just one but probably multiple girders on the bridge and it failed. >> reporter: the truck driver william d. scott is being questioned by investigators. his wife says her husband is okay. >> he is shaken up. he was really scared for the people that were -- who had fallen off the bridge and he was really happy to hear that they were fine, to see that they were fine. and that was the real blessing. >> reporter: the skagit river bridge about 1100 feet long was built in 1955. inspected just last november, it was listed as functionally obsolete by the federal highway administration. which means the design is outdated, but structurally sound. >> it was generally a healthy bridge. and it could continue to operate. that doesn't mean that there aren't things that could have