glor: good evening, everyone. scott is off tonight. i m jeff glor. the bridge was considered gacture critical, meaning if ene major part fails the rest does, too. tere is no backup. that is exactly what happened last night outside seattle when a truck hit a steel beam on the stagit river bridge, sending vehicles and passengers plunging into the water below. inl of it happened just as the holiday weekend begins. more than 30 million americans will travel over memorial day, and many will drive over a bridge in need of repair or replacement. we begin with henry rosoff from our cbs affiliate, kiro tv. the riverside bridge over i-5 collapsed. we have vehicles in the water. reporter: bryce kenning was driving north behind the truck that hit struck the beam. the truck cleared the bridge but the whole roadway gave way, plunging kenning 25 feet into the stagit river. there was a huge impact. all the airbags went off and the car started to rush with water, and that was when i k