MOUNT VERNON, Wash. — A portion of an Interstate 5 bridge over the Skagit River, about 60 miles north of Seattle, collapsed Thursday, sending three vehicles and people plunging into the cold water at least 50 feet below. Amazingly, there were no fatalities, Skagit County authorities said. Three people were pulled from the river and taken to Skagit Valley Hospital and United General Hospital; two were reported to be in stable condition, the other had minor injuries and was being released Thursday night. The survivor who was released was identified as Dan Sligh, 47. His wife, Sally Sligh, 56, remained...