“I figure I crossed about 10 minutes before it happened,” he said. “That’s just too close to call.”

He was standing about 200 feet away on top of a parking ramp with large group of people.

“I’ve never seen anything like this,” he said.

The arched bridge, which was built in 1967, rises about 64 feet above the river. Workers have been repairing the 40-year-old bridge’s surface as part of improvements along that stretch of the interstate, the Minneapolis Star-Tribune reported on its Web site.