PORTLAND, Ore. -

 Rescue teams in boats looked for a man who jumped from Portland's Ross Island bridge early Thursday, but didn't find him. A friend told police the young man took off his shoes and shirt to swim the Willamette River below.

At its center the bridge is 123 feet above the water. Police said he jumped from the east end.

Police said they don't suspect criminal activity or a suicide attempt, but alcohol may have been a factor in his decision.

Police learned he'd jumped when they went to the bridge about 3 a.m. to look into a report that two men were on it, one shirtless and leaning over the rail.