It was around midnight Friday when rescuers were called to the Mad River Bar and Restaurant in the 4100 block of Main Street.
There, they learned a man fell 20 feet from the rear deck and landed in the river. He managed to climb onto a platform where he got stuck.
Firefighters were able to reach the man, who was suffering from ankle and chest injuries.
He was taken to the hospital in stable condition.
There was no immediate word on the man's identity or how the fall happened.