SUPERIOR, Wis. — Crews have rescued a 41-year-old man who spent the night on a piece of ice on the St. Louis River in Superior.

The Superior Fire Department was called around 3 a.m. Tuesday after a passer-by heard someone shouting for help on the ice.

The stranded man had been surrounded by open water about 300 yards from shore since 9 p.m. Monday. He apparently had been in the water at least once and was showing signs of hypothermia.

Superior police, an ambulance and the St. Louis County Rescue Squad assisted in the rescue.

The man was treated and released from St. Luke’s hospital. No information was given about why the man was on the river.