A man was rescued by first responders after he was stranded crossing the Rock River and having a medical issue early Monday, officials said. The Janesville Police Department said officers and firefighters responded at 5:30 a.m. to the area of the Center Avenue Bridge near 900 Center Avenue to check on a person’s welfare. According to the report, a 51-year-old man was experiencing a medical event and was stranded on the railroad trestle crossing the Rock River. The man was brought to safety with the help of the Janesville Fire Department.