The Janesville Fire Department is warning boaters to be wary of this spring's fast moving Rock River after a water rescue this morning. Fire Lieutenant John McManus says a fisherman expected a pleasant day on the water when he launched his small flat bottom craft at the River Street Landing. McManus says the man ended up capsizing his boat near the pedestrian bridge by Jackson Street. He was not wearing a life preserver. A police officer was first on the scene and coached the man to hang on to the bridge. McManus called it a pretty simple rope rescue to get the man out of the water. He says ironically they were practicing the very same rescue technique at the fire station when the call came in. The man's boat is another matter. It ended up snagged near the middle of the river by the Monterey Bridge.