RedactedNarrative: The operator was paddling across the Peshtigo River within one hundred yards of the dam.  A boil hit him in the middle of the boat and he took on water.  The boat filled up with water and the boat capsized.  The operator of the boat was then tossed from the boat.  He was caught in the undertow and taken upstream towards the dam.  He was able to pop up and start swimming down steam.  He was caught in that same vortex (process) for approximately ten minutes before he was rescued and taken to shore. Operator had .02 BAC.