PONTOON BOAT WAS NAVIGATING DOWNSTREAM TOWING 3 RIDERS ON A TUBE.  BOAT ENCOUNTERED ANOTHER BOAT MOVING UPSTREAM. PONTOON BOAT CROSSED IN FRONT OF THE OTHER BOAT OVER TO THE WISCONSIN SIDE OF THE RIVER. THEN THE PONTOON BOAT TURNED STARBOARD (RIGHT) AT AN ESTIMATED SPEED OF 10-15 MPH. DURING THE TURN THE PONTOON TURNED INTO & ENCOUNTERED THE OTHER BOAT'S WAKE CAUSING THE TUBE TO SWING OUT OF THE PONTOON BOAT'S WAKE AND COLLIDE WITH A NAVIGATIONAL BUOY. ONE OF THE THREE TUBE RIDERS STRUCK HIS HEAD ON THE BUOY AND SUFFERED HEAD INJURIES.
LYNSVILLE                     