RedactedNarrative: Operator was pulling a tube with two people on it.  There was a spotter in the boat.  One tuber fell off the tube in the river.  The operator attempted to complete a u-turn to retrieve the fallen tuber too close a dock.  As the operator turned left, the occupant remaining on the tube was ejected and struck a pier.  The spotter on the vessel immediately jumped into the water to assist the injured tuber.  The victim hit the pier face first with other strikes following.  Both individuals thrown from the tube were wearing type 2 PFDs.