RedactedNarrative: Operator said he was towing Subject1 on a tube near Public Beach about 3 p.m.  The water was somewhat rough due to wind and traffic, so he was trying to keep her in the wake behind the boat.  He slowed down because he could see they were going to cross a large wake.  The tube swung out of his boat's wake and flew high into the air as the crossed the other wake.  Subject1 remained on the tube but landed quite hard.  Operator was concerned about a neck or back injury.  He called 911 and the Glen Ullin ambulance responded to Public Beach and transported Subject1 to Elgin.  Her grandmother accompanied her to the hospital.