RedactedNarrative: The watercraft was operating on the lake between a hazard buoy and Deer Island when it struck a submerged rock. The operator is familiar with the lake and says he has driven through there before. The injured party had been sitting in the front end of the boat with her back to the bow. The collision caused her back to strike a flat platform behind her. Other passengers also fell from their seats to the floor, but were uninjured. The operator estimated his speed to be 10 mph. Two children in the boat were wearing life jackets but the three adults were not. The injured party was transported to a local hospital by ambulance, complaining of severe back pain. Alcohol was not a factor. There was some damage to the watercraft.