Operator was operating her father's boat with her kids on board. She pulled up to the boat dock slip to let her daughter off of the boat. There were swimmers in the water a few feet behind a boat that was in the slip next to the one Operator let her daughter off on. Operator then backed the boat up and began to make her turn to head out from the boat dock. She was drifting backwards and did not want to run the motor into the bottom, so she gave it gas and turned the boat sharply. She saw the swimmers in the water and thought she had enough room to make the turn. She then saw that she was going to hit the swimmers at the last second and did not have enough time to react. She ran over 3 of the 4 people swimming in the water. 2 swimmers were bumped in the head and had no injuries. 2 female swimmers were injured. Victim1 was struck in the head by the boat, and struck in the foot by the propeller, causing broken toes and a laceration to the side of her foot. Victim2 was struck in the head by the boat and her calves were cut to the bone by the propeller. Victim1 was taken by ambulance to Lewisville Hospital and treated. Victim2 was life flighted to Parkland Hospital in Dallas and treated. I interviewed Operator and could not smell or observe any signs of alcohol. She was administered SFST and did not show signs of intoxication. I believe that this incident was an accident, and caused by Operator miss-judging her turn and not having enough reaction time to reduce the throttle, turn, or back the boat up.
Lewisville                    