An 11-year-old girl was airlifted to Erlanger Medical Center on Friday after she was injured during a family swim outing at Pepper Branch Park.Kirstin Ogg was transported via helicopter after she was swept over the dam by fast-moving water. She reportedly suffered back and leg injuries during the accident.The incident took place Friday around 2 p.m. According to eyewitness reports, several people were jumping off the railroad tracks into the Barren Fork River.Ogg reportedly jumped off the tracks and swam over to the top of the dam to wait for the rest of her group to jump. Sitting on the concrete dam is common when the water level is low, but frequent rain created a fast-moving current Friday afternoon.Ogg was swept off the top of the dam and plunged about 15 feet onto concrete and rocks below.