RedactedNarrative: Watercraft was pulling a tube with two occupants. The boat made a left turn and when the tube crossed the wake, it flipped. One occupant of tube hurt her back (she has history of back surgery and back fusion). The other occupant was uninjured. The boat operator said he was not going too fast, he figures between 15 to 20 MPH. Life jackets were worn by all. Alcohol was not a factor.