RedactedNarrative: Vessel one was at anchor in the Ft George River at the confluence of Simpson Creek. The anchor began to drag causing the vessel to drift towards the North West shoreline. The operator engaged the motor in reverse while unaware that one of the occupants was on the port side, stern swim ladder. The prop struck the occupant's right leg in the calf and upper thigh causing serious injury.  Subject received numerous lacerations and contusions to her right leg in the thigh, calf, and back of leg.