RedactedNarrative: On May 5, 2020 Operator was operating an 18 ft. flat tiller handle motor boat, north bound in Boeuf River.  Operator stated he was traveling at approximately 15-20 miles per hour.  There was 6 passengers in the vessel including an 8-year-old juvenile passenger.  This juvenile passenger was seated at the front of the vessel at this time, and was wearing a USCG approved type III PFD.  For reasons unknown, the juvenile passenger fell over the bow.  Subject was looking at the bank at that precise second and did not see this happen.  The vessel traveled over the top of the juvenile passenger, and he was struck by the prop.  This caused serious bodily injury to his head and left arm.  The juvenile was retrieved from the river and transported to the hospital and is expected to make a full recovery. Drugs or alcohol were not suspected as a contributing factor to the incident.