RedactedNarrative: The operator of vessel 1 was operating a 16'2" Bass Tracker Pro 160 remote steer aluminum vessel (LA 3401 GC) in the public waterway of Old River.   Operator advised that he was traveling northwest at a slow rate of speed.  Operator advised that he was not wearing a PFD but did have the engine kill lanyard attached to his person.  Operator began to travel over the flooded roadway of Old River Dam Road.  Operator struck the roadway with the motor propeller, which turned the motor off.  Vessel 1 began to get pushed due to the swift flood waters.  Eventually Operator was able to get the motor started, but was unable to maneuver Vessel 1 to avoid striking a tree.  Vessel 1 struck the tree and began taking on water, which sent Operator into the water.  Vessel 1 capsized and submerged the engine.  Alcohol/drug use was not a contributing factor in this incident.