RedactedNarrative: At approximately 2125, Sgt. and I arrived on scene at Rockingham Marina on Boone Lake in Washington County. Upon arrival, I saw the burning vessel (V1-1981 30'' Carver) being towed by a marina work barge away from the boat slip. The vessel (V1) was completely engulfed in flames. It was towed around the marina to the shore for the fire department to extinguish the fire. The vessel (V1) burnt down to the water line. I met with State Fire Marshal, and he deemed the cause of the fire to be undetermined. A 30'' Carver cabin cruiser was a total loss and pontoon boat (V2) that was moored in the adjacent boat slip to boat (V1) suffered radial thermal damage. No one was on board either vessel and no one was injured during this accident.