RedactedNarrative: An unoccupied, docked houseboat Vessel 1 was hit by  Vessel 2 a commercial tug pushing a scow.  Operator of Vessel 2 tried to go in reverse after he believed he hit a submerged obstacle in the channel resulting in the bow of the scow to come around and strike vessel 1.  Vessel 1 sustained damage to the hull. No injury was reported.