RedactedNarrative: Operator was traveling north on the Upper Niagara River when he hear a loud noise from the rear of the vessel.  Water began to come in rapidly from the transom in the vicinity of the engines.  Operator was able to bring vessel close to a nearby marina.  A passing vessel was able to tow it into the docks where everyone was removed from the vessel.  The vessel sank with just the bow remaining above water at the dock.