Several hull sections and scattered structural debris rest near shore on a sandy bottom with mixed patches of cobble and a light covering of a reddish silt. Although the steam machinery was salvaged, most of the vessel's hull remains. The largest remaining section is the lower hull, which includes the keel , keelson , and floors. Most of the bilge ceiling is intact, along with the boiler beds, engine beds, and the propeller shaft tube. In the stern , the deadwood , rudder head, and horn timber survive, along with most of the port fantail . Although the sides of the hull were burned, much remains up to 6 feet above the turn of the bilge from the fantail in the stern to the bow . Debris, including brick, steam pipe, and burnt glass and china litter the wreck. The most prominent feature of the wreck is the Ottawa's entire 158-footlong port side and lower hull, which run from the stem to the sternpost and fantail. It has survived nearly intact and lies parallel to the north shore of Red Cliff Bay in 12 to 16 feet of water. A 58-foot section of the starboard bow that included the stem assembly lies forward and inshore of the major hull section. Both port and starboard bow sections contain cant frames , exterior planking, bilge ceiling, and portions of deadwood used to reinforce the stem. An additional 65-foot section of the starboard side of the vessel lies parallel and adjacent to the major hull section amidships . A 30-foot long section of the starboard quarter lies inshore of the port fantail and stern. Divers can visit the Ottawa's rudder by swimming 75 feet to the west of the bow. Although it has been broken up by fire, ice, salvage, and scavenging by sport divers, the Ottawa wreck still has a great deal of architectural integrity. Its lower hull remains mostly together, and even the smaller parts that have separated from the main wreck offer significant information about the Ottawa's construction. The ship is one of only a few large tow tugs wrecked in Wisconsin waters and virtually the only example of a wrecking tug. The Ottawa wreck was listed on the National Register of Historic Places in 1992.