D.M. Clemson. Original Name: D.M. Clemson. Owner: Pittsburgh Steamship Co. Builder: American Ship Building Co., 1917, United States, Ohio, Lorain Engine Builder: American Ship Building Co., 1917, United States, Ohio, Lorain Year Built: 1917 Year Engine Built: 1917 Final Disposition: Scrapped at Thunder Bay, Ontario in 1980. Remarks: IMO# 508366 Registry Number: US. 214599 Hull Number: 716 Vessel Type: Bulk freighter Length: 580 ft. Width: 60 ft. Height: 32 ft. Gross Tonnage: 7377 t. Net Tonnage: 5830 t. Materials: Steel Engine Type: Triple expansion Piston #1: 24 in. Piston #2: 41 in. Piston #3: 65 in. Stroke Length: 42 in.