Lake Frohna. Original Name: Lake Frohna. Owner: United States Shipping Board, 1919-1924, United States, Washington D.C. Builder: American Ship Building Co., 1919, United States, Ohio, Lorain Engine Builder: American Ship Building Co., 1919, United States, Ohio, Lorain Year Built: 1919 Year Engine Built: 1919 Final Disposition: There are two conflicting dispositions recorded: 1) Torpedoes off west coast of British Columbia, in position 50 degrees 20 feet North x 131 degrees 32 feet West, on June 26, 1944. 2) Struck a rock and sank, Pitt Island, British Columbia, on September 29, 1946. Raised and scrapped. Registry Number: US. 218268 Hull Number: 759 Vessel Type: Laker Length: 251 ft. Width: 43.6 ft. Height: 26.2 ft. Gross Tonnage: 2616 t. Net Tonnage: 1611 t. Materials: Steel Engine Type: Triple expansion Piston #1: 20 in. Piston #2: 33 in. Piston #3: 54 in. Stroke Length: 40 in.