American screw tug Nebraska (1929) in 1966

Active on the Great Lakes system. Operated by The Great Lakes Towing Co. Homeport Connecticut, Ohio, USA. Built in 1929 and modernized in 1955. Steel made. Net register tonnage 66 tons. Dimensions 78.8 (register)-84.3 (over all) x 20 (register)-21.3 (over all) x 12.5 and as highest fixed point above water (=spar) 21 feet. Horsepower 1.250 hp. Electric oil-fuelled.

Source

Corps of Engineers US Army. Transportation Lines on the Great Lakes System 1966. Transportation series 3.