American screw tug Little Erv (1955) in 1966

Operated by Deneen River Co. Homeport Peoria, Illinois, USA. Built in 1955. Net register tonnage 10 tons and as dimensions 38.8 x 9.1 x 3feet. Oil-fuelled, horsepower 145 hp. Active on the Great Lakes system.

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