Built in 1943, by the Brunswick Marine Construction Company of Brunswick, Georgia (hull #102) as the Port Clinton for United States Maritime Commission.
In 1945, the tug was acquired by New Haven Transport (Dalzell Towing) where she was renamed as the Captain. In the 1950's Dalzell renamed the tug as the Fred B. Dalzell.
In 1964, she was acquired by the Portsmouth Navigation Company of Portsmouth, New Hampshire. Where she as renamed as the New Castle.
The tug was later acquired by the Moran Towing Corporation of New York, New York. Where she retained her name.
In 1982, the tug was acquired by Winslow Marine of Southport, Maine. Where she was renamed as the Eliot Winslow.
She is a single screw tug rated at 2,500 horsepower.