Built in 1985, by Southern Shipbuilding Corporation of Slidell, Louisiana (hull #129) as the Arthur F. Zeman Jr. for Great Lakes Dredge and Dock Corporation of Oak Brook, Illinois.
The tug was then acquired by McAllister Towing and Transportation of New York, New York. Where she was renamed as the Megan McAllister.
Powered by two Caterpillar 3512 main engines with ZF Marine BW751 reduction gears at a ratio of 6:1 turning two 100(in) by 60(in) fixed pitch propellers for a rated 2,400 horsepower.
Her capacities are 31,578 gallons of fuel oil, 1,800 gallons of lube oil, and 3,233 gallons of potable water.
Her towing gear consists of an Intercontinental SD-125 single drum towing winch equipped with 1,500(ft) of 1 1/8(in) towing wire.