Built in 1985, by the Southern Shipbuilding Corporation of Slidell, Louisiana (hull #129) as the Arthur F. Zeman Jr. for the Great Lakes Dredge and Dock Corporation of Oak Brook, Illinois.
In 2004, the tug was acquired by the McAllister Towing and Transportation Company of New York, New York. Where she was renamed as the Megan McAllister.
Powered by two, Caterpillar 3512 diesel engines. With ZF Marine BW751 reduction gears, at a ratio of 6:1. Turning two, 100(in) by 60(in), stainless steel, 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 equipment consists of an Intercontinental, SD-125 single drum, towing winch. Equipped with 1,500(ft) of 1.8(in) towing wire.