Built in 2008, by Thoma-Sea Boat Builders Incorporated of Houma, Louisiana (hull #139) as the Severn for the Vane Brothers Company of Baltimore, Maryland.
She was the fifteenth Patapsco class tug designed by Frank Basile of Entech and Associates of Houma, Louisiana. And constructed by Thoma-Sea Boat Builders for the Vane Brothers Company.
Named for the Severn River, which runs 14 miles through Anne Arundel County in Maryland. Located south of the Magothy River, and north of the South River.
From its headwaters in western Anne Arundel County in Gambrills, the river enters the Chesapeake Bay at the major port city of Annapolis. Also, the capital of Maryland. Most famous for the United States Naval Academy campus situated at the mouth of the river.
The Severn provides an access point to the Chesapeake Bay for fishermen, hobby boaters, and Midshipmen. Its nontidal portion is called Severn Run, has several branches, including Jabez Branch. Several of its creeks drain highly developed areas, including Weems Creek and its nontidal portion Cowhide Branch, which drain most of the Annapolis Mall and the Anne Arundel Medical Center.
Powered by two, Caterpillar 3516 diesel engines. With Reintjes WAF-872 reduction gears. Turning two, 97(in), fixed pitch, propellers. Mounted in CNF, Type 37, kort nozzles. She is a twin screw tug, rated at 4,200 horsepower.
The tug's electrical service is provided by two, 72kW, Caterpillar 3054T generator sets. Her capacities are 89,910 gallons of fuel oil, and 8,816 of potable water.
Her towing gear consists of an INTERcon, double drum, towing winch. Driven by a dedicated John Deere diesel engine.