Built in 2017, by Diversifed Marine Incorporated of Portland, Oregon (hull #32) as the Teresa Brusco for the Brusco Tug and Barge Company of Longview, Washington.

In 2017, the tug was chartered AmNAV Maritime Services of Oakland, California. A subsidiary of the Foss Maritime Company of Seattle, Washington. Where the tug retained her name.

Powered by two, Caterpillar 3512C diesel engines. Turning two, 94.5 (in) propellers. Mounted in Rolls Royce 205 z-drives, for a rated 4,732 horsepower.

Her electrical service is provided by two, 99 kW Caterpillar C4 ACERT generator sets. Her capacities are 6,700 gallons of fuel, 500 gallons of fresh water, and 100 gallons of lube oil.

The towing equipment consists of a 50 horsepower, single drum, Markey DEPC-48, winch. Mounted on her bow, with 600(ft) of 2 5/8(in) Samson Saturn-12 line.