Built in 2009, by Nichols Brothers Boatbuilders Incorporated of Seattle, Washington (hull #S-155) as the Delta Billie for Bay and Delta Maritime Services Incorporated of San Francisco, California.
In 2022, the tug was chartered to AmNAV Maritime Services of Oakland, California. A subsidiary of the Foss Maritime Company of Seattle, Washington. Where she retained her name.
Powered by two, Caterpillar 3516C diesel engines, with Rolls Royce US255 z-drives for a rated 6,800 horsepower.
Her electrical service is provided by one, 215kW generator set. Driven by a single, Caterpillar diesel engine. And, one, 50kW generator set. Driven by a single Caterpillar diesel engine. The tug's capacities are 70,000 gallons of fuel, 8,000 gallons of water, and 1,400 gallons of sewage.
The tug's towing equipment consists of a single drum, towing winch. Outfitted with 2.5(in) towing wire.