Built in 1977, by Main Iron Works of Houma, Louisiana (hull #319) as the Mamo II Dillingham Tug and Barge of Honolulu, Hawaii.
The tug was later acquired by Foss Maritime of Seattle, Washington. Where she was renamed as the Daniel Foss. In 2006, the tug was reconfigured from a Voith cycloidal drive unit to a azimuthing stern drive configuration.
Powered by three Caterpillar 3512 B diesel engines with two stern mounted Ulstein 900 NautiCAN "z-drives" with a third Ulstein 900H UHPN "z-drive" mounted forward for a rated 3,300 horsepower.