Built in 1970 by Albina Engine and Machine Works of Portland, Oregon as the Huki (hull #417) for the Hawaiian Tug and Barge Company Incorporated of Honolulu, Hawaii.
In 1977, the company's corporate name was changed to the Dillingham Tug and Barge Corporation of Honolulu, Hawaii.
In 1986, the Dillingham Corporation shed its maritime assets in favor of real estate investment, with Dillingham Tug and Barge and Young Brothers being acquired by Hawaiian Electric Industries Incorporated (HEI) of Honolulu, Hawaii. At this time, Dillingham Tug and Barge's corporate name was reverted back to Hawaiian Tug and Barge.
In 1999, Saltchuk Resources Incorporated of Seattle, Washington, acquired the maritime assets of HEI: the Hawaiian Tug and Barge Company, and the Young Brothers Company.
In 2002, the tug was acquired by the Knutson Towboat Company of Coos Bay, Oregon. She was then stripped to bare hull, rebuilt and renamed as the Humboldt.
In 2003, her existing powerplant was found to be inadequate, and the tug was repowered.
Powered by two, twelve cylinder, Cummins KTA 38 diesel engines turning two, fixed pitch propellers in Kort Nozzles. She is a twin screw tug, rated at 3,000 horsepower.