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MAUNA LOA
Pictured as: the Mauna Loa (Salmon Bay Barge Line) Photo by: Kyle Stubbs

Built in 1963 by San Diego Marine Construction of San Diego, Calfornia (hull #136) as the Mauna Loa for the Star and Crescent Towboat Company of San Diego, California.

In 1968, she was acquired by the Washington Tug and Barge Company of Seattle, Washington. Where the tug was renamed as the Alapul.

In 1979, the Washington Tug and Barge Company was acquired by the Knappton Towboat Company of Astoria, Oregon. Where the tug was renamed as the Portland.

In 1988, the Knappton Towboat Company was rebranded as the Brix Maritime Company of Seattle, Washington. Where the tug retained her name.

The tug was later acquired by the American Navigation Company of San Francisco, California. Where she retained her name.

In 1998, she was acquired by Alaska-Oregon Offshore Marine Incorporated of North Bend, Oregon. Where the tug was renamed as the Mauna Loa.

In 2004, the tug was acquired by Salmon Bay Barge Lines Incorporated of Seattle, Washington. Where she retained her name.

She is a single screw tug, rated at 2,200 horsepower.
(Kyle Stubbs)


  • Vessel Name: MAUNA LOA
  • USCG Doc. No.: 290484
  • Vessel Service: TOWING VESSEL
  • IMO Number: 5229704
  • Trade Indicator: Coastwise Unrestricted, Registry
  • Call Sign: WDC2819
  • Hull Material: STEEL
  • Hull Number: 136
  • Ship Builder: SAN DIEGO MARINE CONSTRUCTION
  • Year Built: 1963
  • Length: 113
  • Hailing Port: PORTLAND, OR.
  • Hull Depth: 15.3
  • Hull Breadth: 27
  • Gross Tonnage: 147
  • Net Tonnage: 100
  • Previous Vessel Names:
    MAUNA LOA, ALAPUL, PORTLAND, MAUNA LOA
  • Previous Vessel Owners:
    STAR AND CRESCENT TOWBOAT COMPANY, WASHINGTON TUG AND BARGE COMPANY, KNAPPTON TOWBOAT COMPANY, BRIX MARITIME COMPANY, AMERICAN NAVIGATION COMPANY, ALASKA-OREGON OFFSHORE MARINE INCORPORATED, SALMON BAY BARGE LINE INCORPORATED