Built in 1970, by McDermott Shipyard of Morgan City, Louisiana (hull #167) as the Ocean Star for the L and L Marine Service Incorporated of St. Louis, Missouri. A subsidiary of the Apex Oil Company of St. Louis, Missouri.
In 1975, she was acquired by the Foss Maritime Company of Seattle, Washington. Where she was renamed the Agnes Foss.
In 2004, the tug was acquired by the SeaCoast Transportation Company of Seattle, Washington. Where she was renamed as the Pacific Raven.
In 2007, Sea Coast Transportation was acquired by the K-Sea Transportation Partnership of East Brunswick, New Jersey. Where the tug retained her name.
In 2011, the K-Sea Transportation Partnership was acquired by the Kirby Corporation of Channelview, Texas. Where the tug retained her name.
Powered by two, twelve cylinder, EMD diesel engines. Turning two, cast steel, fixed pitch propellers. She is a twin screw tug, rated at 3,000 horsepower.
Her electrical service is provided by two, 98kW generator sets. The tug's capacities are 91,908 gallons of fuel.