Built in 1978, by McDermott Shipyard of Morgan City, Louisiana (hull #239) as the Admiral for Crowley Marine Services Incorporated of San Francisco, California.
She was the seventh Sea Swift class tug constructed by McDermott Shipyards for Crowley Marine Services Incorporated.
Designed by Naval Architect Phil Spaulding, the Sea Swift class was the first class of tugs constructed for Crowley Marine Services that were of a twin engine, and twin screw configuration. As well as a pilot house controlled engine room.
In 1985, the tug was acquired by Tidewater Marine Services Incorporated of New Orleans, Louisiana. Where she was renamed as the El Lobo Grande II.
In 1998, she was acquired by the Great Lakes Towing Company Cleveland, Ohio. Where she retained her name.
In 2002, the tug was acquired by the Sirius Maritime Company of Seattle, Washington. A division of Hawaiian InterIsland Towing Incorporated of Honolulu, Hawaii. Where the tug retained her name.
In 2006, the Sirius Maritime Company was acquired by the K-Sea Transportation Partnership Incorporated of East Brunswick, New Jersey. Where she retained her name.
In 2011, the K-Sea Transportation Partnership Incorporated was acquired by the Kirby Corporation of Channelview, Texas. Where the tug retained her name.
Powered by two, sixteen cylinder, EMD 16-645-E-7 diesel engines. Turning two, cast steel, fixed pitch propellers. Turning two, cast steel, fixed pitch propellers. She is a twin screw tug, rated at 5,750 horsepower.
Her electrical service is provided by two, 90kW generator sets. The tug's capacities are 165,000 gallons of fuel.
The towing equipment consists of a Markey TDSD-36, double-drum, towing winch. Outfitted with 2,200(ft) of 2.25(in) towing wire.