Built in 1999, by Thoma-Sea Boatbuilders Incorporated of Houma, Louisiana (hull #110) as the Dumar II for the Dolphin Marine Company of Golden Meadow, Louisiana.
In 2002, the Dolphin Marine Company was recognized into the Dolphin Marine International Company of Golden Meadow, Louisiana. Where the tug was renamed as the Dolphin II.
In, 2010, the the Dolphin Marine International Company was acquired by Harvey Gulf International Marine Incorporated of New Orleans, Louisiana. Where she was renamed as the Harvey Spartan.
In 2010, the tug was acquired by the Crosby Marine Transportation Company of Golden Meadow, Louisiana. Where she was renamed as the Crosby Liberty.
In 2016, she was acquired by the Kirby Corporation of Channelview, Texas. Where the tug was fitted with an upper wheelhouse. And, was renamed as the Brooke Chapman.
In 2022, the tug was acquired by the Sause Brothers Ocean Towing Company of Coos Bay, Oregon.
Powered by two, twelve cylinder, EMD 12-645-E7C, turbo, keel, and grid cooled, diesel engines. With Reintjes WAF2345 reduction gears, at a ratio of 4.041:1. Turning two, 106(in) by 99(in), cast steel, fixed pitch, propellers mounted in kort nozzles. For a rated 4,600 horsepower.
Her electrical service is provided by two, 99kW generator sets. Driven by two, GM 8v71 diesel engines. The tug's capacities are 80,000 gallons of fuel oil, 1,100 gallons of lube oil, and 8,000 gallons of potable water.
The tug's towing gear consists of a McElroy DT-84, double drum, towing winch. Outfitted with 3,000(ft) of 2(in) towing wire. As well as a, McElroy hydraulic towing pin system. And, a 750(lb) Danforth anchor.