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Built in 1975, by the Sabine River Fuel Company of Orange, Texas as the Lou Ann Lee for the Sabine River Fuel Company of Orange, Texas.
In 1978, the tug was acquired by the Lee Towing Company Incorporated of Bridge City, Texas. Where she retained her name.
In 1979, she was acquired by the DOOH Towing Company Incorporated of Marrero, Louisiana. Where the tug was renamed as Monica Lee 3.
In 1981, the tug was acquired by the Rojas Towing Corporation of Belle Chasse, Louisiana. Where she retained her name.
In 1994, she was acquired by the Gator Marine Service Incorporated of Morgan City, Louisiana. Where the tug was renamed as the Heath Ira.
In 1995, the tug was acquired by Verret Shipyard Incorporated of Plaquemine, Louisiana. Where she was renamed as the Dustin Cole.
In 2003, she was acquired by Settoon Towing Incorporated of Pierre Part, Louisiana. Where the tug was renamed as the Carley G. Settoon.
In 2010, Settoon Towing Incorporated renamed the tug as the Grady L. Settoon.
In 2017, the tug was acquired by Savage Marine Services Incorporated of Salt Lake City, Utah. Where she was renamed as the Savage Sentinel.
In 2020, Savage Marine Services Incorporated was acquired by the Kirby Corporation of Channelview, Texas. Where the tug was renamed as the Colt.
In 2021, the tug was phased out of active service and was "laid up" at Port Arthur, Texas.
Powered by two, Cummins KT19-M diesel engines. With Twin Disc reduction gears, at a ratio of 5:1. Turning two, stainless steel, fixed pitch propellers. She was a twin screw towboat, rated at 900 horsepower.