Built in 1962, by the Dravo Corporation of Neville Island, Pennsylvania as the Mary B. for the Rebel Towing Company of Houston, Texas.
In 1965, the tug was acquired by the Thomas Petroleum Transit Company of Butler, Pennsylvania. Where she was renames as the Walter Curdy.
In 1976, she was acquired by Ashland Oil Incorporated of Freedom, Pennsylvania. Where the tug was renamed as the City of Louisville.
In 1993, the tug was acquired by the TPT Transportation Company of Baton Rouge, Louisiana. Where she retained her name.
In 1995, she was acquired by the Brent Towing Company of Greenville, Mississippi. Where the tug retained her name.
In 1998, the tug was acquired by the Kirby Corporation of Channelview, Texas. Where she retained her name.
In 2019, the tug was acquired by GraeStone Logistics LLC. of Murray, Kentucky. Where she retained her name.
Powered by two, GM 16-567C-E2 diesel engines. With Falk reduction gears, at a ratio of 3.75:1. She is a twin screw, towboat, with kort nozzles, rated at 3,200 horsepower.