Built in 1976, by Fredeman Shipyard Incorporated of Carlyss, Louisiana (hull #113) as the Jim for the Port Arthur Towing Company Incorporated of Port Arthur, Texas.
In 1994, the tug was acquired by Hollywood Marine Incorporated of Houston, Texas. Where she was renamed as the Mark L.
In 1999, she was acquired by the Kirby Corporation of Channelview, Texas. Where the tug was renamed as the Miss Heather
In 2019, the tug was acquired by Superior Marine Ways Incorporated of South Point, Ohio. Where she was renamed as the Robert R. McCune.
Powered by two, Cummins KTA38-M0 diesel engines. With Twin Disc reduction gears, at a ratio of 5.17:1. She is a twin screw towboat, rated at 1,700 horsepower.