The Helen H. was built in 1967 by Bludworth Shipyard of Houston, TX as the W. Douglas Masterson for M.E. Kuebler. The Masterson was later acquired by Bay Houston Towing, who kept her name. In 1987 the tug was repowered. Heritage Marine of Duluth, MN purchased the W. Douglas Masterson in 2011. She came to the Great Lakes and was renamed Helen H. later that year.
Helen H. keeps busy in the Duluth-Superior harbor assisting ships, towing, and breaking ice.
- Type: Single Screw Tugboat
- Year Built: 1967
- Builder: Bludworth Shipyard, Houston, TX
- Hull No.: 69
- Horsepower: 1,700 bhp
- Length: 82′ 03″
- Breadth: 26′ 08″
- Depth: 10′ 05″
- Port of Registry: Knife River, MN