The Seaway Trident was built at the Washburn & Doughty shipyard in East Boothbay, Maine, and is based on Glosten’s HT-60 concept tugboat. Glosten adapted the design for the GLS, which needed an agile tug that could navigate the icy conditions of the St. Lawrence Seaway. The Seaway Trident will perform construction work, routine maintenance of aids to navigation and ice management in and around lock chambers.  

At 60 feet in length, the tug was built to maneuver inside lock chambers, with a wide 28-foot beam to improve performance in ice and enhance stability for deck crane operations. The Seaway Trident is powered by a pair of Caterpillar C18 diesel engines and includes an ABS Ice Class C0 hull, a Markey Machinery headline winch and a fully foldable Heila Marine deck crane. 

Seaway Trident completed sea trials earlier this year and has already started maintenance operations on the St. Lawrence Seaway.