Thunder Bay is a Trillium-class lake freighter cargo vessel, built and launched in China in 2013.

Like her three sister ships in CSL's Trillium class, Baie St. Paul, Baie Comeau, and Whitefish Bay, the vessel is a self-unloading bulk carrier, with a conveyor belt on a long boom that can be deployed over port or starboard sides.

The ship is powered by one IMO Tier III MAN B&W 6S50ME diesel engine driving one shaft creating 8,750 kilowatts (11,730 hp).

[6] She was launched on 13 May 2013 and made her first transit of the Saint Lawrence Seaway in July 2013, and visited her namesake port, Thunder Bay, Ontario, on 27 September 2013.

[7][8] Louis Martel, President of CSL, Vance Badawey, mayor of Port Colborne, and Rick Dykstra, Member of Parliament for nearby St. Catharines, Ontario, presided over a celebration of the vessel's first cargo, on 8 August 2013, when she passed through Port Colborne, bound for Quebec City with a shipment of iron ore pellets from Escanaba, Michigan.