A new three-year contract between unionised workers on the St Lawrence Seaway and their employers was ratified on Friday, ending a labour strife that shut down the critical waterway for more than a week.

St Lawrence Seaway Management Corp (SLSMC) and Unifor, a union representing 360 workers on the Canadian side of the system of locks and canals that connects the Great Lakes to the Atlantic Ocean, announced the ratification on Thursday.