 Barrie exerted himself in a number of maritime-related matters, including the International Boundary Commission.He promoted a hydrographic survey of the Saint Lawrence River and the Great Lakes, the building of the Rideau and Welland canals, and relations with the United States.He became particular friends with a number of politicians, including Governors Lord Dalhousie and his successor Lord Aylmer, and Sir Peregrine Maitland and his wife Lady Sarah.