Police cleared traffic, cyclists and pedestrians from the eight-lane bridge before the ship arrived, keeping it closed for 10 minutes as the ship steamed underneath, authorities said.
Prime Minister Justin Trudeau and other Canadian officials have said they are monitoring the American tariff policy, but have not committed to following suit.
The Canada Border Services Agency — made up of over 9,000 border workers — previously set a June 6 deadline to reach a collective bargaining agreement.