Just out of curiosity; how many vessels (not only tug/barges and never mind nationalities) have run aground / caused pollution along the IP, or the Strait of Juan de Fuca in US waters in say the last 10 years?
Better still; break it down by flag state and severity of pollution caused.
One more question; how many US companies with pilotage waivers for the IP spend the time and money to train their navigators the way Coastal Transportation do?: Coastal Transportation’s YouTube Series