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Advocacy Cargo Infrastructure Sustainability Resiliency Economy Safety Commerce Trade Advocacy Communications Cargo Reports Reference Materials About the LCA LCA Newsroom About the Industry Our Advocacy Efforts Great Lakes Shipping Since 1880 Lake Carriers has represented the U. S. flag Great Lakes fleet which today moves more than 90 million tons of cargo annually. The cargos including iron ore limestone coal cement and other dry bulk materials such as salt sand and grain are the foundation of American industry infrastructure and power.