U.S. Great Lakes ports are on pace to beat 2018 cargo volumes following a robust September handling road salt, cement, stone, petroleum and wind energy components.“U.S. Great Lakes ports are reporting cargo growth as they support the region’s construction activity and energy needs and help our cities prepare for the winter ahead,” said Bruce Burrows, President of the Chamber of Marine Commerce. “Iron ore exports from Minnesota to Japan and China via the St. Lawrence Seaway are also continuing.”Overall, St.