Current trends in Great Lakes shipping

Shipping on the Great Lakes has changed rapidly in recent years. Internal Great Lakes traffic consists almost entirely of bulk movements, primarily of iron ore, coal, limestone, and grain. Ore shipments are mainly of taconite concentrate. Low-sulfur coal from the western areas of the United States is now moving downbound through the lakes, a movement in the opposite direction from the predominantly upbound movement of Appalachian coal. Opening of a larger lock in 1970 between lakes Superior and Huron has initiated a new generation of lake vessels, which are three times the size of the previous lake ships, and are too large to transit the Welland Canal and the St. Lawrence Seaway; for the first time since 1959 the largest “lakers” are land-locked. General cargo traffic between the Great Lakes and overseas has been declining rapidly since 1970, largely as the result of the rapid development of container ships, and the Interstate highway system, which increases the competitive advantages of salt-water ports.