Lake Superior is the largest of the Great Lakes. With a surface area of nearly 32,000 miles and a deepest point of 1,332 feet, Lake Superior could hold all the water in Lakes Huron, Michigan, Ontario and Erie, plus three additional Lake Eries. That’s approximately 3-quadrillion gallons of fresh water.
Lake Superior serves to connect the heartland to the global economy via the St. Lawrence Seaway. This navigable channel flows from Duluth to the Atlantic via Québec through a series of 15 locks. Opened in 1959, vessels following “Highway H2O” typically navigate the 2,038 nautical miles at about 10.4 knots (12 mph) in about 8.5 days.
The Duluth-Superior port ships over 32-million tons of cargo a year, primarily ore, coal and grain.