Can ships access the Great Lakes from the ocean? Can ships get to the Great Lakes from the ocean?

The Great Lakes, a chain of freshwater lakes located in northeastern North America, are a vital part of the continent’s economy and transportation system. But can ocean-going vessels reach these inland seas? Let’s explore this fascinating topic.

The Great Lakes Waterway is a system of natural channels and artificial locks and canals that enable navigation between the North American Great Lakes. This waterway allows passage from the Atlantic Ocean to the inland port of Duluth on Lake Superior, a distance of 2,340 miles, and to Chicago, on Lake Michigan, at 2,250 miles. The elevation change from Lake Superior to sea level is 601 feet.

Accessing the Great Lakes from the Ocean

Yes, ships can access the Great Lakes from the ocean. The St. Lawrence Seaway, which connects the Great Lakes to the Atlantic Ocean, allows navigable shipping from the Great Lakes Waterway to the Atlantic Ocean. This seaway is co-administered by the governments of Canada and the United States.

However, there are a few factors to consider:

1. Size of the Vessels: The St. Lawrence Seaway has locks that are smaller than those on the Great Lakes. Therefore, the largest ocean-going vessels cannot use the Seaway locks and are restricted from entering the Great Lakes.

2. Navigational Challenges: The Great Lakes Waterway has larger locks and deeper drafts than the lower Seaway, limiting large freighters to the four lakes upstream of the Welland Canal and Lake Ontario and similarly restricting passage beyond Saint Lambert, Quebec by larger ocean vessels.

3. Seasonal Limitations: Usually, one or more U.S. Coast Guard icebreakers help keep the water passage open for part of the fall and early winter, although shipping usually ceases for two to three months thereafter due to ice.

While it is technically possible for ships to access the Great Lakes from the ocean, there are several limitations and challenges to consider. Despite these challenges, the Great Lakes Waterway and the St. Lawrence Seaway provide a crucial link between the interior of North America and the Atlantic Ocean, facilitating commerce and transportation.