We welcome your participation! Map of the North American Great Lakes and the St. Lawrence Seaway from 1959, depicting the entire length beginning at the Gulf of Saint Lawrence in the east to the western-most terminus at Lake Superior. Massive public works projects have been carried out by both the United States and Canada to construct channels and locks. We use cookies to ensure that we give you the best experience on this website. The upbound direction is away from the St. Lawrence River (westerly or northerly except in Lake Michigan where upbound is southerly). Great Lakes and Seaway Shipping Web Page the online source for Great Lakes commercial shipping information. Know that you'll need to take the mast down to transit the Erie Canal at a rate of about $4-$8 per foot of mast. The lock chamber is gated on either end. The St. Marys Falls Canal and Soo Locks are located at Sault Ste Marie, Michigan and were constructed by the U.S. Army Corps of Engineers. Dredged channels were constructed in the St. Marys River, the Detroit River, Lake St. Clair and the St. Clair River between Huron and Erie. The canal includes eight successive navigation locks which lift or lower ships 326.5 feet from Lake Ontario to Lake Erie, bypassing Niagara Falls. After a ships enters a lock, water is pumped into or out of the chamber, causing the vessel to rise or fall. If you continue to use this website we will conclude that you accept this practice. Updated daily the page features up to the minute News, vessel passages from around the lakes and seaway, extensive Photo Galleries, Facts and Figures, Where to Buy, Calendar of Events, comprehensive list of Links, Chat room and much more. Natural obstructions such as rocks, shallow water, dangerous rapids, and waterfalls all had to be tamed, controlled and/or bypassed to enable safe navigation. The two waterways are often jointly and simply referred to as the "St. Lawrence Seaway", since the Great Lakes, together with the St. Lawrence River, comprise a single navigable body of freshwater linking the Atlantic Ocean to the continental interior. The Poe Lock is 1200 feet long, 110 feet wide, and 32 feet deep.

The waterway flows from west to east. Lake Superior drains into Lake Huron via the St. Mary’s River. On the Great Lakes Seaway system, 16 locks lift or lower ships a total of 600 feet from Montreal to Lake Superior. Completed in 1959, the canals and locks of the Montreal-Lake Ontario section of the St. Lawrence Seaway enable deep-draft navigation between Montreal and Lake Ontario.

The entire system flows to the Atlantic Ocean via the St. Lawrence River. Combined, these locks lift or lower ships 243 feet. There are two parallel locks operating at the Soo. The St. Lawrence Seaway allows navigable shipping from the GLW to the Atlantic Ocean, while the Illinois Waterway extends commercial shipping to the Mississippi River and the Gulf of Mexico. Major ports on the Great Lakes Waterway include Duluth-Superior, Chicago, Detroit, Cleveland, Twin Harbors, Hamilton and Thunder Bay. Locks and Channels. Though all of the lakes are naturally connected as a chain, water travel between the lakes was impeded for centuries by obstacles such as Niagara Falls and the rapids of the St. Marys River.

The link to MarineTraffic.com is provided for your convenience. The five Great Lakes form the heart of the waterway. Once the correct elevation is achieved, the opposite gate opens and the ship exits the chamber. Its principal civil engineering works are the Welland Canal between Lakes Ontario and Erie, and the huge Soo Locks between Huron and Superior. The 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. Lake Huron drains into Lake Erie via the St. Clair and Detroit Rivers. This section of the waterway features seven navigation locks – five in Canada and two in the United States. In a time before railroads and highways, the Great Lakes and St. Lawrence River served as the primary transportation system. The fifth, Lake Michigan, is entirely within the United States. The Great Lakes Waterway is co-administered by the governments of Canada and the United States of America.

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. While most of the waterway is naturally navigable, the St. Marys, the Niagara and the St. Lawrence rivers were not. Channels are marked with navigation buoys in constricted areas and pilots are required on foreign boats. This bi-national waterway has been a foundation of the region’s economy for more than 200 years. The waterway allows passage from the Atlantic Ocean to the inland port of Duluth on Lake Superior, a distance of 2,340 miles (3,770 km) and to Chicago, on Lake Michigan, at 2,250 miles (3,620 km).[1]. Recreational boats can use or cross the ship channels, but the large boats, with limited maneuverability, have right of way.

The MacArthur Lock is 800 feet long, 80 feet wide, and 29.5 feet deep. Today, Great Lakes-Seaway shipping is equally important. The five Great Lakes form the heart of the waterway.

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