Great Lakes Waterway

The Soo Locks between Lake Superior and the St. Marys River

The Great Lakes Waterway is a system of natural channels and canals which enable navigation between the North American Great Lakes. 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.

Its principal civil engineering works are the Welland Canal between Lakes Ontario and Erie, and the huge Soo Locks between Huron and Superior. Dredged channels were constructed in the St. Marys River, the Detroit River, Lake St. Clair and the St. Clair River between Huron and Erie. 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. The Great Lakes Waterway is co-administered by the governments of Canada and the United States of America.

Description

The shipping channels pass on opposite sides of Neebish Island

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]

Together with the Saint Lawrence Seaway, the Waterway allows both ocean-going vessels and the ore and coal-bearing lake freighters to travel from the system's saltwater outlet to its far interior. 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 the canal by larger ocean vessels. 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.

Shipping channels separate upbound traffic from downbound traffic. The upbound direction is away from the St. Lawrence River (westerly or northerly except in Lake Michigan where upbound is southerly). Channels are marked with navigation buoys in constricted areas and pilots are required on foreign boats. Recreational boats can use or cross the ship channels, but the large boats, with limited maneuverability, have right of way.

Map

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.

See also

• Straits of Mackinac

References

External links

• The Great Waterway, South Ontario tourism site

Great Lakes of North America
Main lakes	Erie Huron Michigan Ontario Superior
Secondary lakes	Nipigon Nipissing St. Clair Simcoe Winnebago
Bays and Waterways	Detroit River Erie Canal French River Georgian Bay Great Lakes Waterway Green Bay Lake George Lake Kagawong Lake Manitou Lake Nicolet Manitou Passage Lake Mindemoya Munuscong Lake Niagara River Nipigon River North Channel Potagannissing Bay St. Clair River Saint Lawrence River Saint Lawrence Seaway St. Marys River Sault Ste. Marie Canal Soo Locks Straits of Mackinac Trent–Severn Waterway Welland Canal
Islands	Detroit River Michigan (state) (in Lake Huron, part of Isle Royale National Park) Ontario
Historic geology	Lake Agassiz Lake Chicago Lake Maumee Mackinac Falls Midcontinent Rift System Niagara Escarpment Wisconsin glaciation
Government	Conference of Great Lakes and St. Lawrence Governors and Premiers Great Lakes Commission Great Lakes Fishery Commission International Joint Commission
Related topics	Basin Bays of the Great Lakes Great Lakes region Great Lake ships Lake-effect snow Lake Michigan–Huron Marine protected areas Megalopolis Native American tribes (US) Quebec City–Windsor Corridor Settlements Great Lakes museum and historic ships Lake freighter Tall ships Great Lakes Areas of Concern Great Lakes Treaties