Ports & Harbours of the Great Lakes and the St. Lawrence Seaway
YearMaps maps 202 harbours on the Great Lakes and the St. Lawrence Seaway, in 2 countries and territories. The largest by the World Port Index's harbour size are Buffalo, Cleveland, Manitowoc, Duluth, Milwaukee and Superior. 12 are written up in full below, and every harbour is listed with its depths, tidal range and the largest ships it takes.
The five Great Lakes hold about a fifth of the world's fresh surface water and form the largest inland shipping system on Earth. Since the St. Lawrence Seaway opened in 1959, ocean-going ships have been able to sail some 3,700 km from the Atlantic to the head of Lake Superior, though its locks limit them to about 225 m in length. The lake ports grew with the grain, iron ore, coal and steel trades of the nineteenth and twentieth centuries.
- Harbours
- 202
- Countries
- 2
- Large Harbours
- 2
- Written Up
- 12
Map of the Ports of the Great Lakes and the St. Lawrence Seaway
Blue dots are the harbours of the World Port Index; tap or click one to open its entry. Use the layer panel to add trade routes, rivers and historical borders.
Harbours of the Great Lakes and the St. Lawrence Seaway in Detail
The 12 harbours of the Great Lakes and the St. Lawrence Seaway with an encyclopedia article, each with its figures from the World Port Index.
Buffington
Medium harbour · United States
The Buffington Harbor is located on the shores of Gary, Indiana United States. It is home to restaurants, hotels, and two casino boats owned by Don Barden
Adapted from Wikipedia: Buffington Harbor (CC BY-SA 4.0).
- Harbour size
- Medium
- Channel depth
- 42.1 m
- Anchorage depth
- 42.1 m
- Cargo pier depth
- 42.1 m
- Largest vessel
- large vessels
- Country
- United States
- Coordinates
- 41.6300°, -87.4200°

Calumet Harbor
Medium harbour · United States
The Port of Chicago consists of several major port facilities on Lake Michigan within the city of Chicago, Illinois, operated by the Illinois International Port District (formerly known as the Chicago Regional Port District). It is a multimodal facility featuring Senator Dan Dougherty Harbor (Lake Calumet), the Iroquois Landing Lakefront Terminus, and Harborside International Golf Center. The central element of the Port District, Calumet Harbor, is maintained by the U.S. Army Corps of Engineers.
The modern Port of Chicago links inland canal and river systems in the Midwestern United States to the Great Lakes, giving the global shipping market access to the St. Lawrence Seaway and linking the Atlantic Ocean to the Gulf of Mexico by way of the Illinois Waterway and the Mississippi River.
Adapted from Wikipedia: Port of Chicago (CC BY-SA 4.0).
- Harbour size
- Medium
- Channel depth
- 42.1 m
- Anchorage depth
- 42.1 m
- Cargo pier depth
- 45.7 m
- Oil terminal depth
- 42.1 m
- Largest vessel
- large vessels
- Country
- United States
- Coordinates
- 41.7300°, -87.5200°
More about Calumet Harbor
History
In 1951, the Illinois General Assembly authorized the creation of port districts in Illinois with the Chicago Regional Port District, to oversee harbor and port development, being the first such port district created. The State of Illinois and City of Chicago had relinquished all rights and interest in the bed of Lake Calumet to the Port District, so as to enable the District to develop Calumet Harbor. The district was given the power to acquire any navigable waters of the state which were within the District area. The constitutionality of the district was challenged in People v. Chicago Regional Port District.
Sections adapted from Wikipedia: Port of Chicago (CC BY-SA 4.0).

Fairport
Small harbour · United States
Fairport Harbor is a village in Lake County, Ohio, United States, along Lake Erie at the mouth of the Grand River. The population was 3,108 at the 2020 census. A far-eastern suburb of Cleveland, it is part of the Cleveland metropolitan area.
Fairport Harbor is home to two lighthouses: the Fairport Harbor West Breakwater Light in Painesville Township, operated by the United States Coast Guard and the Fairport Harbor Light operated by the Fairport Harbor Historical Society. It is also the home of the Finnish Heritage Museum.
Adapted from Wikipedia: Fairport Harbor, Ohio (CC BY-SA 4.0).
- Harbour size
- Small
- Channel depth
- 49.4 m
- Anchorage depth
- 49.4 m
- Cargo pier depth
- 49.4 m
- Largest vessel
- medium vessels
- Country
- United States
- Coordinates
- 41.7700°, -81.3000°
More about Fairport
History
Fairport Harbor's location at the mouth of the Grand River made it an ideal place for a settlement. After being claimed as part of the Connecticut Western Reserve by the Connecticut Land Company in 1796–1797, the town of Grandon was platted there on May 16, 1812. When the town incorporated in 1836, the name was changed to "Fairport." Fairport is a commendatory name. The current name was adopted in 1959.
After receiving federal sponsorship, the village's port flourished, and an influx of Finns, Hungarians, and Slovaks arrived there. The port also imported iron ore for use at area steel mills. The port continues operation at a more limited capacity.
Later in the village's history, the Diamond Alkali Company operated from 1912 to 1976.
Sections adapted from Wikipedia: Fairport Harbor, Ohio (CC BY-SA 4.0).
Oswego
Small harbour · United States
The Port of Oswego is the main waterfront area of the City of Oswego in Oswego County, New York. Over the course of its history, the Port of Oswego has been the focus of military conflict and conquest, a site of record trade revenue, and a significant part in the History of American expansion and industrialism. Today the Port of Oswego is a shadow of its once-powerful self but still proves to be useful as trade continues in the central New York region.
Early explorers in the 17th century of Dutch, French, and English origin realized the value of an all-water route connecting the French settlements along the St. Lawrence River with the Dutch settlement of New Amsterdam. This would create a trade route that would stretch well over 500 miles (800 km) and give the controller of this route a significant advantage for turning profits in the New World. The Port of Oswego would become the focal point of this perceived route and bring the country that owns it almost infinite resources for constructing an empire in the New World.
Adapted from Wikipedia: Port of Oswego (CC BY-SA 4.0).
- Harbour size
- Small
- Channel depth
- 45.7 m
- Anchorage depth
- 45.7 m
- Cargo pier depth
- 45.7 m
- Largest vessel
- medium vessels
- Country
- United States
- Province
- New York
- Coordinates
- 43.4700°, -76.5200°
More about Oswego
History
The era of the fur trade saw the Port of Oswego change hands four different times. The port was controlled at the beginning of the era by the Dutch from 1610 until 1650, although there is a very minimal record as to what activity was taking place at the port while under Dutch control. The second major power to control the port during The Fur Trade Era was the French, who held control of the port from 1650 to 1700. The British were the next to have the Port of Oswego under their control, as they controlled it from 1700 until 1775. The port wasn't handed over to the United States until 1796 and since then has been under the jurisdiction of the United States.
Sections adapted from Wikipedia: Port of Oswego (CC BY-SA 4.0).

Port Colborne
Small harbour · Canada
Port Colborne is a city in Ontario, Canada that is located on Lake Erie, at the southern end of the Welland Canal, in the Niagara Region of Southern Ontario. The original settlement, known as Gravelly Bay, dates from 1832 and was renamed after Sir John Colborne, a British war hero and the Lieutenant Governor of Upper Canada at the time of the opening of the (new) southern terminus of the First Welland Canal in 1833. The city's population in 2021 was 20,033.
Adapted from Wikipedia: Port Colborne (CC BY-SA 4.0).
- Harbour size
- Small
- Channel depth
- 42.1 m
- Anchorage depth
- 5.5 m
- Cargo pier depth
- 42.1 m
- Oil terminal depth
- 42.1 m
- Largest vessel
- large vessels
- Country
- Canada
- Coordinates
- 42.8800°, -79.2500°
More about Port Colborne
History
In pre-colonial times, Indigenous people of the Onguiaahra (Neutral Iroquois) lived in the area, due in part to the ready availability of flint and chert from outcroppings on the Onondaga Escarpment. This advantage was diminished by the introduction of firearms by European traders, and they were driven out by the Six Nations of the Iroquois around 1650 as part of the Beaver Wars.
Originally called Gravelly Bay, after the shallow, bedrock-floored bay upon which it sits, today's City of Port Colborne traces its roots back to the United Empire Loyalist settlements that grew up in the area following the American Revolution. Growth became focused around the southern terminus of the Welland Canal after it reached Lake Erie in 1833.
Economy
Maritime commerce, including supplying goods to the camps for the labourers who worked on the first canal, ship repair and the provisioning trade, was, and still is, an important part of Port Colborne's economy. Like other cities in the region, Port Colborne was a heavily industrial city throughout most of the early 20th century because of its proximity to the hydroelectric power of Niagara Falls. A grain elevator, two modern flour mills, a nickel refinery, a cement plant operated by Canada Cement, and a blast furnace operated by Algoma Steel were all major employers.
As recently as 2017, Port Colborne has been successful attracting new industry, such as the agro-business operations of Casco Inc. and Jungbunzlauer, which process corn into products such as sweeteners and citric acid.
Sections adapted from Wikipedia: Port Colborne (CC BY-SA 4.0).

Port Credit
Very Small harbour · Canada
Port Credit is a neighbourhood in the south-central part of the City of Mississauga, Ontario, Canada, located at the mouth of the Credit River on the north shore of Lake Ontario. Its main intersection is Hurontario Street and Lakeshore Road, about 0.6 kilometres (0.37 mi) east of the river. Until 1974, Port Credit was an incorporated town. Its approximate boundaries are the Canadian National Railway to the north, Seneca Avenue to the east and Shawnmarr Road to the west. It had a population of 10,260 at the 2001 census.
Port Credit was originally a settlement of the Mississauga Ojibwe First Nations band and a trading post established in 1720 for the exchange of goods from the Europeans for furs trapped by the Mississaugas. After the War of 1812, a harbour was established by the Mississaugas together with European and Jamaican settlers. In 1847, the Mississaugas left the village to relocate on the Six Nations Reserve to be with other band members and first nations. Industry was established on the village periphery including an oil refinery, but the neighbourhood is no longer a substantial industrial district.
Adapted from Wikipedia: Port Credit (CC BY-SA 4.0).
- Harbour size
- Very Small
- Channel depth
- 56.7 m
- Anchorage depth
- 45.7 m
- Cargo pier depth
- 42.1 m
- Largest vessel
- large vessels
- Country
- Canada
- Coordinates
- 43.5500°, -79.5800°
More about Port Credit
History
The location of Port Credit was in the 1700s, the land of the Mississauga Ojibwe Indigenous people. The location became used as a meeting place between the band and white traders, and the river was known to them as the Missinhe or "trusting creek". To the French and later the English the mouth was known as "Port Credit" and a trading post was established in 1720, where goods were traded or bought on credit. The earliest reference is on a map drawn in 1757 by La Broquerie.
The first permanent structure built by the English at the site was the Government Inn (1798–1861), on the east bank of the river.
Tourism
The Port Credit In-Water Boat Show. An annual event, to be held in August, at the Port Credit Harbour Marina. Ontario's largest in-water boat show.
Southside Shuffle is an annual three-day Blues and Jazz festival in September, founded in 1999 by Chuck Jackson. It includes the Mississauga Music Walk of Fame.
The Marina is located in the center of Port Credit and provides docking for ships up to 45’ in length.
Lakefront Promenade Marina is located Lakefront Promenade park, built in 1991. It has amenities including docking and boating facilities as well as an outdoor eatery for convenience.
Alongside the protected harbour are 40 hectares of public land including a playground, splash pads, boardwalks, barbecues, and many more amenities.
Sections adapted from Wikipedia: Port Credit (CC BY-SA 4.0).

Port Dover
Very Small harbour · Canada
Port Dover is an unincorporated community and former town located in Norfolk County, Ontario, Canada, on the north shore of Lake Erie. It is the site of the recurring Friday the 13th motorcycle rally. Prior to the War of 1812, this community was known as Dover Mills.
Adapted from Wikipedia: Port Dover (CC BY-SA 4.0).
- Harbour size
- Very Small
- Channel depth
- 56.7 m
- Anchorage depth
- 56.7 m
- Cargo pier depth
- 56.7 m
- Largest vessel
- medium vessels
- Country
- Canada
- Coordinates
- 42.7800°, -80.2000°
More about Port Dover
History
Port Dover's earliest known inhabitants, from around the year 1000 until approximately 300–350 years later, were the Algonquin nation. They were noted flint-workers and evidence of their skill in crafting arrowheads is still to be found in open worked field areas surrounding the village. The next wave of inhabitants were the Attawandaron nation, the Neutrals, who occupied the region from about 1350 until their absorption by the Iroquois in the year 1651. The last significant native nation to occupy the area was the Mississaugas.
In 1670, French missionaries François Dollier de Casson and René Bréhant de Galinée became the first Europeans to winter at what is now Port Dover.
Climate
Port Dover traditionally belongs to the humid continental climate zone, even with the recent mild winters and warmer dry summers. From the late 1990s onwards, winters have become more mild due to changes in climate brought on by global warming.
The warmest summers that Port Dover has witnessed occurred in 1998, 2003, 2005, 2006, 2007, 2009 (with the exception of the month of July), 2010, 2012, 2013, 2014, 2015 and 2016.
Sections adapted from Wikipedia: Port Dover (CC BY-SA 4.0).
Port Wing
Very Small harbour · United States
Port Wing (also Portwing) is an unincorporated census-designated place in the town of Port Wing, Bayfield County, Wisconsin, United States. As of the 2020 census, Port Wing had a population of 156. The community is situated along Wisconsin Highway 13 and Bayfield County Highway A and is 30 miles (48 km) west of Bayfield. The Flag River enters Lake Superior at Port Wing's harbor.
Adapted from Wikipedia: Port Wing, Wisconsin (CC BY-SA 4.0).
- Harbour size
- Very Small
- Channel depth
- 56.7 m
- Anchorage depth
- 53 m
- Cargo pier depth
- 53 m
- Largest vessel
- medium vessels
- Country
- United States
- Coordinates
- 46.7800°, -91.3800°
Sackets Harbor
Very Small harbour · United States
Sackets Harbor (earlier spelled Sacketts Harbor) is a village in Jefferson County, New York, United States, on Lake Ontario. As of the 2020 census, Sackets Harbor had a population of 1,351. The village was named after land developer and owner Augustus Sackett, who founded it in the early 1800s.
Sackets Harbor is in the western part of the town of Hounsfield and is west of Watertown. The heart of the village, with a Main Street and well-preserved 19th century buildings, has been recognized as the Sackets Harbor Village Historic District and listed on the National Register of Historic Places in 1983.
To support the War of 1812, the US Navy built a major shipyard and its headquarters for the Great Lakes at the village. Within a short period, more than 3,000 men worked at the shipyard. The Army constructed earthworks, forts, barracks and supporting infrastructure to defend the village and navy shipyard, and its troops also camped in the village. The thousands of military personnel made it seem like a city. By the fall of 1814, this was the third-largest population center in the entire state, after Albany and New York City.
Adapted from Wikipedia: Sackets Harbor, New York (CC BY-SA 4.0).
- Harbour size
- Very Small
- Channel depth
- 56.7 m
- Anchorage depth
- 56.7 m
- Cargo pier depth
- 5.5 m
- Oil terminal depth
- 45.7 m
- Largest vessel
- medium vessels
- Country
- United States
- Coordinates
- 43.9500°, -76.1200°
More about Sackets Harbor
History
Prior to the American Revolutionary War, this area had been inhabited for thousands of years by differing cultures of indigenous peoples. The historic tribe were the Iroquoian-speaking Onondaga, part of the Haudenosaunee, or Iroquois Confederacy. Long trading with the French and English, the Mohawk and most of the Six Nations allied with the British during the Revolution, hoping to dislodge the American colonists from their territory. Following the war, they were forced to make major cessions of most of their land in New York to the United States. Most of the Iroquois went to Canada and settled on land granted by Great Britain.
Geography
Sackets Harbor is located at 43°56′47″N 76°7′4″W (43.946503, −76.117758).
According to the United States Census Bureau, the village has a total area of 2.2 square miles (5.7 km2), of which 0.004 square miles (0.01 km2), or 0.26%, are water. The village is on Black River Bay, southwest of the mouth of the Black River, on Lake Ontario. Its protected harbor was critical to the founding and early history of the village. Much of Lake Ontario was gouged out of rock by glaciers. There were few protected harbors on the south shore deep enough for major shipping in the early 19th century.
New York State Route 3 passes east of the village, which is at the convergence of County Roads 62 (Sulphur Springs Road) and 75 (Adams Road/Dodge Avenue).
Sections adapted from Wikipedia: Sackets Harbor, New York (CC BY-SA 4.0).
Sackets Harbor: Key Facts
| Established | 1801 |
|---|
Facts from Wikidata Q1973465 (CC0).

Copper Harbor
Very Small harbour · United States
Copper Harbor is an unincorporated community and census-designated place (CDP) located in Keweenaw County in the U.S. state of Michigan. It is located within Grant Township. The population of the CDP was 136 as of the 2020 census.
The community is located at the northern tip of the Keweenaw Peninsula and is the northernmost permanently populated community in the state. Due to its natural environment and surroundings, which include Fort Wilkins Historic State Park, Copper Harbor is marketed as an all-season tourist destination.
Adapted from Wikipedia: Copper Harbor, Michigan (CC BY-SA 4.0).
- Harbour size
- Very Small
- Channel depth
- 53 m
- Anchorage depth
- 49.4 m
- Cargo pier depth
- 53 m
- Largest vessel
- medium vessels
- Country
- United States
- Coordinates
- 47.4700°, -87.8700°
More about Copper Harbor
History
The Keweenaw Peninsula and the area that would become the Copper Country was home to the Ojibwe people prior to European settlement. By the 1842 Treaty of La Pointe, which took effect in 1843, the Ojibwe officially ceded the western Upper Peninsula including the Keweenaw to the United States.
Copper Harbor was host to the first mineral land agency throughout the entire Lake Superior District. Captain Walter Cunningham was appointed by the United States Department of War to act as a Special Agent to the area. As soon as wayfinding was established in the spring of 1843, Cunningham had come to the area and opened his office, which was thereafter named the "Government House". It was positioned on Porter's Island, a small rocky island just opposite of present-day downtown Copper Harbor.
Geography
In 2010, Copper Harbor was listed as a census-designated place. The CDP contains a total area of 2.43 square miles (6.29 km2), of which 1.51 square miles (3.91 km2) is land and 0.92 square miles (2.38 km2) (37.86%) is water.
Copper Harbor is located at the northern edge of the Keweenaw Peninsula, which also extends for several miles to the east. Copper Harbor has its own post office and ZIP Code (49918). Some areas within the community and the surrounding area may use the Mohawk 49950 ZIP Code.
Beyond the community center, there are thick forests, limited roadways, and few developments.
Relative to other communities in the Keweenaw, Copper Harbor is 9 miles (14.5 km) from Mandan, 12 miles (19.3 km) north of Delaware, and 16 miles (25.7 km) east of Eagle Harbor.
Sections adapted from Wikipedia: Copper Harbor, Michigan (CC BY-SA 4.0).
Monroe
Very Small harbour · United States
The Port of Monroe is Michigan's only port on Lake Erie.
Located in Monroe, Michigan, it handles a variety of cargo and is a growing hub for multimodal transportation in the region, which includes water, rail, and road transport.
The port is situated on the west shore of Lake Erie at the mouth of the River Raisin, and handles diverse cargo, including special bar quality (SBQ) steel, and has also focused on building supply chains for beneficial reuse materials.
The port has received federal grants to construct a new terminal to handle container shipments, which are the most common shipment form globally.
The Michigan Department of Environment, Great Lakes, and Energy awarded a $1 million Brownfield Redevelopment Grant to the Port to help redevelop its infrastructure with a second wharf and improve the turning basin.
The Port of Monroe was the first partner in the Newlab-Michigan Central testing network, a project that enables the rapid testing of new technologies for logistics in real-world conditions.
Adapted from Wikipedia: Port of Monroe (CC BY-SA 4.0).
- Harbour size
- Very Small
- Channel depth
- 49.4 m
- Anchorage depth
- 49.4 m
- Cargo pier depth
- 49.4 m
- Largest vessel
- large vessels
- Country
- United States
- Coordinates
- 41.8800°, -83.3300°

Port Dalhousie
Very Small harbour · Canada
Port Dalhousie is a community in St. Catharines, Ontario, Canada. Known for its waterfront appeal, it is home to the Royal Canadian Henley Regatta and is historically significant as the terminus for the first three (19th century) routes of the Welland Canal, built in 1820, 1845 and 1889.
Adapted from Wikipedia: Port Dalhousie (CC BY-SA 4.0).
- Harbour size
- Very Small
- Channel depth
- 49.4 m
- Anchorage depth
- 53 m
- Cargo pier depth
- 53 m
- Largest vessel
- medium vessels
- Country
- Canada
- Coordinates
- 43.2200°, -79.2700°
More about Port Dalhousie
History
Port Dalhousie was founded in 1826. The founding of Port Dalhousie was preceded by the development of the Welland Canal and the economic activity that it drew in the first half of the 19th century. While there was various small settlements in the area that went as far back as the 1790s, it was not until Nathan Pawling purchased several parcels of land to form a more formal community that he called “Port Dalhousie” after George Ramsay, 9th Earl of Dalhousie, then Governor-General of British North America. Following the purchase, Pawling placed an advertisement in the newspaper to attract new people to migrate to the community.
The opening of the Welland Canal created a boom in shipbuilding and repair. Alexander Muir and his brothers began the Muir Dry Dock in 1850.
Sections adapted from Wikipedia: Port Dalhousie (CC BY-SA 4.0).
All Harbours of the Great Lakes and the St. Lawrence Seaway
202 harbours, the largest first by the index's harbour size. Channel depth and tidal range set the physical limit on which ships can call. 41 of them are recorded in the source with the city they serve.
| Harbour | Country | Size | Channel | Anchorage | Tide | Largest vessel | Map |
|---|---|---|---|---|---|---|---|
| Buffalo | United States | Major | 42.1 m | — | — | large vessels | |
| Cleveland | United States | Major | 42.1 m | — | — | large vessels | |
| Manitowoc | United States | Medium | 49.4 m | 45.7 m | — | large vessels | |
| Duluth | United States | Medium | 45.7 m | — | — | large vessels | |
| Milwaukee | United States | Medium | 45.7 m | — | — | medium vessels | |
| Superior | United States | Medium | 45.7 m | — | — | large vessels | |
| Windsor | Canada | Medium | 45.7 m | — | — | medium vessels | |
| Buffington | United States | Medium | 42.1 m | 42.1 m | — | large vessels | |
| Calumet Harbor | United States | Medium | 42.1 m | 42.1 m | — | large vessels | |
| Chicago | United States | Medium | 42.1 m | — | — | large vessels | |
| Gary | United States | Medium | 42.1 m | — | — | large vessels | |
| Hamilton | Canada | Medium | 42.1 m | — | — | large vessels | |
| Indiana Harbor | United States | Medium | 42.1 m | 42.1 m | — | large vessels | |
| Toledo | United States | Medium | 42.1 m | — | — | large vessels | |
| Toronto | Canada | Medium | 42.1 m | — | — | large vessels | |
| Port Hope | Canada | Small | 56.7 m | 53 m | — | medium vessels | |
| Port Whitbyserves Oshawa | Canada | Small | 56.7 m | — | — | medium vessels | |
| White Lake | United States | Small | 56.7 m | 56.7 m | — | medium vessels | |
| Belleville | Canada | Small | 53 m | — | — | medium vessels | |
| Cobourg | Canada | Small | 53 m | 45.7 m | — | medium vessels | |
| Racine | United States | Small | 53 m | — | — | medium vessels | |
| Rondeau | Canada | Small | 53 m | 45.7 m | — | medium vessels | |
| Sheboygan | United States | Small | 53 m | — | — | medium vessels | |
| Tonawanda | United States | Small | 53 m | 53 m | — | medium vessels | |
| Trenton | Canada | Small | 53 m | 53 m | — | — | |
| Amherstburg | Canada | Small | 49.4 m | 45.7 m | — | medium vessels | |
| Fairport | United States | Small | 49.4 m | 49.4 m | — | medium vessels | |
| Grand Haven | United States | Small | 49.4 m | 49.4 m | — | medium vessels | |
| Menomineeserves Marinette | United States | Small | 49.4 m | — | — | medium vessels | |
| Ogdensburg | United States | Small | 49.4 m | 20.1 m | — | — | |
| Rochester | United States | Small | 49.4 m | — | — | medium vessels | |
| Sturgeon Bay | United States | Small | 49.4 m | 34.7 m | — | large vessels | |
| Waukegan | United States | Small | 49.4 m | — | — | medium vessels | |
| Alpena | United States | Small | 45.7 m | — | — | medium vessels | |
| Ashland | United States | Small | 45.7 m | 42.1 m | — | medium vessels | |
| Ashtabula | United States | Small | 45.7 m | 45.7 m | — | medium vessels | |
| Cheboygan | United States | Small | 45.7 m | 49.4 m | — | medium vessels | |
| Collingwood | Canada | Small | 45.7 m | — | — | medium vessels | |
| Conneaut | United States | Small | 45.7 m | 42.1 m | — | medium vessels | |
| Frankfort | United States | Small | 45.7 m | 45.7 m | — | medium vessels | |
| Goderich | Canada | Small | 45.7 m | 45.7 m | — | large vessels | |
| Green Bay | United States | Small | 45.7 m | — | — | medium vessels | |
| Holland | United States | Small | 45.7 m | 42.1 m | — | medium vessels | |
| Houghtonserves Hancock | United States | Small | 45.7 m | — | — | medium vessels | |
| Little Current | Canada | Small | 45.7 m | — | — | medium vessels | |
| Lorain | United States | Small | 45.7 m | 34.7 m | — | large vessels | |
| Manistee | United States | Small | 45.7 m | 20.1 m | — | medium vessels | |
| Midland | Canada | Small | 45.7 m | 45.7 m | — | medium vessels | |
| Oswego | United States | Small | 45.7 m | 45.7 m | — | medium vessels | |
| Owen Sound | Canada | Small | 45.7 m | — | — | large vessels | |
| Point Edwardserves Sarnia | Canada | Small | 45.7 m | — | — | large vessels | |
| Port Maitland | Canada | Small | 45.7 m | 38.4 m | — | medium vessels | |
| Port Washington | United States | Small | 45.7 m | 45.7 m | — | medium vessels | |
| Rouge Riverserves Detroit | United States | Small | 45.7 m | — | — | medium vessels | |
| Sandusky | United States | Small | 45.7 m | 45.7 m | — | medium vessels | |
| St Josephserves Benton Harbor | United States | Small | 45.7 m | — | — | medium vessels | |
| Two Harbors | United States | Small | 45.7 m | 42.1 m | — | large vessels | |
| Wyandotte | United States | Small | 45.7 m | 45.7 m | — | medium vessels | |
| Bay City | United States | Small | 42.1 m | — | — | medium vessels | |
| Erie | United States | Small | 42.1 m | — | — | large vessels | |
| Escanaba | United States | Small | 42.1 m | — | — | large vessels | |
| Huron | United States | Small | 42.1 m | 42.1 m | — | large vessels | |
| Lower Lakes Terminal | Canada | Small | 42.1 m | 34.7 m | — | — | |
| Ludington | United States | Small | 42.1 m | 42.1 m | — | — | |
| Muskegon | United States | Small | 42.1 m | — | — | medium vessels | |
| Parry Sound | Canada | Small | 42.1 m | — | — | large vessels | |
| Port Colborne | Canada | Small | 42.1 m | 5.5 m | — | large vessels | |
| Port Weller | Canada | Small | 42.1 m | 34.7 m | — | large vessels | |
| Saginaw | United States | Small | 42.1 m | — | — | medium vessels | |
| Sault Ste Marieserves Sault Ste. Marie | United States | Small | 42.1 m | — | — | medium vessels | |
| Thorold | Canada | Small | 42.1 m | — | — | large vessels | |
| Welland | Canada | Small | 42.1 m | — | — | large vessels | |
| Michigan City | United States | Small | — | — | — | medium vessels | |
| Algoma | United States | Very Small | 56.7 m | 42.1 m | — | medium vessels | |
| Bayfield | United States | Very Small | 56.7 m | 31.1 m | — | medium vessels | |
| Blind River | Canada | Very Small | 56.7 m | 49.4 m | — | medium vessels | |
| Bronte | Canada | Very Small | 56.7 m | 53 m | — | medium vessels | |
| Carillon | Canada | Very Small | 56.7 m | 38.4 m | — | — | |
| Chute A Blondeau | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Cornucopia | United States | Very Small | 56.7 m | 53 m | — | medium vessels | |
| Cumberland | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Desbarats | Canada | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Dunkirk | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Fassett | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Goulais Bay | Canada | Very Small | 56.7 m | 20.1 m | — | medium vessels | |
| Grenville | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Hawkesbury | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Kaukauna | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Kenosha | United States | Very Small | 56.7 m | 23.8 m | — | medium vessels | |
| Kewaunee | United States | Very Small | 56.7 m | 38.4 m | — | medium vessels | |
| Kingsville | Canada | Very Small | 56.7 m | 53 m | — | medium vessels | |
| la Pointe | United States | Very Small | 56.7 m | 31.1 m | — | medium vessels | |
| Manistique | United States | Very Small | 56.7 m | 31.1 m | — | medium vessels | |
| Masson | Canada | Very Small | 56.7 m | 38.4 m | — | — | |
| Montebello | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Oakville | Canada | Very Small | 56.7 m | 53 m | — | medium vessels | |
| Oconto | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Papineauville | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Picton | Canada | Very Small | 56.7 m | 53 m | — | medium vessels | |
| Port Clinton | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Port Credit | Canada | Very Small | 56.7 m | 45.7 m | — | large vessels | |
| Port Dover | Canada | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Port Hope | United States | Very Small | 56.7 m | 38.4 m | — | large vessels | |
| Port Severn | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Port Wing | United States | Very Small | 56.7 m | 53 m | — | medium vessels | |
| Put In Bay | United States | Very Small | 56.7 m | 42.1 m | — | medium vessels | |
| Rockland | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Rogers City | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Sackets Harbor | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Saugatuck | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Southampton | Canada | Very Small | 56.7 m | 53 m | — | medium vessels | |
| St Clair | United States | Very Small | 56.7 m | 49.4 m | — | medium vessels | |
| Thurso | Canada | Very Small | 56.7 m | 56.7 m | — | — | |
| Two Rivers | United States | Very Small | 56.7 m | 31.1 m | — | medium vessels | |
| Vermilion | United States | Very Small | 56.7 m | 56.7 m | — | medium vessels | |
| Alexandria Bay | United States | Very Small | 53 m | 53 m | — | medium vessels | |
| Cockburn | Canada | Very Small | 53 m | 31.1 m | — | medium vessels | |
| Copper Harbor | United States | Very Small | 53 m | 49.4 m | — | medium vessels | |
| Gananoque | Canada | Very Small | 53 m | 45.7 m | — | — | |
| Gargantua | Canada | Very Small | 53 m | 31.1 m | — | medium vessels | |
| Grand Marais | United States | Very Small | 53 m | 45.7 m | — | medium vessels | |
| Grand Marais | United States | Very Small | 53 m | 49.4 m | — | medium vessels | |
| Hilton | Canada | Very Small | 53 m | 38.4 m | — | medium vessels | |
| Leland | United States | Very Small | 53 m | 56.7 m | — | medium vessels | |
| Lions Head | Canada | Very Small | 53 m | 53 m | — | medium vessels | |
| Meaford | Canada | Very Small | 53 m | 38.4 m | — | — | |
| Millhaven | Canada | Very Small | 53 m | 53 m | — | — | |
| Nahma | United States | Very Small | 53 m | 49.4 m | — | medium vessels | |
| Pelee I North Wharf | Canada | Very Small | 53 m | 49.4 m | — | medium vessels | |
| Pelee I West Dock | Canada | Very Small | 53 m | 49.4 m | — | medium vessels | |
| Petoskey | United States | Very Small | 53 m | — | — | medium vessels | |
| Port Elgin | Canada | Very Small | 53 m | 53 m | — | medium vessels | |
| Rockport | Canada | Very Small | 53 m | 34.7 m | — | — | |
| Sodus Bay | United States | Very Small | 53 m | 53 m | — | — | |
| South Haven | United States | Very Small | 53 m | 53 m | — | medium vessels | |
| St. James Harbor | United States | Very Small | 53 m | 38.4 m | — | medium vessels | |
| Thornbury | Canada | Very Small | 53 m | 53 m | — | medium vessels | |
| Victoria Harbour | Canada | Very Small | 53 m | 53 m | — | — | |
| Wiarton | Canada | Very Small | 53 m | — | — | medium vessels | |
| Youngstown | United States | Very Small | 53 m | 53 m | — | medium vessels | |
| Alabaster | United States | Very Small | 49.4 m | 42.1 m | — | medium vessels | |
| Baraga | United States | Very Small | 49.4 m | 49.4 m | — | medium vessels | |
| Bruce Mines | Canada | Very Small | 49.4 m | 49.4 m | — | medium vessels | |
| Byng Inlet | Canada | Very Small | 49.4 m | 53 m | — | medium vessels | |
| Charlevoix | United States | Very Small | 49.4 m | 31.1 m | — | medium vessels | |
| Eagle Harbor | United States | Very Small | 49.4 m | 53 m | — | medium vessels | |
| Gore Bay | Canada | Very Small | 49.4 m | 20.1 m | — | medium vessels | |
| Key Harbour | Canada | Very Small | 49.4 m | 45.7 m | — | medium vessels | |
| Killarney | Canada | Very Small | 49.4 m | 56.7 m | — | medium vessels | |
| L Anse | United States | Very Small | 49.4 m | 49.4 m | — | medium vessels | |
| Leamington | Canada | Very Small | 49.4 m | 42.1 m | — | medium vessels | |
| Mackinaw City | United States | Very Small | 49.4 m | 49.4 m | — | medium vessels | |
| Monroe | United States | Very Small | 49.4 m | 49.4 m | — | large vessels | |
| Munising | United States | Very Small | 49.4 m | 45.7 m | — | medium vessels | |
| Niagaraserves Niagara Falls | United States | Very Small | 49.4 m | — | — | medium vessels | |
| Ontonagon | United States | Very Small | 49.4 m | 45.7 m | — | medium vessels | |
| Penetanguishene | Canada | Very Small | 49.4 m | 38.4 m | — | medium vessels | |
| Port Dalhousie | Canada | Very Small | 49.4 m | 53 m | — | medium vessels | |
| Port Stanley | Canada | Very Small | 49.4 m | 45.7 m | — | medium vessels | |
| Quebec Harbour | Canada | Very Small | 49.4 m | 34.7 m | — | medium vessels | |
| Washington Harbor | United States | Very Small | 49.4 m | 42.1 m | — | medium vessels | |
| Waubaushene | Canada | Very Small | 49.4 m | 49.4 m | — | medium vessels | |
| Algonac | United States | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| Batchawana Bay | Canada | Very Small | 45.7 m | 38.4 m | — | medium vessels | |
| Calcite | United States | Very Small | 45.7 m | — | — | large vessels | |
| Clarkson | Canada | Very Small | 45.7 m | 34.7 m | — | large vessels | |
| Clayton | United States | Very Small | 45.7 m | 34.7 m | — | medium vessels | |
| Courtright | Canada | Very Small | 45.7 m | 45.7 m | — | medium vessels | |
| Depere | United States | Very Small | 45.7 m | 45.7 m | — | medium vessels | |
| Gladstone | United States | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| Harbor Beach | United States | Very Small | 45.7 m | 45.7 m | — | medium vessels | |
| Heron Bay | Canada | Very Small | 45.7 m | 34.7 m | — | medium vessels | |
| Honora | Canada | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| Kagawong | Canada | Very Small | 45.7 m | 34.7 m | — | — | |
| Manitowaning | Canada | Very Small | 45.7 m | 49.4 m | — | medium vessels | |
| Meldrum Bay | Canada | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| Michipicoten | Canada | Very Small | 45.7 m | 34.7 m | — | medium vessels | |
| Port Mcnicoll | Canada | Very Small | 45.7 m | 45.7 m | — | medium vessels | |
| Queenston | Canada | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| Richards Landing | Canada | Very Small | 45.7 m | 45.7 m | — | medium vessels | |
| Rockport | United States | Very Small | 45.7 m | 38.4 m | — | medium vessels | |
| Sombra | Canada | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| St Ignace | United States | Very Small | 45.7 m | 34.7 m | — | medium vessels | |
| Tiffin | Canada | Very Small | 45.7 m | 45.7 m | — | medium vessels | |
| Tobermory | Canada | Very Small | 45.7 m | 31.1 m | — | medium vessels | |
| Traverse City | United States | Very Small | 45.7 m | — | — | medium vessels | |
| Walpole Island | Canada | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| Washburn | United States | Very Small | 45.7 m | 42.1 m | — | medium vessels | |
| Chaumont | United States | Very Small | 42.1 m | 49.4 m | — | medium vessels | |
| Cornwall | Canada | Very Small | 42.1 m | — | — | medium vessels | |
| Mackinac Island | United States | Very Small | 42.1 m | 42.1 m | — | medium vessels | |
| Port Inland | United States | Very Small | 42.1 m | 42.1 m | — | large vessels | |
| Presque Isleserves Marquette | United States | Very Small | 42.1 m | — | — | medium vessels | |
| Thessalon | Canada | Very Small | 42.1 m | — | — | medium vessels | |
| Trenton | United States | Very Small | 42.1 m | 42.1 m | — | medium vessels | |
| Marine City | United States | Very Small | 38.4 m | 38.4 m | — | large vessels | |
| St Catherine | Canada | Very Small | 38.4 m | 38.4 m | — | large vessels | |
| Au Sable | United States | Very Small | — | 49.4 m | — | medium vessels | |
| Cardinal | Canada | Very Small | — | — | — | — | |
| Oscoda | United States | Very Small | — | 49.4 m | — | medium vessels | |
| Tawas City | United States | Very Small | — | 45.7 m | — | medium vessels | |
| Wilmetteserves Evanston | United States | Very Small | — | — | — | medium vessels |
Port Cities of the Great Lakes and the St. Lawrence Seaway
The most populous cities with a harbour of the Great Lakes and the St. Lawrence Seaway within 25 km. Each city is listed with its country's other cities on the country page.
- Chicago8.99 million
United States of America · Calumet Harbor (22 km), Chicago, Wilmette (24 km)
- Toronto5.21 million
Canada · Toronto, Port Credit (21 km)
- Detroit4.10 million
United States of America · Windsor (4 km), Rouge River, Wyandotte (16 km), Trenton (24 km)
- Cleveland1.89 million
United States of America · Cleveland
- Milwaukee1.39 million
United States of America · Milwaukee
- Ottawa1.15 million
Capital of Canada · Masson (25 km)
- Buffalo1.02 million
- Rochester755,000
United States of America · Rochester
- Hamilton721,053
Canada · Hamilton, Thorold (21 km), Bronte (19 km), Oakville (24 km)
- Gary591,180
United States of America · Buffington (9 km), Calumet Harbor (23 km), Gary, Indiana Harbor (13 km)
- Toledo469,924
United States of America · Toledo
- Oshawa450,963
Canada · Port Whitby
- Evanston350,000
- Windsor319,246
Canada · Windsor, Rouge River (4 km), Wyandotte (18 km), Trenton (25 km)
- Appleton203,665
United States of America · Kaukauna (10 km)
- Waukegan200,000
- Green Bay198,611
- Erie178,182
United States of America · Erie
- Niagara Falls153,134
United States of America · Tonawanda (15 km), Port Weller (21 km), Welland (20 km), Youngstown (17 km)
- Sarnia144,172
Canada · Point Edward, St Clair (18 km), Courtright (17 km)
- Racine131,654
- Saginaw121,379
- Kingston114,195
Canada · Millhaven (20 km)
- Muskegon101,177
United States of America · White Lake (18 km), Grand Haven (18 km), Muskegon
- Duluth84,800
- Sault Ste. Marie83,805
United States of America · Sault Ste Marie
- Bay City68,549
- Benton Harbor58,382
United States of America · St Joseph
- Sheboygan53,705
United States of America · Sheboygan
- Cornwall48,821
Canada · Cornwall
Countries with Harbours on the Great Lakes and the St. Lawrence Seaway
More Seas and Coasts
- Ports of Atlantic Canada & Gulf of St. Lawrence
- Ports of Atlantic Coast of the United States
- Ports of Gulf of Mexico
- Ports of Caribbean Sea
- Ports of Pacific Coast of North & Central America
- Ports of Alaska, British Columbia & Bering Sea
- Ports of Arctic Canada, Hudson Bay & Greenland
See every sea, grouped from North America to Oceania & Antarctica, on the world ports index, or the voyages that crossed these waters on the famous sea voyages map.
Great Lakes & St. Lawrence Seaway: Quick Answers
- How many ports are there on the Great Lakes and the St. Lawrence Seaway?
- YearMaps lists 202 ports and harbours on the Great Lakes and the St. Lawrence Seaway, from the World Port Index of the US National Geospatial-Intelligence Agency. Small fishing harbours and private terminals outside the index are not counted.
- Which countries have ports on the Great Lakes and the St. Lawrence Seaway?
- United States (112) and Canada (90).
- What are the largest ports on the Great Lakes and the St. Lawrence Seaway?
- By the World Port Index's harbour size, the largest are Buffalo, Cleveland, Manitowoc, Duluth, Milwaukee and Superior.
- What are the main port cities on the Great Lakes and the St. Lawrence Seaway?
- The most populous cities with a harbour here are Chicago (8.99 million), Toronto (5.21 million), Detroit (4.10 million), Cleveland (1.89 million) and Milwaukee (1.39 million).