The St Lawrence Seaway system consists of locks, river canals and channels. It is part of both USA and Canada and permits ocean-going (large-sized) ships to navigate between the Atlantic Ocean to the Great Lakes, as far as Lake Superior.
- The St Lawrence River flows from Lake Ontario to the Atlantic Ocean.
- Saint Lawrence Seaway extends from Montreal to Lake Erie, including the Welland Canal. This section consists of several river channels, locks and canals along the banks of the river. They were constructed to bypass the river's rapids and dams along the route.
- Some the locks are managed by Canadian autorities ("Saint Lawrence Seaway Management Corp") and some by the USA ("Saint Lawrence Seaway Development Corp"). The Seaway is advertized as part of "Highway H2O".
- The river section downstream of Montreal is fully Canadian and regulated by Transport Canada (Port of Quebec).
- Great Lakes and St Lawrence Seaway shipping generates annually over USD 3,4 billion in revenue from shipping hundreds of million tons of cargo. Inbound shipments, include mostly steel (approx 6% of the USA's total). Outbound shipments include grain (approx 7% of the total cargo and approx 4% of the USA's overseas total grain shipments). The toll revenue from ocean-going ships is approx 30%.
- The Seaway locks match the Welland Canal's locks, permitting passages of ships with max length 740 ft (230 m) and max beam (width) 78 ft (24 m). There is a Seaway locks expansion project planned for 2030, that will allow box ships (container carriers) to navigate to the Great Lakes. The expanded Seaway's max height clearance is 150 ft (46 m) due to the river bridges' height restrictions (Mackinac, Ambassador, Blue Water, and Gordie Howe).. The new max water drought will be 36 ft (11 m), compared to the current max draft of 27 ft (8,2 m) now.
- Currently, Montreal port allows max drafts of 36 ft (11 m) in the St Lawrence River's estuary.
The St Lawrence Seaway cruise port map is interactive. It shows the port's exact location, along with the real-time cruise ship traffic (if any) in its vicinity - today, and right now. By zooming-out you can see other cruise ship ports located near St Lawrence Seaway, Ontario, Canada.
If you lose the St Lawrence Seaway location on the map, simply reload the page (also with F5 button). This feature is integrated with the CruiseMapper's cruise ship tracker tracking the vessels' current positions at sea and in ports.