Montreal → Lake Ontario · Connected to Welland
A freighter slips between concrete walls. The gates close, the water rises, and an ocean-going ship takes another step inland. Find recent ship reports, choose a public place to watch, and explore the engineering that makes the journey possible.
The Seaway ship watch
Positions received in the last 30 minutes. A ship report is a glimpse of its journey, not a lock appointment.
Opening the river map. The ship list and viewing plans also work without map tiles.
Tap a numbered lock, a viewing marker or a ship to explore its story. Lock dots are approximate landmarks, not visitor entrances.
Alexandria Bay, New York, and Brockville, Ontario. These cameras do not show Eisenhower Lock or any lock chamber.
Choose a camera to watch.
If the video won’t play, open it on YouTube.
Freshness and coverage vary along the river. We do not infer lock occupancy, queue order or arrival times from AIS. Times are Eastern. For shore viewing; not for navigation.
A place to watch
Watch the chamber from the public observation decks, then step inside for exhibits and a ship-handling simulator. Leave room in your visit for a ship to arrive; the river keeps its own timetable.
76 Barnhart Island Road, Massena. Free admission. The operator currently lists 9 a.m.–5 p.m.; daily Memorial Day–Labor Day, Wednesday–Sunday outside peak season. Confirm current access before setting out.
The water does the lifting
Choose a lock, then follow the gates, water and ship. The sequence is accelerated and schematic; real dimensions, operating steps and water levels vary.
1 · Enter the chamber at the starting water level.
Gates can open only after water levels on both sides match. Iroquois uses an illustrative 1.2 m adjustment here; its actual difference varies. Seaway reference booklet ↗
Follow the seven locks from Montreal toward Lake Ontario. This chart adds the reference lift at each chamber; it is not a water-surface elevation profile. River gradients are omitted and the horizontal steps are equally spaced.
Choose a step to explore that lock.
| Lock | Reference lift | Kind |
|---|---|---|
| Saint-Lambert | 4.5 m | Lift lock |
| Côte-Sainte-Catherine | 9.1 m | Lift lock |
| Lower Beauharnois | 12.5 m | Lift lock |
| Upper Beauharnois | 12.5 m | Lift lock |
| Bertrand H. Snell | 13.7 m | Lift lock |
| Dwight D. Eisenhower | 11.6 m | Lift lock |
| Iroquois | Variable · example 1.2 m | Control lock |
An exercise in scale
The reference chamber is 233.5 m long and 24.4 m wide. Change the example ship, or use complete dimensions from a selected AIS report.
Illustrative ship dimensions. Not a selected ship or a clearance approval.
8.0 m of total reference length and 0.6 m of total width remain.
Total differences, not clearance on either side. This comparison does not establish draft, air draft, mooring requirements or permission to transit.
Choose the experience, then check the traffic
Observation decks, exhibits and a working lock make this the first detailed stop in our Seaway guide. A ship passing through becomes a lesson in scale, water and patience.
Plan an Eisenhower Lock visit →South Dundas documents green space, parking and ship watching beside the control lock. Expect a river landscape and a comparatively small, variable water-level adjustment.
The Thousand Islands, Montreal and Beauharnois are available as ship-report regions. Public viewing inventory is still being verified there; a ship or lock marker does not establish shore access.
Look beyond a single afternoon
These official BTS/GLS monthly records put the live map in seasonal context. They describe the published Seaway performance series, not counts at this selected lock, unique ships, or the number you will see during a visit.
Choose a month for its reported value.
Historical snapshot retrieved October 23, 2026. Missing values stay unreported, not zero. We use reviewed 2022–2024 monthly records; later source entries mix reporting dates and are not silently aggregated into this chart. BTS source data ↗
| Month · 2024 | Commercial vessel transits |
|---|---|
| January | Not reported |
| February | Not reported |
| March | Not reported |
| April | 226 |
| May | 252 |
| June | 230 |
| July | 204 |
| August | 224 |
| September | 238 |
| October | 279 |
| November | 274 |
| December | 290 |
Before you go
Shipping seasons, visitor hours and navigation operations have different clocks. Check the current notice and the selected lock's official order of turn before building a day around a ship.
The next chapter inland
Welland carries ships between Lake Ontario and Lake Erie through eight more locks. Continue into your existing canal guide for its ship map, lock stories and public viewing spots.
Explore Welland Canal →Soo LocksDuluth ship watchingFreighter CentralEisenhower Lock visiting guide
A little river knowledge
Use the regional map for recently received public AIS positions and the official Seaway map and vessel-transit information for source context. Our live reports cover selected areas from Montreal toward Lake Ontario, not the entire Atlantic-to-Great-Lakes waterway.
There are seven between Montreal and Lake Ontario and eight in the Welland Canal. Welland connects Lake Ontario and Lake Erie. The Soo Locks provide the separate connection toward Lake Superior.
Eisenhower Lock in Massena has an official Seaway Visitor Center and observation decks. Iroquois Point is another documented public ship-watching location. Confirm access and current traffic before traveling.
No. A receiver gap, an older position or a source problem can leave the map without fresh reports. Use the official Seaway vessel-transit information and keep the report timestamps in view.
Open Waters supplies recent public AIS reports from multiple contributors. We screen position ages, deduplicate ship identities and show received reports in five researched areas. Receiver coverage is not a complete traffic census. Official queue information remains at the Seaway source. The models are educational; the charts use dated historical records. Reference and access research reviewed October 23, 2026.
Lock reference and engineering context ↗ · Open Waters source information ↗ · About Chris Izworski