Lock 20
About Lock 20
This dive site is connected to the creation of the St. Lawrence Seaway in 1958, when the channel was deepened to accommodate larger ships traveling to the Great Lakes. As a result, submerged infrastructure such as villages, roads, locks, power houses, and canals can be explored underwater by divers.
Where Is Lock 20?
Lock 20 Planning Details
Depth range, seasonality, and planning context.
Depth Note
The Seaway depth was increased to allow larger ships, and submerged structures may be visible to divers.
Local Intel For Lock 20
Community notes to help plan your visit.
Scuba
Diving can include underwater exploration of submerged man-made structures created by the Seaway project.
Lock 20 Dive Conditions Planner
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Lock 20.
Exposure Profile at Lock 20
Directional shelter context for incoming swell.
Recent Logged Visits At Lock 20
Community dive logs and visit reports for this site.
No Dive Logs Yet
Be the first to log a dive at this spot and share your experience!
Dive Spot Log Averages At Lock 20
Average conditions based on logged dives & visits.
Lock 20 Guide - Sources and Updates
Last Updated
Know this site? Improve Spot Details.
