

Best for advanced divers, shore & boat entry, strong current.
Lock 20 is a submerged historical site located on the Montreal South Shore, created following the expansion of the St Lawrence Seaway in 1958. Divers can explore the remains of the lock structure, which was submerged alongside other infrastructure including roadways and canals during the seaway development. This site is intended for advanced divers due to the strong currents present in the area. Visibility is variable and typically ranges between 1 and 5 metres. Access to the site is possible via both shore and boat entries. As an industrial underwater site, it offers a unique perspective on the region's maritime history.
45.20010, -74.33250
Expected in this region. No sightings logged here yet.
Visibility
Up to 5m
Skill Level
Advanced
Entry
Shore & Boat
Water Temp
-1-23°C
Current
Strong
No, this site is intended for advanced divers due to the strong currents.
Access to Lock 20 is available via both shore and boat entries.
Visibility at this site is variable and generally ranges between 1 and 5 metres.
A drysuit recommended is recommended for diving at Lock 20 in Saint-Zotique. Water temperatures range from -1°C to 23°C.