Lock 21
About Lock 21
Lock 21 is a unique river dive featuring a submerged 19th-century Victorian canal lock, offering an underwater look at historic infrastructure on the St. Lawrence River. The main draw is the site’s historical character rather than abundant scenery. Currents can be strong, and the dive is best suited to experienced divers. Fish life commonly includes bass, trout, and catfish.
Where Is Lock 21?
Safety & Access At Lock 21
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Strong currents can be present; this site is best for experienced divers.
Local Intel For Lock 21
Community notes to help plan your visit.
Scuba
A historically focused scuba dive on a submerged canal lock; strong current makes it better suited to experienced divers.
Lock 21 Dive Conditions Planner
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Exposure Profile at Lock 21
Directional shelter context for incoming swell.
Recent Logged Visits At Lock 21
Community dive logs and visit reports for this site.
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Dive Spot Log Averages At Lock 21
Average conditions based on logged dives & visits.
Lock 21 Guide - Sources and Updates
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