Customs handling and current.
Boat-access wreck dive on the St. Lawrence River
Boat-access wreck dive on the St. Lawrence River
SS Keystorm (Wreck) is a boat-accessed wreck dive on the U.S. side of the St. Lawrence River, known for its intact steel structure rather than reef life. The wreck spans a broad depth band and rewards steady buoyancy, line work, and wreck awareness more than casual sightseeing. Expect river current on the approach, a buoyed descent, and a site that can feel especially lively on night dives. Zebra mussels, fish, and other freshwater growth are part of the scene, while the wheelhouse and cargo sections keep this firmly in the scuba lane.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
6.1m - 35.1m
Depth Note
Guides place the bow in the low 20s ft and the deeper structure around 115 ft, with some references rounding the deepest points to 120 ft.
Best Season
Late spring through early fall
Typical Conditions
Clear freshwater conditions are common, especially later in summer, but river current can matter on the approach and ascent. Buoyed lines help keep the dive orderly.
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Watch for fishing line, overhead structure, and boat traffic on the approach.
Access Restrictions
Boat access only; cross-border departures may require passport and customs handling before diving U.S. waters.
Legal Notes
The wreck sits in U.S. waters near the Canada border. Canadian-side trips may need U.S. customs/immigration clearance before or after the dive.
Community notes to help plan your visit.
Scuba Diving
A buoyed wreck dive with a wide depth range, current on approach, and enough overhead structure that it suits wreck-trained scuba divers. Night dives can be rewarding.
Freediving
Not a practical freedive target. The wreck's depth spread and overhead structure make scuba the sensible choice.
Snorkeling
Not a snorkel-focused site. The interesting structure sits too deep for meaningful surface-only exploration.
Species commonly reported at this site, with direct links into their wildlife guides.
Community dive logs and visit reports for this site.
Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Customs handling and current.
Boat access and mooring buoy.
Depth span and site preservation.
Seasonal clarity and trip planning.
Visibility and regional wreck context.
Advanced wreck with buoyed descents and current.
Know this site? Improve Spot Details.

Keystorm is a historic St. Lawrence wreck with a broad profile.

Deep freshwater wreck with current, traffic and artifacts.

Bonnie Castle: shore-access river training dive park

Historic Islander (Wreck) with easy shore access.

Lise Cottage is a private freshwater dive site with clear water.