ecodive.ca · Operator
Operator charter page showing the site as an advanced 75-foot dive.
Dive Spot Guide•
Mille Roche Power House
Mille Roche Power House: boat-only river wreck
Boat-only St. Lawrence structure dive with strong current, dark recesses and a historic industrial layout best handled by experienced divers.
About Mille Roche Power House
Mille Roche Power House is a submerged St. Lawrence River power-house site east of Cornwall, where the flooded structure, gates and remaining machinery create a serious freshwater wreck dive. It is a boat-accessed dive for experienced divers who want current, structure and a real sense of the Lost Villages history rather than a casual sightseeing stop.
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Research Estimate At Mille Roche Power House
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 4m
AccessChallenging entry effort
Aquatic LifeAverage variety
FacilitiesGood facilities
CurrentStrong current
SurgeFlat calm
Where Is Mille Roche Power House?
This spotNearby spotsExplore nearby spots on the map
Community sourced coordinates.
Mille Roche Power House Planning Details
Depth range, seasonality, and planning context.
Reported Depth
11m - 23m
Depth Note
The site is reported at about 35-75 ft, with intact mechanisms and turbines still in place.
Best Season
Late spring through early fall, with colder-water gear needed outside the warmer months.
Typical Conditions
Boat-accessed freshwater power-house site with submerged gates, turbines and canal remnants, plus current that can strengthen outside the sheltered sections.
Safety & Access At Mille Roche Power House
Hazards, restrictions, and access requirements.
Key Hazards
Cold waterOverhead environmentStrong current
Safety Notes
Advanced-diver only; bring a torch, stay conservative around dark recesses, and plan for current before you commit to the site.
Access Restrictions
Accessible only by boat and not recommended for penetration unless you have the right training and a conservative plan.
Legal Notes
No special permit is called out in the public listings; follow local boat-launch, mooring and river-navigation rules.
Local Intel For Mille Roche Power House
Community notes to help plan your visit.
Scuba Diving
Advanced river dive with submerged industrial structure, dark cut-throughs and current management that rewards disciplined buoyancy.
Freediving
Not a freedive site; the depth, current and structure make it a scuba-only plan.
Snorkeling
Not suited to casual snorkeling because the meaningful features are deep and current-exposed.
Wildlife at Mille Roche Power House
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Mille Roche Power House
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Mille Roche Power House
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility4m
Activity
No dive activity logged yet.
