

Best for intermediate divers, 21-30m, boat entry, mild current.
The Mary Alice B is a shipwreck located in the Great Lakes and Northeast region, resting at depths between 21 and 30 metres with an average of 28 metres. Accessible only by boat, this site features mild currents and visibility ranging from 7 to 15 metres. Divers should be prepared for cold water temperatures, which fluctuate between 1 and 17 degrees Celsius throughout the year. Due to the significant depth, potential for entanglement, and overhead environment within the wreck, this site is suited for intermediate divers. Proper thermal protection is essential, and carrying a torch is recommended to explore the dark interior of the structure.
43.37182, -82.43835
The highlight of the dive is the intact wheelhouse with the wheel still mounted on its pedestal.
The site is located about 6 miles out from Port Sanilac, Michigan.
Expected in this region. No sightings logged here yet.
Depth
21-30m
Visibility
7-15m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
1-17°C
Current
Mild
Typical Dive
40 min
Best Time
Jun, Jul, Aug, Sep
The wreck sits at a depth of 21 to 30 metres, with an average depth of 28 metres.
No, this site is rated for intermediate divers due to the significant depth, cold water, and overhead environment.
The site is located 12,875 metres from shore and requires a boat charter for access.
Hazards include cold water, significant depth, entanglement risks from wreck structures, and the overhead environment.
No, this is a deep wreck dive site requiring boat access and intermediate diving skills.
Diving at Mary Alice B in Port Sanilac requires the following certifications: Open Water, Advanced. Always dive within your training limits.
A drysuit recommended is recommended for diving at Mary Alice B in Port Sanilac. Water temperatures range from 1°C to 17°C.
The best months to visit Mary Alice B in Port Sanilac are June, July, August, and September. Conditions outside these months can still be good but are less predictable.
Mary Alice B in Port Sanilac typically has mild currents that most divers can handle comfortably.
Visibility at Mary Alice B in Port Sanilac typically ranges from 7 metres to 15 metres. Conditions vary with weather, tides, and seasons.