The Nordmeer is a wreck and artificial reef located in the Thunder Bay National Marine Sanctuary near Alpena. This freshwater site offers depths reaching 40 metres, with shallower sections accessible to beginners and deeper areas suited for advanced divers. Visibility typically ranges from 5 to 10 metres. The site features a mild current, though divers must navigate hazards including an overhead environment within the wreck, entanglement risks, and cold water temperatures. Access is by boat only, located 14484 metres from shore. Due to the cold environment, a drysuit or thick wetsuit with hood and gloves is essential. Always deploy a surface marker buoy before ascending to avoid boat traffic.

The Lucinda Van Valkenburg is a shipwreck located 3200 metres offshore in Thunder Bay, near Alpena. Resting at depths between 15 and 18 metres, the wreck is accessible only by boat. Divers experience mild currents and visibility ranging from 15 to 30 metres. Due to cold freshwater temperatures that remain near 3 to 4 degrees Celsius at the bottom, drysuit use is essential. The site is suited for intermediate divers, as the structure presents entanglement hazards in confined areas. Surface marker buoys are required for safe ascents due to local boat traffic. Guided tours are available through local dive shops to assist with navigation around the wreck.

Rockport Quarry is an abandoned limestone site featuring rocky underwater terrain and remnants of ancient dock pilings. Divers and snorkellers can explore this industrial site, which is now filled with water from Lake Huron. The site offers shore access with depths ranging from 2 to 18 metres. Conditions vary, with visibility typically between 5 and 15 metres and mild currents. Water temperatures fluctuate significantly throughout the year, ranging from 1 to 17 degrees Celsius. Hazards include cold water, potential entanglement, and boat traffic. Facilities available on-site include parking, toilets, showers, and a rinse station. The site is suitable for beginners, with typical dives lasting approximately 45 minutes.

The Monrovia is a freshwater wreck located 17.7 kilometres offshore from Alpena. Resting at depths between 43 and 60 metres, this site is suited for intermediate to advanced divers. Visibility varies significantly from 6 to 24 metres. Access is by boat only, and divers should expect mild currents. Due to the cold water temperatures ranging from 2 to 15 degrees Celsius, a drysuit is recommended. The wreck presents specific hazards including cold water and potential entanglement risks within the structure. Guided tours, air fills, and equipment rental are available locally to assist with planning and navigating the site safely.