Shotline Diving Wreck Profile
- Name: Louis Mario
- Type: Tugboat
- Year Built:
- Builder: Unknown
- Dimensions: Length: 50-82 ft (15-25 m); Beam; Depth of hold
- Registered Tonnage:
- Location: Estuary of Bad River and French River, ~18.3 m (60 ft) west of Isabel Shoal
- Official Number: Not available
- Original Owners: Unknown
- Number of Masts: Unknown
Wreck Location Map
Vessel Type
The Louis Mario was a tugboat operating in the northern reaches of Lake Huron, particularly around the French River delta. These waters have long been used for navigation—from Indigenous canoe trade routes to fur trading, logging, and modern commercial shipping. The vessel’s dimensions and specifications are unrecorded, but tugs of this type and era typically measured 15–25 m in length and were equipped for heavy towing and maneuvering duties in tight, hazard-prone channels.
Description
The Louis Mario was a tugboat operating in the northern reaches of Lake Huron, particularly around the French River delta. These waters have long been used for navigation—from Indigenous canoe trade routes to fur trading, logging, and modern commercial shipping. The vessel’s dimensions and specifications are unrecorded, but tugs of this type and era typically measured 15–25 m in length and were equipped for heavy towing and maneuvering duties in tight, hazard-prone channels.
History
Sparse historical records suggest the Louis Mario served in a local or regional capacity, likely supporting logging or construction operations along the French River waterway. The estuary and nearby Isabel Shoal have a documented history of groundings due to rocky shallows and shifting water levels. The vessel’s grounding west of the shoal may have resulted from navigational misjudgment, mechanical failure, or adverse weather.
Significant Incidents
The tug grounded approximately 60 feet west of Isabel Shoal in an area where submerged hazards are common. No casualties or salvage operations have been recorded. Given the lack of official registry or maritime board reports, the incident may have been handled informally at the local level, particularly if the vessel was refloated or dismantled on site.
Final Disposition
Unknown. No confirmed salvage or abandonment records exist. The vessel’s remains, if extant, have not been identified in sonar or diver surveys of the area.
Current Condition & Accessibility
No confirmed archaeological survey or rediscovery has been reported in available sources.
Resources & Links
[shotline_reference_links slug=”louis-mario” title=”References & Links”]
The grounding of the Louis Mario near Isabel Shoal is a minor but telling piece of Great Lakes maritime history, illustrating the hazards of the French River estuary. With no surviving registry data, images, or physical survey, the tug remains an undocumented casualty of the countless small workboats that supported regional industries and rarely entered the historical record.
Full Wreck Record — complete historical article, construction details, voyage logs, incident reports, dive conditions, and all research sources.
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