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.
Legacy Notes & Full Historical Record
This section preserves the original unedited Shotline content for this wreck so that no historical detail is lost as we transition to the new logbook format.
Identification Card
Name: Louis Mario
Former Names: None known
Registration Number(s): Not available
Date Built & Launched: Unknown
Builder: Unknown
Measurements: Not available (typical tugs of era: 15–25 m / 50–82 ft length)
Hull Material: Presumed wood or steel
Propulsion: Steam or diesel screw (exact type unknown)
Date Lost: Unknown (grounding incident, date unrecorded)
Cause of Loss: Grounded
Location: Estuary of Bad River and French River, ~18.3 m (60 ft) west of Isabel Shoal
Crew at Loss: Unknown
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.
Final Voyage
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.
Located By & Date Found
No confirmed archaeological survey or rediscovery has been reported in available sources.
NOTMARs & Advisories
None specific to the Louis Mario. Isabel Shoal remains a charted navigational hazard.
Resources & Links
- Great Lakes Vessels Online Index – BGSU (no listing for Louis Mario)
- Maritime History of the Great Lakes (no listing for Louis Mario)
- Save Ontario Shipwrecks (no listing for Louis Mario)
- Ontario Ministry of Transportation archives (possible incident records)
Conclusion
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.
louis-mario 1999-12-31 21:38:00