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Ocean Vessel


Open companionway.
Open companionway.

GPS Location: N44° 59.020' W82° 55.380'
Depth: 140 Feet
Wreck Length: 447.6 Feet Beam: 56.2 Feet
Gross Tonnage: 7076 Cargo: Steel
Built: 1943 by Rankin and Blackmore in Port Glasgow, Scotland
Wrecked: June 25, 1959

Open hatch of machinery room.
Open hatch of machinery room.

Description: Despite improved charts, navigational aids, designated shipping lanes, radio telephones, and even radar, big ships still go down in the Great Lakes. Such was the case when the Liberian registered ocean freighter Monrovia was rammed by the freighter Royalton during a heavy fog just outside Thunder Bay. Monrovia went to the bottom in deep water. The wreck sits upright on the lake bottom and is largely intact except for the collision damage.


Thunder Bay National Marine Sanctuary: Enjoy diving the wrecks of Thunder Bay, but always respect the past. State and federal laws prohibit removing or disturbing artifacts. Future generations are depending on us to leave historic shipwrecks intact. Please take only pictures and leave only bubbles.

The Thunder Bay National Marine Sanctuary maintains seasonal moorings at many shipwreck sites. Available from May to September, the moorings make for safer diving and also protect shipwrecks from anchor damage. Sanctuary regulations require vessels to use moorings when present.

Marine Forecast

Forecast for the Alpena area


GPS Coordinates:
44.98367, -82.923
Phone: 989.356.8805
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