GPS Location: N45° 01.996' W83° 11.988'
Depth: 18 Feet
Wreck Length: 160 Feet Beam: 30 Feet
Gross Tonnage: 572 Cargo: Coal
Launched: 1872 by Linn and Craig at Gibraltar, Michigan
Wrecked: November 23, 1907
Description: Built as the double-decked bulk freighter Ira H. Owen, the ship was rechristened Monohansett in 1882. Ten years later, it was rebuilt as a single-decked lumber carrier. On November 23, 1907, the ship burned to the water's edge at Thunder Bay Island. Most of the crew lost their personal belongings and some suffered minor burns, but there was no loss of life because the ship was near the island's Life Saving Station. Today, the Monohansett's wreck lies in three sections. The stern portion has hull features, propeller, and shaft all in place, and the boiler is nearby. 

After the ship was cut down to a steam barge.
After the ship was cut down to a steam barge.

Link to historical information on this ship.


Four-bladed steel propeller.
Four-bladed steel propeller.

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


Things To Do

Scuba Diving or Snorkeling