Site NameMille Roche Power House

  • Location:

    East of Cornwall, near Guidon Park / N45°1'18.0012" W74°49'51.6"

  • Site ID:


  • Organization:

    SOS Ottawa

  • Record Date:

    May 30,2003

  • Wreck Type:

  • Rig:

  • Length:

  • Hull Material:


  • Body of Water:

    Saint Lawrence

  • Depth min:


  • Depth max:


  • Current:

    1-2 Knots

  • Buoy Type:


  • Line Type:

    Polypro - twist

  • Line Size:


  • Buoy Anchor Type:

    Cage & Rock

  • SOS Plaque:


  • Notes:

    Line tied to iron work for gates.

  • Description:

    Town of Mille Roche was flooded for the St. Lawrence Seaway in 1958. Building torn down, but gates, generators, turbines, aquaducts all still intact. Penetration not recommended.

Buoy Status Updates

Site Name Record Date Buoy Status NOTSHIP# Comment
Mille Roche Power House18/10/2020RemovedC-2013-20 Conical buoy removed for the winter and replaced with a temporary jug.
Mille Roche Power House06/06/2020DeployedNW-C-0763-20Conical buoy deployed by John Mondoux from Seaway Valley Divers.
Mille Roche Power House14/10/2019RemovedNW-C-2521-19Removed for the winter by Seaway Valley Divers, replaced with temporary jug.
Mille Roche Power House18/05/2019DeployedNW-C-0830-19Conical buoy deployed by John Mondoux and Wayne Fortier from Seaway Valley Divers on May 18, 2019.
Mille Roche Power House25/11/2018RemovedC2909/18

Save Ontario Shipwrecks gratefully acknowledge the Ministry of Tourism, Culture and Sport, Culture Programs Unit and our many sponsors for their support. We also gratefully acknowledge the financial support of the Ontario Trillium Foundation, an agency of the Ministry of Culture.