Tadoussac and Baie Ste-Catherine


As part of this project, BLM was responsible in this mandate by the client of management of budgets and schedules, coordination of resources, production of deliverables, etc. and carried out underwater inspections and anode cleaning and replace them.




Tadoussac and Baie Ste-Catherine




Société des Traversiers du Québec

Nature of the mandate


Surface and underwater inspection of the two(2) wharves of the ferries linking Baie-Sainte-Catherine to Tadoussac. Following the inspections, the sacrificial anodes were cleaned and some of them were replaced.

Services rendered


  • Visual inspection of both(2) structures with full video recording.
  • Replacement and cleaning of sacrificial anodes
  • Technical data :
    • Comparative verticalities of the sheet piles for jetties and landing stages.
    • Residual steel thicknesses: Support piles and sheet piles.
    • Use of weightings in relation to observed corrosion craters.
    • Verification – Berlin walls.
    • Verification and replacement of sacrificial anodes.
  • Technical report including comparative analysis over time.

Challenges and solutions


Logistics vs. security problem due to the constant presence of moving ferries in addition to the vortices created by the Saguenay current. Problems partially resolved by using a direct communication system between the diving team and the ship captains. In addition, access to the water was guaranteed by the descent of the diver by a hydraulically driven cage between the buttresses of the structures in the interior section between the rock massifs and the deck of the wharves.