Rehabilitation of the Lachine Canal Weir 1

Parks Canada is planning a rehabilitation project for the Lachine Canal Weir 1. The plans include removing the guillotine valves, removing the footbridge, modifying the overflow dam, demolishing shotcrete, cleaning and repainting certain components, adding guardrails, repointing the masonry and making repairs to the upper part of the downstream walls by adding thickness. Some electrical work is also required, such as removing the existing lighting system.

The plans include a permanent riprap fill to stabilize the walls downstream of the weir. A fish habitat enhancement component will be incorporated into the project by adding cobbles downstream of the weir, in addition to removing remnants of the forebay from the bottom, such as old lock gates in an advanced state of disrepair. The possibility of installing a safety and debris boom upstream as part of the project is also being evaluated.


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Latest update

October 14, 2021 – The public comment period on the project is closed. Parks Canada and Transport Canada are considering comments received to help inform its determination on whether the carrying out of the project is likely to cause significant adverse environmental effects.

Key documents

Key documents
Document Number Document Title File Date
1 New project being assessed by Parks Canada and Transport Canada - Public comments invited from September 14 to October 14, 2021 - September 14, 2021

List all records


Lachine Canal National Historic Site
105, McGill Street, 6th Floor
Montréal, Quebec H2Y 2E7
Telephone: 450-447-4832

  • Location

    • Lachine Canal National Historic Site (Quebec)
  • Nature of Activity

    • Other, not otherwise specified
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Parks Canada
  • Authorities

    • Parks Canada Agency
    • Transport Canada
  • Assessment Type

    Project on federal lands
  • Reference Number


Nearby assessments

..within 200 kilometres
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