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.

Latest update

July 29, 2022 - The assessment decision statement has been issued to the proponent.



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

  • Start Date

  • Proponent

    Parks Canada
  • Authorities

    • Parks Canada Agency
  • Assessment Type

    Project on federal lands
  • Reference Number


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.


Nearby assessments

...within 200 kilometres
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