New navigation aid structure - Deslauriers Island alignement

Public Notice

New navigation aid structure – Public Comments Invited

March 22, 2023 – The Canadian Coast Guard must determine whether the proposed new navigation aid structure, located on Saint-Therese Island, Varennes, is likely to cause significant adverse environmental effects.

To help inform this determination, the Canadian Coast Guard is inviting comments from the public respecting that determination. All comments received will be considered public and may be posted online.

Written comments must be submitted by may 15, 2023 to:

Mathieu Chevarie
550 Avenue D'estimauville, 3ième étage, Québec, (Qc)  G1J 0C2

The Proposed Project

A new navigation aid structure is planned to be built on St. Therese Island to form the Deslauriers Island range. The new tower will be the posterior light of the alignment which is essential for marine traffic in the St. Lawrence River.

The proposed structure is a steel clerestory tower with a footprint of 1524 mm x 1524 mm and a height of 24.42 meters. A daymark will be installed on the structure to provide alignment and a solar powered lantern will be installed on top of the tower. The type of foundation to be used has not yet been determined.

Access to St. Therese Island will be by transport barge and then access roads will be used to get to the site. The work could require concrete work and the presence of heavy machinery such as a mechanical shovel and a crane.

The timeframe for the work has not yet been determined, but the target period is between December 2023 and March 2024. It is expected that this project will take approximately 1 month to complete and the work will take place during daytime only.


Latest update

July 20, 2023 – The Canadian coast guard issued its Notice of Determination and determined that the project is not likely to cause significant adverse environmental effects.



Mathieu Chevarie
Marine and Civil Infrastructure
Mathieu Chevarie, Civil engineering technician
1550 Avenue D'estimauville, 3ième étage, Québec, (Qc) G1J 0C2
Lévis, Quebec G6Z 0E8
Telephone: 418-571-0489

  • Location

    • Sainte-Therese Island (Quebec)
  • Nature of Activity

    • Defense and Security
  • Assessment Status

  • Start Date

  • Proponent

    Canadian Coast Guard
  • Authorities

    • Fisheries and Oceans Canada
  • 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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