Deconstruction of the Île des Sœurs Bypass Bridge
November 16, 2023 Bonaventure sector Bonaventure Reconstruction

The Île des Sœurs Bypass Bridge, a temporary structure built in 2014, will be deconstructed from November 2023 to December 2024.

This project will not cause any major traffic hindrances.



The Île des Sœurs Bypass Bridge was opened to traffic in 2014. This temporary structure was used as a detour while the new Île des Sœurs Bridge was being built for the construction of the Samuel De Champlain Bridge.

When the new Île des Sœurs bridge was commissioned on November 12, 2018, the temporary bypass bridge was disconnected from the road network. Now that it no longer needs to be used as a storage site for the deconstruction of the original Champlain Bridge or the construction of the REM, it can now be deconstructed.


Deconstruction method

The bridge will be deconstructed by the contractor EBC, and the project will include a material reuse program. Some structural components, such as 24 steel girders, will be preserved and reused for other infrastructure projects.


Impacts on mobility

As the bypass bridge has already been disconnected from the road network, no major impacts on traffic are expected.

In terms of active mobility, the bicycle path through the multipurpose tunnel to the south of the bridge will be closed for a few weeks (starting in January 2024). This closure is necessary in order to deconstruct the tunnel. A detour route will be posted on site.


Noise mitigation measures

Sound level meters will be set up at strategic locations around the site to measure noise levels. If levels are exceeded, the work methods will be adjusted. Work at the site will be carried out from 7 a.m. to 4:30 p.m., Monday to Friday.


Environmental protection

Since most of the work will be carried out in a marine environment, a fish habitat restoration plan has been developed. A protective curtain will be set up in the water around the abutments to avoid impacting any aquatic wildlife. In-water work will be done outside of periods that are sensitive for species in the area.

To protect local bird populations, nets will prevent swallows from nesting under the bridge during the deconstruction period, and a new nesting site will be created nearby.

Brown snakes in the area will be relocated outside the work zone.


Work schedule

  • Site start-up: October 2023
  • Start date of demolition work: November 2023
  • Closure of the multipurpose path: January 2024
  • Start date for work over the water: July 2024
  • Revegetation of the approaches: October 2024
  • End of work: December 2024
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