A damaged steel beam on the HonorĂ©-Mercier Bridge has sparked discussions about the necessity of a new connection between Montreal and the South Shore, highlighting the ongoing debate between maintaining existing infrastructure and investing in a new bridge. Quebec’s Transport Ministry recently announced the indefinite closure of the left lane towards Montreal due to the discovery of a crack during maintenance activities.
With the bridge enduring heavy traffic over the years, including an average of 76,000 daily crossings and exposure to weather-related deterioration, the question arises whether a complete bridge replacement is the most viable solution. Lotfi Guizani, a structural engineering professor at École de technologie supérieure (ETS), emphasized the importance of considering the balance between the escalating maintenance costs of current infrastructure and the potential expenses of constructing a new bridge.
Guizani estimated that the construction of a new bridge could span at least seven years and cost billions of dollars, potentially surpassing the $4.2-billion budget of the Champlain Bridge, depending on the project’s scale and the impact of increasing construction costs and inflation. To address the financial challenges, Guizani proposed exploring alternative funding mechanisms, such as implementing tolls for bridge usage, to support the construction endeavor.
Amidst concerns over the financial implications and complexities of a new crossing, local leaders advocate for proactive planning to address long-term transportation needs and avoid future disruptions. ChĂ¢teauguay Mayor Éric Allard underscored the urgency of considering a new bridge as a critical infrastructure investment. Similarly, Mercier Mayor Lise Michaud emphasized the community’s fatigue with ongoing repairs and urged for transparent infrastructure planning and effective coordination among public authorities to tackle regional transportation challenges.
Grand Chief Cody Diabo of KahnawĂ :ke highlighted the safety risks faced by the community during bridge diversions and called for meaningful involvement in transportation and infrastructure planning processes to mitigate adverse impacts. The Transport Ministry indicated that the reconstruction of the South Shore-bound structure is in the initial stages of planning, with further assessments needed to determine costs and timelines.
As efforts continue to repair the damaged beam and normalize traffic flow, the discussion around the future of the Honoré-Mercier Bridge remains a focal point for stakeholders and residents alike.

