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Honoré Mercier Bridge

General Information

Other name(s): Pont Honoré-Mercier
Beginning of works: 1932
Completion: 11 July 1934
Status: in use

Project Type

Structure: main span:
Truss arch bridge
Function / usage: Road bridge
Material: Steel bridge


Location: , , ,
, ,
  • Saint Lawrence
Next to: Honoré Mercier Bridge (1963)
Coordinates: 45° 25' 4.51" N    73° 39' 16.63" W
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Technical Information


total length 1 933.19 m


truss steel

Excerpt from Wikipedia

The Honoré Mercier Bridge in Quebec, Canada, connects the Montreal borough of LaSalle on the Island of Montreal with the Mohawk reserve of Kahnawake, Quebec and the suburb of Châteauguay on the south shore of the Saint Lawrence River. It is the most direct southerly route from the island of Montreal toward the US border. It carries Route 138, originally Route 4. It is 1.361 km (0.846 mi) in length and contains four steel trusses on its first section. The height of the bridge varies from 12.44 m (40.8 ft) to 33.38 m (109.5 ft) with the highest sections located over the St. Lawrence Seaway. The bridge is named after former premier of Quebec Honoré Mercier.

Unique in Quebec, the bridge is managed by both the federal and provincial governments. The southwest portion of the bridge, over 1,031 metres from the beginning of the arch bridge (at pile14), is the responsibility of a Crown corporation: the Jacques Cartier and Champlain Bridges Incorporated (JCCBI). The rest of the bridge (902 meters) is owned by the Quebec Ministry of Transport, which is also responsible for the day-to-day operations of the complex, including the federal part.

The bridge has two lanes of traffic in each direction and a total span of nearly two kilometres. At its highest point, the bridge rises 36 metres above the river. There is a narrow sidewalk on the side headed to Châteauguay that was for use by foot or bicycle, however it hasn't been open since major repairs began in 2009. The roadway has been characterized by numerous repairs.

It is estimated that an average of 75,000 vehicles use the bridge each day. An estimated 30 million vehicles use the bridge every year.


Before the bridge was built there was a ferry service.

The bridge, known in the developmental stage as the "Saint-Louis Bridge" (for the nearby located Lake Saint-Louis and the parish of Saint-Louis-de-Caughnawaga, today part of the Kahnawake reserve), was designed by eleven French-Canadian engineers, all graduates of the École Polytechnique de Montréal, and was built by the Dominion Bridge Company Ltd under a government-funded work program. Construction of the bridge began in November 1932 and was completed in the early summer of 1934. It was opened to traffic on June 22, 1934 (named "Honoré-Mercier" during its inauguration by mayor Taschereau, 10 months ahead of schedule with a toll of 50 cents for an automobile and driver—later reduced to 25 cents. Today there is no toll charged for crossing the bridge.

The original east approach was on Lafleur Avenue, which ran straight into the Gauron Bridge over the Lachine Canal.

The higher section over the Saint Lawrence Seaway was added in the late 1950s. In August 1963, the Quebec Department of Public Works approved the construction of a "second" bridge downstream from the first. This increased the number of lanes from two to four.

Oka Crisis

During the Oka Crisis in July and August 1990, the bridge was closed to all traffic for over a month by Mohawks who supported their brothers from Kanesatake. This closure period led to violent tempers and clashes between Mohawks and people from Châteauguay, and the extension of Autoroute 30 bypassing the Kahnawake reserve. As a compensatory measure, the Champlain Bridge Boom was opened to motorists and a temporary rail shuttle was introduced.

Mohawks in Support of the Caledonia Group

During the Caledonia land dispute, certain individuals from Kahnawake erected Warrior and Confederacy flags on the steel trusses of the bridge to show their support.

The bridge was closed for a short period, in order to allow several men from the community to climb the structure and secure the flags. To ensure their safety, the Kahnawake Peacekeepers stopped traffic from the Kahnawake side of the bridge, while the Quebec Provincial Police blocked access on the Lasalle side. Several weeks later one of the Warrior flags was removed from the bridge and replaced with a Quebec flag (the red Warrior flag is barely visible in the above picture between the first 'V' section of the truss).

On June 29, 2007, community members of Kahnawake staged a peaceful protest on the bridge, in support of the AFN's National Day of Action. Once again men from the community placed Warrior and Confederacy flags on the structure that spans the St. Lawrence Seaway.


The Jacques Cartier and Champlain Bridges Incorporated (JCCBI) (in French: Ponts Jacques Cartier et Champlain Incorporée, PJCCI), a federal Crown corporation, is responsible for managing, operating and maintaining the Mercier Bridge where it crosses the Mohawk Reserve of Kahnawake. This comprises the ramps leading to the bridge on the south shore ("Ramps" Sector), the span over the St. Lawrence Seaway ("Seaway" Sector), and the stretch above "Ile Maline" ("B1 Island" Sector). The Ministry of Transport of Quebec (MTQ) is responsible for the bridge where it crosses the St. Lawrence River ("B2" Sector).

Rehabilitation Project

2009 saw the start of a complete rehabilitation of the bridge, the largest ever undertaken in Canada. For the first time since 1934, the deck of the Mercier Bridge will be partially replaced. The work is expected to prolong the bridge's life for another 75 years. The bridge deck will be replaced using prefabricated concrete deck panels. The new deck will consist of more than 1,300 prefabricated concrete panels assembled with steel tension cables. In total, the new deck is an area of 40,684 m2. Numerous lane closures and redirection of traffic is expected to continue until work is completed. The project has been carried out in two parts: Phase A, replacement of the deck in the Ramps Section and Phase B, replacement of the deck in the B1, Seaway, and Mixed Sections. Phase A was handled by Kahnawake's Mohawk Bridge Consortium. Phase B was originally to be done by Pomerleau-de Mathieu Bard, but problems led to the removal of the contractor. The works were then completed by the Mohawk Bridge Consortium. The eight-year work on the federal part, led by contractor, Mohawk Bridge Consortium, was completed by the end of August 2016. A total of 982 new concrete panels were installed at a cost of $200 million.

Emergency closure

The Quebec Ministry of Transport (MTQ) initially planned to renovate the section of the bridge under its jurisdiction at the same time and in the same manner as the federal section. On June 14, 2011, due to the extreme deterioration of 10 gusset plates, the 1930s section of the Mercier bridge was closed until September 6 (in time for school restart). Engineers examined each gusset and designed an individual solution of either replacement or reinforcement aimed as a permanent solution, not a patch. Regular inspections found the gussets to be corroded beyond what was expected. Using all known weaknesses of the bridge structure, the engineers undertook a complete recalculation of the load bearing ability of the structure. Once they calculated that and factored in a margin for safety, they decided to close the bridge at 8:04 PM on June 14, 2011. The reinforcement of existing structures was staggered until 2013. In 2014, an in-depth study was commissioned to a consortium of BPR, Genivar and SNC-Lavalin firms to determine the optimal solution for the future of the section. Provincial Bridge: Major Rehabilitation or Reconstruction.

In April 2017, the Quebec government announced the construction of a new section towards the South Shore of Montreal. The date of the beginning of the work is not determined, but it will begin sometime in 2019, once the construction of the new Champlain Bridge is completed.

Text imported from Wikipedia article "Honoré Mercier Bridge" and modified on 22 July 2019 under the CC-BY-SA 3.0 license.


Currently there is no information available about persons or companies having participated in this project.

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