The Argenteuil Bridge, which spans the Seine on the RD909 between the Val-d'Oise (95) and the Hauts-de-Seine(92), will not reopen on the expected date. While traffic was due to resume on August 28, the Val-d'Oise Department, the project owner, has announced a postponement of the reopening to mid-October 2026 at the earliest.
The news is unlikely to please the daily users of this bridge, which around 32,000 people cross each day between Argenteuil, Gennevilliers and Colombes. Motorists, for their part, will have to be patient a few more weeks, as the September back-to-school rush begins.
The works began at the start of July and were due to be completed by the end of August. It forms part of the broader rehabilitation of this 1947-era landmark, including the creation of safe bike routes along the Seine.
All the action is happening beneath the road surface. After removing the old pavement and waterproofing layers, crews uncovered significant deterioration of the deck, the concrete slab that carries traffic. According to the Department, these defects could not have been detected before the structure was fully unmasked.
Good news, all things considered: at this stage, the damage does not affect the bridge’s structural integrity. It does, however, mandate additional work to ensure the safety of road users, which explains the schedule shift.
Throughout the construction period, the bridge will be closed to motor traffic. Pedestrian and cyclist access remains, provided cyclists dismount to cross. It’s wise to plan your trips in advance and use alternative routes.
In Argenteuil, the city is reviewing its traffic plan and signal timing to align with observed flows. It is also coordinating with state services, local authorities, emergency services, law enforcement, and transport operators to curb congestion.
To accurately gauge the scale of the damage, the Department has launched, with the support of CEREMA, a series of thorough inspections. Core sampling and analyses are being conducted across the entire deck to assess the condition of the concrete.
These results will allow officials to settle on the repair approach, followed by a new, reliable timeline. The department pledges to communicate it as soon as possible and says it will mobilize to reopen the site at the earliest opportunity. In the meantime, mid-October 2026 remains the most optimistic horizon.
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Location
Pont d'Argenteuil
92230 Gennevilliers
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