Project scope
Plan: Replace the existing three-span metallic railway bridge, about 143 m long, with a new deck of steel beams integrated into concrete for ballasted track. The new deck is specified as 143.92 m long, compared with 142.80 m for the existing deck, and is intended to increase clearance below the bridge by 49 cm to 6.1 m. The existing supports are to be retained and their foundations strengthened: 12 piles are specified for the Varennes-sur-Seine C3 abutment, while other supports are to be reinforced by cement-grout injection. Separately, the opinion records a temporary river-pile discrepancy: the dossier indicated 32 piles in the major riverbed, while the latest sizing was said to require 8–12; this is distinct from the 12 piles specified at C3.
Reported status and procurement
- Reported development
Plan: The opinion described works lasting about two years, with a planned start in January 2026, deck replacement targeted for August 2027 and completion planned for January 2028. Three work areas were planned: a main area on Haropa Port land at Varennes-sur-Seine, a secondary area on the Varennes-sur-Seine side and a connected area at La Grande Paroisse. River transport was to be prioritised, with land access also planned. Enabling works included temporary supports and pontoons, about 450 m³ of dredging near La Grande Paroisse, and demolition of disused railway structure OA1 to provide access; OA1 was not to be rebuilt. The opinion also described nine night-time rail interruptions, a full 16-day rail closure, and a three-day interruption to river traffic. These are plans reported in 2025, not confirmation that works occurred.
- Procurement availability
- Unknown / not established
Reported regulatory context
A case-by-case decision dated 17 September 2020 required environmental assessment. The opinion reports an application for environmental authorisation under water legislation and a dossier seeking derogation from protections for protected species and their habitats. The environmental authority's opinion, adopted on 24 July 2025, assesses the impact study and environmental treatment; it is expressly neither favourable nor unfavourable and is not itself an authorisation decision.
A source report alone does not establish current progress or an open buying window.
Project summary
Remplacement du pont ferroviaire sur la Seine à Varennes-sur-Seine et la Grande Paroisse
SNCF Réseau’s project is to replace a three-span metallic railway bridge, about 143 m long, across the Seine between Varennes-sur-Seine and La Grande Paroisse. The bridge carries line 746000 between Corbeil-Essonnes and Montereau, used by suburban, regional and freight trains. The planned replacement is a steel-beam deck integrated into concrete for ballasted track, with the existing supports retained and their foundations strengthened. The 12 piles specified for the C3 abutment are separate from the river-pile figures: the dossier listed 32 piles in the Seine’s floodplain, while the latest sizing reported to the authority’s rapporteurs indicated that 8–12 should be needed there.
The environmental authority opinion adopted on 24 July 2025 described an approximately two-year works plan, with a January 2026 start planned, deck replacement targeted for August 2027 and completion planned for January 2028. These are planned dates reported in 2025, not confirmation that the works occurred. The opinion described three work areas and stated that river access would be prioritised, with land access also planned.
The operation was estimated at about €52 million excluding tax, including €38 million for the bridge. The estimate was supplied orally to the rapporteurs during their site visit; its value year and the share attributable to environmental measures were not specified in the dossier. The opinion noted that the project’s ecological assessment and mitigation still needed updates: although the dossier assessed residual effects on protected species as not significant, the authority called for compensation and an updated derogation dossier for several groups, and said effects on the protected thick-shelled river mussel from river works could not be ruled out. The opinion assesses the impact study and environmental treatment; it is expressly neither favourable nor unfavourable and is not an authorisation decision.
Evidence limits and unknowns
The opinion adopted on 24 July 2025 gives planned dates but does not establish whether the works started, their current status, or whether they were completed.
The supplied opinion does not establish the outcomes of the environmental-authorisation or protected-species derogation procedures.
The final number of piles in the river is not established: the dossier listed 32 in the floodplain, while the latest sizing indicated 8–12. The opinion later reported that the proposed vessel waiting area was abandoned, while an existing right-bank area was under discussion as an alternative; it does not establish the final arrangement.
The opinion does not confirm final ecological survey results, compensation decisions, or completion of the proposed 30-year management agreement for the wetland compensation site.
The supplied opinion does not identify a contractor, procurement award, or financing arrangement.
