Viaduc de Carrières-sur-Seine

The year is 1996. A ribbon is cut, officially opening the Viaduc de Carrières-sur-Seine. This isn’t just another bridge. It’s a concrete giant, stretching 510 meters across the Seine, linking Nanterre and Carrières-sur-Seine. The Viaduc de Carrières-sur-Seine isn’t merely a roadway; it’s a symbol of progress, connecting the historic heart of Paris to the bustling La Défense business district. Imagine the view from this vantage point. You can see the culmination of an axis that begins at the iconic Place Charles-de-Gaulle, sweeps through Neuilly-sur-Seine, and dives under La Défense before emerging here. The Viaduc de Carrières-sur-Seine seamlessly integrates with the A86 motorway and the D986 road just southeast of the river, creating a vital transportation hub. This impressive structure is actually two parallel bridges, each composed of two distinct sections. The access viaducts, with their five spans of 30.5 meters each, were constructed using a clever method. They were cast in full spans on temporary supports resting on the ground. The main viaducts, also with five spans, were built using an even more innovative technique called balanced cantilever construction, using two mobile “under slung” crews. This allowed the bridge to gracefully stretch across the Seine. This dual nature of the Viaduc de Carrières-sur-Seine is reflected in its design. The access viaducts have prestressed concrete decks with multiple ribs, suited for shorter spans. The main viaducts, however, boast a single-cell box girder design, with a variable height ranging from 3 to 8 meters, perfect for clearing the Seine. Even the foundations of the Viaduc de Carrières-sur-Seine tell a story of engineering ingenuity. The piers of the Seine crossing stand on molded wall bars driven an astounding 40 meters deep. The access viaduct piers, however, are supported by drilled piles reaching 18 meters down. This bridge wasn’t just built; it was meticulously crafted by Bouygues Construction, GTM Construction, and VSL International, a testament to human collaboration and engineering prowess. As you stand here, on the Viaduc de Carrières-sur-Seine, remember it’s more than just a way across the river. It’s a feat of engineering, a symbol of connection, and a gateway to the modern heart of Paris.