Égratz Viaduct, Concrete viaduct in Passy, France
The Égratz Viaduct is a concrete bridge that crosses the Arve Valley near Passy, stretching for around 1,470 meters while reaching a height of 68 meters above the ground. It uses a curved box girder design that is about 11 meters wide, with individual spans measuring approximately 49 meters across.
The structure was completed in 1981 by the construction firm Grands Travaux de Marseille to establish a vital transportation link across the valley. Its completion helped modernize regional infrastructure and connected communities along the route through the Haute-Savoie area.
The viaduct has become a visible landmark in the Arve Valley landscape, recognized by locals as an important reference point in the region. It stands as a concrete presence in the mountain setting and marks the passage through this part of Haute-Savoie for travelers moving through the area.
The structure serves as a main passage connecting both sides of the valley through the Route Nationale N205, allowing vehicles to cross continuously throughout the day. A major renovation took place in 2015 to maintain its safety and ensure reliable use for the ongoing traffic that depends on this crossing.
The box girders were built using prestressed concrete, a technique that puts the concrete under pressure to give it extra strength for longer spans. This method was an advanced solution for the 1980s and allowed the bridge to cover such large distances across the valley.
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