Viaduc de Chillon, Concrete road bridge near Chillon Castle in Veytaux, Switzerland.
The Viaduc de Chillon is a 2150-meter concrete road bridge carrying the A9 autoroute across Lake Geneva on two parallel beams for each traffic direction. It connects the Glion Tunnel to higher ground near Villeneuve, supported by concrete piers that vary in height from 3 to 45 meters depending on the terrain below.
The bridge was completed in 1969 by a construction consortium using prefabricated concrete sections assembled with overhead cranes between the support piers. The project represented a significant engineering achievement in Swiss highway construction of that era.
The viaduct stands close to Chillon Castle, a regional landmark that shaped its design approach. Travelers crossing it become aware of how the structure relates to the surrounding lakeside environment and the historic fortress nearby.
The viaduct is easily accessible for drivers as part of the A9 autoroute with no special detours needed. Pedestrians and cyclists have limited access since the bridge functions primarily as a high-speed highway route.
The bridge rises approximately 100 meters above Lake Geneva's surface and was deliberately designed to avoid clearing forests in the region. This choice made the project an early example of environmentally conscious infrastructure planning.
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