Cize-Bolozon viaduct, Double-deck transport viaduct in Ain, France
The Cize-Bolozon viaduct spans 273 meters across the Ain gorge, combining railway tracks on the upper deck and vehicular traffic on the lower level.
Built in 1875, the original structure was destroyed during World War II and subsequently reconstructed, reopening in May 1950 to restore regional connectivity.
The viaduct represents a significant development in French engineering, demonstrating the technical capabilities of combining rail and road transport in mountainous regions.
The structure serves as part of the Ligne du Haut-Bugey railway line while simultaneously providing a road connection between Poncin and Thoirette.
Rising 73 meters above the Ain gorge, the viaduct features 11 spans that carry both train and automobile traffic across two separate levels.
Location: Bolozon
Location: Corveissiat
Inception: 1875
Floors above the ground: 2
Height: 73 m
Length: 273 m
Part of: Ligne du Haut-Bugey
GPS coordinates: 46.21554,5.45123
Latest update: September 23, 2025 16:45
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