Cize–Bolozon viaduct

The Cize–Bolozon viaduct is a combination rail and vehicular viaduct crossing the Ain gorge in France. It is a structure that connects the communes of Cize and Bolozon in the Ain département.
In 1875, an original span built in the same location but was destroyed later in World War II. The viaduct was reconstructed as an urgent post-war project due to its position on a main line to Paris. It reopened in May 1950.
It has two different levels: the upper level is a railway while the lower carries road traffic. The railway was closed for reinforcement and restoration in 2005, and reopened in December 2010 as part of the Ligne du Haut-Bugey. The lower level is a local road from Poncin to Thoirette.