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Origin and history

The Rouzat viaduct is a steel railway bridge built in 1869 by Eiffel and Cie, founded two years earlier by Gustave Eiffel. It crossed the Sioule on the Commentry-Gannat line, connecting Clermont-Ferrand to Montluçon and formerly serving the Lyon-Bordeaux link. Located between the communes of Bègues and Saint-Bonnet-de-Rochefort (Allier), it also overlooks departmental road 37 and the place called Rouzat, from which it derives its name. Its 130-metre apron, supported by two metal lattice batteries, marks a technical innovation for the time.

The Compagnie du Paris-Orléans, heir to the original project of the Grand Central, is the owner of the project. Designed by engineer Wilhelm Nördling, the viaduct is supervised by Théophile Seyrig, partner of Eiffel. As the company's first major railway structure, it precedes achievements such as the Garabit viaduct (1884). Its metal batteries, 60 meters high, replace the traditional masonry, a first for Eiffel, although the viaduct of Grandfey in Switzerland (1862) inspired it by its higher height (82 m).

Joined the Historical Monuments in 1965 with the Neuvial viaduct, it illustrates the evolution of construction techniques in the 19th century. Four viaducts on the Commentry-Gannat line are now protected, demonstrating the heritage importance of this railway line. The site, still in service, remains a notable example of French industrial architecture, combining functionality and technical audacity.

The viaduct is distinguished by its cross-trail structure of Saint-André, typical of the Eiffel bridges. Its massifs in masonry anchor the metal batteries, one of which rests in the bed of the Sioule. The west abutment, in stone, contrasts with the steel of the apron, reflecting the transition between traditional and modern materials. This mixture symbolizes the industrial era, where metal is gradually imposed in large works.

Its inscription in 1965 highlights its historical and technical value. The viaduct of Rouzat, along with those of Neuvial, Bouble and Belon, forms a coherent set of railway monuments protected in the Allier. These works, designed to last, also illustrate the expansion of the French railway network in the 19th century, facilitating exchanges between regions and countries.

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