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Heritage classified

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Origin and history

The Seychalles Bridge, located at Thiers in the Factory Valley, is a medieval structure crossing the Durolle. Built between the 15th and 17th centuries, it is one of the oldest bridges in the city with the Navire Bridge, the Saint John Bridge and the Vielh Bridge. Its name, attested as early as 1476 in the form of "bridge of Seychal", would come from the Gallic sesca (roseau) or from the Seychalhi auvergnat, designating a steep terrain where the water runs without infiltrating. This bridge was an essential link in the "Route de Lyon", a strategic axis for the trade in iron and steel, fuelling the cutlery workshops in Turin.

The bridge was integrated into the defensive system of the city, protected by the door of Seychal (XVI century) and a guard corps located nearby. These fortifications controlled the eastern access of Thiers, supplemented upstream by the Lyon gate. The surrounding area housed tanneries (11 workshops mentioned in 1476) and stationery, the latter located downstream to avoid the pollution of the Durolle. The archives reveal major repairs in the 17th and 18th centuries, notably in 1654, 1711, 1753 and 1785, while its apron was expanded in the late 19th century with the addition of a metal guard.

Architecturally, the bridge is distinguished by its two broken arches in Gothic style, adapted to the rugged relief of the valley. The central pile, equipped with avant-becs and arrière-becs, resisted the flood of the Durolle and once supported a dam for a mill. Built of local granite rubble, its apron follows the natural slope of Durolle Street, avoiding costly embankment work. Ranked a Historic Monument in 1926, it now symbolizes Thiers' industrial heritage, in the heart of the Mills valley in cultural and artisanal conversion.

The bridge also marked local life by its role in the cutlery industry, with the eponymous Pont de Seychalles (known as the Paquebot), active until the years 1990-2000. A scene from the film Les Choristes (2003) was shot there, immortalizing its picturesque setting. Since the abandonment of industrial activities, the site has been part of rehabilitation projects combining tourism, crafts (such as the installation of the Fontenille-Pataud cutlery in 2021) and heritage preservation.

Ancient sources, such as the Napoleonic cadastre of 1836 or the burrows of the 15th to 16th centuries, mention the bridge under various names (large bridge, Durolle bridge), reflecting its varying importance depending on the times. The 19th century lithographs offer romantic views, while the 20th century photographs document its transformations, including the addition of the metal guard and the partial disappearance of the downstream dam. His history thus illustrates the evolution of construction techniques and urban uses in Thiers, between defence, trade and industry.

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