La Roche-Bernard bridge, Transportation bridges across Vilaine River in La Roche-Bernard, France.
The bridges of La Roche-Bernard cross the Vilaine River, featuring a suspension structure and a truss design that connect both riverbanks. These structures differ in their engineering approaches and shape the landscape at this important crossing point.
The first bridge opened in 1839, representing an early example of wooden suspension deck construction in France. This work marked a transportation advance in Brittany and eased connections between regions.
The bridge carries the name of La Roche-Bernard, the town on the north bank, though its span links the communes of Marzan and Nivillac. Until 1995 it carried the main road between Nantes and Brest; traffic now uses the N165 and the Pont du Morbihan, built 800 m upstream.
The current 1960 suspension bridge carries two traffic lanes with footways on both sides; its deck stands 54 m above the Vilaine, higher than the 1911 steel arch it replaced. The 1995 Pont du Morbihan, 800 m upstream, now takes most through traffic, so the old crossing is quieter. Only the masonry approach ramps and abutment foundations of the 1911 arch bridge survive beside it.
The 1960 suspension bridge's main cables are not anchored in concrete blocks: they are wound around the rock masses on each bank of the Vilaine. Its two concrete pylons rise 84 m, and the deck clears the river by 65 m, with a main span of 245 m.
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