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Heritage classified

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Origin and history

The canal bridge of the Orbiel, located in Trèbes in the Aude, is a major hydraulic structure of the Canal du Midi, built between 1686 and 1687. It was built under the direction of Antoine Niquet according to the plans of Vauban, to replace a dam destroyed on the Orbiel. This three-arched aqueduct, designed to avoid navigational disturbance during floods, became a model of engineering cited in the hydraulic treatises of the time. Its 16.60-metre-wide vaults allow the passage of the canal and the haulage paths, while its batteries reinforced by foothills resist violent currents.

Ranked a historic monument in 1950, the Orbiel Canal Bridge embodies 17th-century technical innovation. Vauban, inspecting the works of the Deux-Mers Canal, had identified the risks of flood obstruction and advocated aqueducts for all river crossings. The work, with its monumental arches and three-piece keys, combines functionality and aesthetics. The triangular spurs of the batteries, now partially buried under the pebbles, bear witness to the challenges posed by river dynamics.

The Orbiel, an intermittent river, flows under the western ark only at the stretch, but invades the three arches during the flood. The walls in return for abutments, reinforced by foothills, illustrate the precautions taken against hydraulic forces. The canal bridge, integrated into the Trèbes landscape, remains a remarkable example of military architecture adapted to civilian infrastructure, reflecting the duality of Vauban's talents, both engineer and strategist.

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