Timeline

Heritage classified

Key figures

Origin and history

The Chassiron lighthouse, located at the northern end of the island of Oléron near Saint-Denis-d-Oléron, was built between 1834 and 1836 under the direction of engineer Lescure Bellerive. It replaced a first tower built in 1685 on the orders of Colbert, which had become ineffective in the face of increased maritime traffic and the erosion of the cliff. This 43-metre lighthouse, originally equipped with advanced technologies such as a vegetable oil lamp, marks the entrance to the Antioche pertuis, an area renowned for its reefs and numerous shipwrecks.

The current structure, classified as a historical monument in 2012, is based on foundations of 18 metres in diameter and 3 metres in depth, built with Crazannes stones (Charente-Maritime) and Vendée granite. Its 224 steps spiral staircase leads to a lantern visible up to 52 km, thanks to a 250-watt white flashing light. The lighthouse, originally white, was equipped with three black bands in 1926 to distinguish it from the lighthouse of the Whales, located on the island of Re.

Chassiron's history is marked by successive technological innovations: switching to an oil gas lamp in 1895, experimenting with acetylene gas between 1902 and 1905, then electrifying in 1930 with a bulb of 2,400 watts, reduced today to 250 watts. Automatized in 1998, it remains the second oldest lighthouse in France still in operation, after Cordouan. Its outbuildings include a rotunda housing a museum on traditional fisheries and local agriculture, as well as a remarkable wind rose garden.

The site also includes a fish lock, a small model of typical Oléron constructions, illustrating local fishing techniques. These stone and crescent locks trap fish during tides, reflecting an ancestral maritime heritage. The lighthouse, open to the public, attracts about 164,000 annual visitors (2012 figures) and offers stunning views of La Rochelle, the island of Re and the north of Oléron.

The Chassiron Lighthouse, which is fully classified with its dependencies and soil, shows the evolution of maritime lighting techniques and the adaptation of coastal infrastructure to geographical challenges. Its architecture, combining robustness and functionality, makes it a symbol of the industrial and maritime heritage of New Aquitaine.

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