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Heritage classified

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Origin and history

Lake Saint-Ferréol is an artificial reservoir created in the 17th century in the Black Mountain, on horseback in the departments of Haute-Garonne, Tarn and Aude. Designed as the main supply tank of the Canal du Midi, it was built between 1667 and 1675 under the direction of Pierre-Paul Riquet. This weight dam, the largest in the world, used an innovative structure with three granite walls and embankments to withstand hydraulic pressure. Its role was crucial in regulating the flow of water to the Naurouze threshold via the plain channel.

In 1685 Vauban inspected the site and ordered its expansion, including the breakthrough of the Cammazes and the upgrading of the dam to 6.3 million m3. The work, led by Dominique Gillade and Mathieu Cayrel, completed around 1694, making Saint-Ferréol the largest dam in France at the time. Despite problems of sealing due to local granite, the building remained functional and was modernized in the 19th century with bronze valves.

In the 20th century, the lake became a tourist place: in 1930, facilities (tennis, sailing, swimming) were installed there, replacing a more ambitious initial project including hotel and casino. Ranked a historic monument in 1997 and integrated with UNESCO World Heritage in 1996, the site now houses a museum on the Canal du Midi. Its dam, with its underground galleries and regulation channels, remains a masterpiece of hydraulic engineering.

The lake extends over 67 hectares, bordered by freeboards and fed by the Black Mountain channel. Its history reflects the technical challenges of the time, from its construction under Louis XIV to its subsequent adaptations. The village of Saint-Ferréol, located on its banks, and the neighbouring communes (Sorèze, Vaudreuille, Les Brunels) share this hydraulic heritage, today also popular for its nautical activities as for its historical role.

The dam also inspired the cinema, with films such as L的Enfer (1994) or Le Miracle des loups (1961). Its architecture, combining massive walls and embankments, illustrates the audacity of Riquet and Vauban. The visits allow you to discover its submerged galleries, its tap room, and the drains that evacuate the excess water to the Laudot, testifying to a hydraulic system that is still operational after more than three centuries.

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