This unprotected building is part of the Miramas-Marseille railroad line and overlooks the Eaux Salées cove. It is only accessible by train.
It has been awarded the 20th-century heritage label by the Regional Commission for Heritage and Sites (CRPS) on November 28, 2000.
In November 1883, the Paris-Lyon-Méditerranée (PLM) company won the concession for an Estaque-Miramas line via Port-de-Bouc, declared to be in the public interest by the law of June 1904.
The railroad opened in October 1915, after years of construction work, the cost and duration of which were constantly increased by the relief and nature of some of the terrain.
Designed by PLM engineer Paul Séjourné (1851-1939), the Eaux Salées viaduct is one of the line's most remarkable structures, thanks to its technical qualities.
Constructed entirely of masonry, it takes the form of an arch 25 m high and 50 m wide. This is complemented by a series of vaults that visually and physically lighten the whole structure, which is supported on limestone escarpments. Despite this, the foundations had to be dug 22 m below sea level, to ensure the building's stability.
