Barrage Vauban, Strasbourg

The Barrage Vauban, or Vauban Dam, is a bridge, weir and defensive work erected in the 17th century on the River Ill in the city of Strasbourg in France. At that time, it was known as the Great Lock (grande écluse), although it does not function as a navigation lock in the modern sense of the word. Today it serves to display sculptures and has a viewing terrace on its roof, with views of the earlier Ponts Couverts bridges and Petite France quarter. It has been classified as a Monument historique since 1971.The barrage was constructed from 1686 to 1690 in pink Vosges sandstone by the French Engineer Jacques Tarade according to plans by Vauban. The principal defensive function of the barrage was to enable, in the event of an attack, the raising the level of the River Ill and thus the flooding of all the lands south of the city, making them impassable to the enemy. This defensive measure was deployed in 1870, when Strasbourg was besieged by Prussian forces during the Franco-Prussian War, and resulted in the complete flooding of the northern part of the suburb of Neudorf.

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