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Origin and history

The Querqueville dam is an integral part of the Cherbourg harbour, the world's second largest artificial harbour after Ras Laffan (Qatar). Its construction, begun in 1783 under Louis XVI, is part of an ambitious military and commercial protection project for the Normandy coast. The 3,640-metre-long central dike was completed in 1853, while the East and West dikes were completed in 1895. It is based on innovative techniques for the time, such as the use of wooden cones filled with stones (Cessart method), and then massive rocking.

The initial project, designed by engineer La Bretonnière, provided for a 4 km dam linking Pelee Island to Querqueville, despite the reserves of Vauban and Dumouriez, who supported a shorter solution. The works, interrupted by the Revolution, resumed under Napoleon I in 1802, with engineer Cachin. The dam became a strategic issue to counter British attacks and serve as a base for privateers. Its completion under Napoleon III made it a symbol of French maritime power.

The dam is marked by strong defensives, including those of Querqueville, Chavagnac, and Pelee Island, designed to protect the East and West passes. These works, partially modernized in the 19th century (contoning, batteries), reflect the evolution of artillery. The Cabart-Danneville Pass, pierced in the eastern dike, facilitates access for fishermen. Despite the destruction of the Second World War, like that of the East Fort, the whole remains intact, avoiding the destruction by the Germans in 1944.

The Cherbourg harbour, with 1,500 hectares, hosts historical events, such as Queen Victoria's visit in 1858 or the Titanic stopover in 1912. It is also the scene of maritime accidents, such as the drowning of astronomer Delaunay in 1872 or the collision of the Kaiser Wilhelm der Grosse in 1906. Ranked a Historic Monument in 2021, the Querqueville dyke today embodies an exceptional industrial and military heritage.

The strong associates, such as Querqueville (1786) and Pelee Island (1779), illustrate defensive architecture from the 18th to the 19th century. Some, such as the fort of the Flemish (1844-1858), have lost their military vocation and are now undergoing rehabilitation. Others, such as Fort Central, played a role during the Liberation in 1944. These works, inscribed in the Historical Monuments, underline Cherbourg's sustainable strategic importance in French naval history.

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