Tunnel à Chartainvilliers dans l'Eure-et-Loir

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Origin and history

The Chartanvilliers tunnel is part of the Eure Canal project, also known as the Louis XIV Canal or the Maintenon Canal. This canal, designed by Vauban between 1685 and 1688, was to bring water from the Eure to the reservoirs of the Parc de Versailles to feed its fountains. Commanded by Louvois, superintendent of the King's Buildings, the site mobilized up to 30,000 men, including 22,000 soldiers, but was interrupted in 1688 by the war of the Augsburg League and never taken over.

The tunnel is one of the works of art built to cross the natural obstacles on the route of the canal. At Chartanvilliers, two tunnels, "La Petite Voûte" and "La Grande Voûte", were built in 1680 and inscribed in the Historical Monuments in 1934. These structures, dug under imposing earthworks, were to allow the passage of the canal through reliefs, while ensuring the evacuation of the waters from the valleys crossed.

The project, though pharaonic, was marked by technical and human difficulties. About 10,000 workers and soldiers died, suffering from diseases such as malaria or accidents. Despite £9 million spent and the innovative techniques used (such as coal-fired lime ovens), the canal remained unfinished. Today, his remains, including the tunnels of Chartanvilliers, recall the audacity and limitations of the great works of Louis XIV.

The canal was to cross several municipalities of Eure-et-Loir and the Yvelines, including Pontgouin, Maintenon and Chartanvilliers. Nearby, other remarkable works remain, such as the unfinished Maintenon aqueduct or the arches of Saint-Arnoult-des-Bois. These elements, classified or listed in the Historical Monuments, illustrate the scale of the project and its legacy in the local landscape.

Designed against a water shortage in Versailles, the Eure Canal reflects the hydraulic challenges of the seventeenth century. Marly's machine, already in place, was not enough to meet the growing needs of the castle fountains. Vauban, an expert in fortifications and hydraulics, proposed this canal as a durable solution, combining pipes, aqueducts and tunnels. Despite its abandonment, the project remains an exceptional testimony of military and civil engineering at the time.

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