Origin and history
The Pontgouin Waterway, located in Maintenon and on the neighbouring municipalities of Berchères-Saint-Germain and Pontgouin, is a vestige of the Eure Canal (or Louis XIV Canal), an ambitious hydraulic project launched in 1685 under Louis XIV. Designed by Vauban, this canal was to bring the waters of the Eure to the reservoirs of Versailles to feed the fountains of the royal park, then expanding. The site of Versailles, which lacked water resources, required colossal solutions: after the partial failure of the Marly machine (1681-1682), unable to provide the required 6,400 m3/day, Louvois, Superintendent of Buildings, entrusted Vauban with the realization of this 80 km canal.
The works, which began in May 1685, involved up to 30,000 men, including 22,000 soldiers (10 per cent of the French army), assigned to earthworks and art works. Vauban, surrounded by military engineers such as Isaac Robelin or Mesgriny, applied innovative techniques: approach channels for materials, coal lime kilns, and recruitment of Flemish or Alsatian entrepreneurs. The route included a monumental water bridge at Maintenon (47 arcades, 28.5 m high), iron siphons to cross the valleys, and a dam at Pontgouin creating an artificial lake of 6 km. Yet, in 1687, 6,000 workers died of malaria, and the war of the Augsburg League (1688) stopped the construction site.
By the time of abandonment after 1697, the unfinished canal had already cost 9 million pounds and 10,000 lives. Among the remaining remains, the Maintenon aqueduct (classified MH in 1875), the Boizard locks (classified in 1910), or the tunnels of Chartanvilliers and Berchères-Saint-Germain (registered in 1934) testify to this titaniumic undertaking. The project illustrates the limits of royal power in the face of technical, financial and human constraints, as well as Vauban's audacity, combining military and hydraulic engineering. The earthworks and works of art, still visible 40 km between Chartres and Rambouillet, recall this disproportionate dream of domesticating nature for the glory of Versailles.
The canal was to cross Eure-et-Loir and the Yvelines, passing through 20 communes including Pontgouin, Saint-Arnoult-des-Bois (Arche du Brosseron), or Fontaine-la-Guyon (restored portion). In Maintenon, the unfinished aqueduct, with its 47 arcades, dominates the Eure Valley. The techniques used – such as cast iron siphons to cross the valleys – foreshadowed 18th-century innovations. Despite its failure, the site marked the history of French public works by its scale and brutality, symbolizing the technical absolutism of Louis XIV.
The context was that of a water race for Versailles: the courtyard, increased from 1,000 to 10,000 people, and the gardens, with their 1,400 water jets, required colossal resources. Marly's machine, pumping the Seine, proved insufficient. Vauban, an expert in fortifications, adapted his methods (threatly canals, military logistics) to this civil challenge. The Louvois regime, using massive troops, revealed a forced labour, where Protestant regiments (such as Languedoc) were assigned to the most difficult tasks. The final failure highlighted the tensions between royal glory and economic realities, the war emptying the state coffers.
Today, the remains of the canal – dikes, tunnels, and aqueducts – are protected under the Historical Monuments. The association for the Study and Protection of the Vestiges of the Canal de Louis XIV works to preserve them. The Maintenon site, with its imposing aqueduct, attracts visitors for its history and architecture, while the archives (vis de Vauban, correspondence de Louvois) illuminate the technical and human challenges of that time. The canal remains a symbol of the great untapped works of the reign of Louis XIV, where ambition ran against the limits of science and resources.
Announcements
Please log in to post a review