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Key figures

Origin and history

The Maintenon water supply is an ambitious hydraulic project launched under Louis XIV to supply the Palace of Versailles with water. Initiated in 1684, it forms part of the Eure Canal (or Louis XIV Canal), designed to capture the waters of the Eure at Pontgouin and to transport them for 80 km. The works, led by Louvois after Colbert's death, began in 1686, but the crossing of the Eure Valley — via a monumental aqueduct 70 metres high — posed a technical and financial challenge. Vauban, initially requested, offers a less expensive crawling aqueduct (metal siphon), but Louvois and the King impose a stone structure, considered more prestigious.

The construction site is marked by tensions between Vauban and Louvois, the first criticising the project's gigantism and irregular arches, while the second defends a monumental approach. The works were abandoned in 1688, due to the war against the Augsburg League, leaving the waterworks unfinished — only the first row of arcades was built. Ranked a historic monument in 1875, it bears witness to the technical and political challenges of water supply in Versailles, where the needs (up to 100,000 m3/day) exceeded existing solutions, such as the Marly machine or the hijacking of the Bièvre.

Aqueduct is part of a series of aborted projects to solve the water shortage in Versailles. By 1662, the transformation of the castle and the influx of the court multiplied by ten the local population, exhausting water resources. Previous projects — diverting the Loire (1674) or Essonne (1678) — fail because these streams are located below the level of Versailles. The Eure, on the other hand, offers a favorable elevation (80 feet above the castle), but its capture requires a pharaonic structure, combining underground canals and aerial aqueducts. The site of Maintenon, close to the eponymous castle, is chosen to cross the valley, symbolizing the daring and the limits of royal engineering.

Vauban, despite his reluctance, participates in the surveys and proposes optimizations to reduce costs and improve flow. His plans, rejected by Louvois, illustrate the conflicts between technical pragmatism and the will of glory. The king favors a spectacular aqueduct, reflecting his ambition to master nature. The abandonment of the project in 1689, after only three years of work, marked a turning point: priority went from large civilian construction sites to the war effort, leaving the pipeline as a vestige of an unfinished dream.

Today, the classified work — with its funnels registered in 1934 — attracts for its architecture and history. It recalls the hydraulic stakes of Versailles, where fountains, symbols of power, consumed up to 9,500 m3 of water in a few hours. The Eure Canal, though partially dug, remains a testimony to the logistical challenges of the Great Century, where water, a strategic resource, shaped landscapes and power relations.

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