Timeline

Heritage classified

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Origin and history

The Lucy Mill, located in Ribemont in the department of Aisne, is an iconic 19th-century building built in 1840 by miller Niay. This flour mill, the last surviving of the Oise Valley after World War I, is distinguished by its pink brick structure and oak frame. It is powered by a complex hydraulic system, including a Francis turbine installed around 1900, replacing an original blade wheel. Its dam, equipped with manual valves, regulates the flow of the Oise over a 1500 km2 watershed, subject to frequent flooding.

At the beginning of the 20th century, the mill was transformed into a cotton mill by Julien Daltroff, a Swiss industrialist specializing in yarn dyeing and mercerising. The business continued until 1978 under the brand La Cottonière de Lucy-Ribemont, before the site was bought in 1981 by the Bruyn family. It rehabilitates it for environmental uses (wetland engineering, training) and energy, while preserving its industrial heritage. Ranked a historic monument in 1993, the mill is open to the public during Heritage Days, offering a rare testimony of the regional textile and hydraulic industry.

The right to water of the mill, prior to the French Revolution, was redefined in 1852 after the construction of the Canal de la Sambre à l'Oise. This regulation sets the upstream level of the hold at 67.79 m NGF, maintained by a spillway and ten manual valves. These still operational developments illustrate 19th century hydraulic engineering, adapted to winter floods and summer storms. The Francis turbine, still in service, produces 40 kW of electricity, while the dam creates a deep pit of 5 to 6 meters, witness to centuries of milling and industrial activity.

The mill architecture combines robustness and functionality: 80 cm thick walls at the base, 90 blue stone arch windows from the Ardennes, and an oak frame supporting five levels. The site, located in the hamlet of Lucy, occupies the location of a medieval mill dependent on the Abbey of Saint-Nicolas-des-Prés from the 11th century. This historical continuity, coupled with its ecological conversion, makes it a symbol of the transition between industrial heritage and sustainable development.

The protection of the mill in 1993 covers its facades, roofs, the dam with its vanage, the Francis turbine and the remaining elements of the transmission system. These measures preserve a coherent technical set, where artisanal know-how (wood corner shipment) and industrial innovations (speed multiplier with belts). Today, Lucy's mill embodies both a millennial legacy and a successful adaptation to contemporary renewable energy production issues.

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