Groenmolen

Groenmolen is a historic watermill in Alken, in the Belgian province of Limburg, standing on the banks of the Nieuwe Herk (New Herk) river. It is a grain mill of the undershot type, meaning its wheel is turned by water striking it below the axle — a design well suited to the flat, gently flowing streams typical of this part of Flanders.

How old is the mill?

Groenmolen already appears on the Ferraris map, drawn up between 1771 and 1777, and later on the Atlas of the Buurtwegen (local roads) from 1844. This places the mill's existence at this location no later than the mid-1770s, meaning it has stood by the Nieuwe Herk for at least two and a half centuries. The Ferraris survey remains the oldest confirmed cartographic evidence of the structure, even if the mill itself may date back somewhat earlier.

For generations afterward, the mill served its core purpose: grinding grain for the farms and residents of Alken and the surrounding area. This long, continuous record of use makes Groenmolen a valuable piece of evidence for the development of small-scale milling industry in what is now the province of Limburg.

What changed in the 20th century?

The most significant transformation took place between 1943 and 1944, when the mill's original half-timbered buildings — structures with a visible wooden frame filled with other material — were replaced by the stone buildings that stand today. This was more than a cosmetic change: stone walls proved far more durable against the persistent dampness that comes with standing so close to running water.

A year later, in 1945, the mill wheel itself was replaced. The old wooden wheel gave way to a metal one sourced from another mill, the Mombeekmolen. Moving technical components between mills in this way was not unusual at the time, particularly when original equipment had worn out or been damaged and installing a proven wheel from elsewhere was more practical than reconstructing an identical one on site.

When did the mill stop working, and what happened next?

Groenmolen ceased regular production milling in 1970. Even so, the machinery was never allowed to fall into total disrepair — it remained, and still remains, mechanically capable of grinding grain, even though it is no longer operated commercially.

A turning point for the mill's future came in 2004, when it was acquired by the company TEAM CVBA SO, led by director Ann Debock. Among the five shareholders behind this initiative was the local employment agency (PWA) of the municipality of Alken, underlining the community-driven, heritage-preserving character of the venture rather than a purely commercial use of the property.

The following year, in 2005, restoration work was carried out. A group of milling enthusiasts took on the repairs, led by Frans Van Nuffel. Thanks to this local, volunteer-driven effort, Groenmolen survives today as a tangible witness to the region's historic water-milling infrastructure.

Why visit Groenmolen?

For anyone interested in the history of technology and traditional craftsmanship, Groenmolen offers a concrete example of a watermill's evolution — from an 18th-century half-timbered structure, through a post-war rebuild in stone, to present-day conservation efforts driven by the local community. Its picturesque setting on the banks of the Nieuwe Herk also gives the site scenic appeal typical of the quiet, rural landscape of Limburg.

Frequently asked questions

Is Groenmolen still operational? It has not been used commercially since 1970, but the preserved mechanism can still grind grain, and the mill is maintained through ongoing restoration work.

How old is the mill? The oldest confirmed record of its existence comes from the Ferraris map of 1771–1777, making it at least 250 years old.

Who manages the mill today? Since 2004, it has been owned by the company TEAM CVBA SO, with the local employment agency of Alken among its shareholders.