Bilzermolen

Bilzermolen is a historic watermill on the Demer river in Bilzen, a town in the Belgian province of Limburg. It stands on Kattebroekstraat, on the eastern edge of Haffmans Park (also known as Demer Park), and is currently owned by the city of Bilzen. The mill was originally driven by an undershot waterwheel, a design well suited to the slow, gentle current of a lowland river like the Demer.

How old is the mill?

The site's history reaches back to the Middle Ages: the earliest written record of a mill here dates from 1301. Over the following centuries the building was rebuilt and repaired many times, which is typical for watermills — constant use and exposure to moisture meant few such structures survived unchanged for long. As a result, the mill remained in more or less continuous use for over six hundred years, passing through many hands and rebuilds along the way.

Why is it also called "Bouchoutmolen"?

A document from 1569 refers to the mill as Bouchoutmolen, likely named after a nearby estate or family called Bouchout with which it was associated at the time. Dual naming like this was common for mills in the region: they were often known by the name of their current leaseholder, the local landowner, or a nearby estate, and the name could shift across generations of operators.

Who worked the mill through the centuries?

Bilzermolen was one of four so-called "ban mills" (compulsory mills) in Bilzen during the Ancien Régime — meaning local residents were legally required to have their grain ground there, guaranteeing the leaseholder steady income while placing the mill under close administrative control. After 1600, a succession of milling families ran the operation: the Castermans, Maurissen, Martens and Withofs families. They worked as private operators, paying an annual rent to the Princely Episcopal Audit Office, the administrative body tied to the Prince-Bishopric of Liège, which governed this area at the time.

What happened to the mill in more recent history?

In 1893 the building suffered serious damage, but it was repaired fairly quickly and returned to service. The mill continued operating commercially — grinding grain at an industrial scale — until roughly the Second World War, when, like many similar mills across Europe, it gradually lost economic relevance to larger, mechanized milling operations.

What can visitors see today?

Today Bilzermolen forms part of the landscape of a municipal park along the Demer, combining its role as a historic technical monument with that of a landmark along riverside walking routes. Set within the park grounds, the mill is easily reached on foot from the center of Bilzen, and the surrounding Demer Park is a popular spot for walks and recreation among locals.

Frequently asked questions

Does Bilzermolen still grind grain? No — regular commercial milling ended around the time of the Second World War; today the building serves as a heritage landmark.

Where exactly is the mill located? On Kattebroekstraat, within Haffmans Park (Demer Park) in Bilzen, along the Demer river.

Why does the mill have a second name? A 1569 record calls it Bouchoutmolen, a name likely linked to a nearby estate or family called Bouchout.

Who operated the mill historically? Millers leased it and paid rent to the Princely Episcopal Audit Office; after 1600 the Castermans, Maurissen, Martens and Withofs families ran it in succession.