Theunissenmolen

Theunissenmolen is a historic watermill on the Bosbeek stream, near the village of As in the Belgian province of Limburg. Also known as Oude Molen (Old Mill), it stood at the heart of the local rural economy for centuries and remains one of the area's most recognizable heritage landmarks.

How old is this mill?

The earliest written record of the mill dates back to 1470, making it one of the older surviving mill sites in the region. From that time until 1710, the Oude Molen was the only mill operating within the municipality of As — it was only in 1710 that a second one, known as 't Mieleke, was established nearby. For more than two centuries, this gave the Theunissenmolen a central role in the community: local farmers brought their grain here to be ground, and the mill functioned as a natural economic hub for the settlement.

How does the mill work?

Theunissenmolen is classified as an overshot watermill: water from the Bosbeek is channeled above the wheel and falls onto it from the top, using gravity rather than the current's direct push to set it in motion. This design, common on small, gently flowing streams, generally delivers more efficient power than undershot wheels driven purely by the force of the water passing beneath them. The mill served as a grain mill, processing cereal into flour for surrounding farms.

Where does the current building come from?

The brick structure visitors see today dates from 1872, replacing earlier construction from previous centuries. In 1966, the mill underwent a renovation that kept it in good technical condition for continued use in the decades that followed.

When did the mill stop working?

The mill remained in productive use until 1976, when it was finally taken out of service. Rather than falling into disrepair, it was granted heritage protection status in 1993, safeguarding both the building itself and its immediate surroundings — including the distinctive water wheel and the intake channel drawing water from the Bosbeek.

What can visitors see on site?

Visitors can admire the mill's characteristic brick structure together with its external water wheel, set within the quiet landscape of the Bosbeek valley. The site combines historical interest with a peaceful, rural setting typical of the Limburg countryside, making it a pleasant short stop for anyone exploring the area around As.

Frequently asked questions

Where exactly is Theunissenmolen located? The mill sits on the Bosbeek stream near the village of As, in the Belgian province of Limburg, along Oude Molenweg.

Is the mill still operational? No — production ended in 1976. The site has been protected as a heritage monument since 1993.

What type of mill is it? It is an overshot watermill, where water falls onto the wheel from above rather than pushing it from below or the side.

Why was this mill historically significant? Because from at least 1470 until 1710 it was the only mill in the municipality of As, making it the central grain-grinding point for the entire surrounding area.