The Eper Mill or Wingbergermolen is a water mill in the hamlet of Terpoorten near Epen that, together with the Volmolen, uses the water of the Geul river. Shortly after the mill, the Camerigerbeek flows into the Geul. The building is a national monument. In 1844, the Eper Mill was built at the place where the Geul made a sharp bend, so that the water could flow straight to the mill. In the middle of the 19th century, the mill had an undershot wheel with a diameter of 5.4 meters and a width of 83 centimeters, which was renewed in 1854. In 1890, a gauge was placed at the mill by the Provincial Water Board and it was found that the mill had a different water wheel. The wheel turned out to be replaced by a crop wheel with a diameter of 5.7 meters and a width of 77 centimeters. A crop was added in front of the wheel, making it a medium stroke mill instead of a lower stroke mill. This greatly improved returns. In 1913, the owner received permission from the provincial government to replace the water wheel with a turbine. In 1914 the wheel was replaced by the cast iron turbine and the face of the mill was also changed. The turbine room was built above the mill branch against the side wall of the mill building.