Mill day in the Achertal: tradition, hydropower and delights visitors!
Experience the German Mill Day on June 9, 2025 in Ottenhöfen – with historic mills, guided tours and lively demonstrations.

Mill day in the Achertal: tradition, hydropower and delights visitors!
Today, June 9, 2025, numerous visitors flocked to the mill paths in Ottenhöfen and Seebach in the Black Forest to celebrate German Mill Day. The event, which has already become a tradition, not only offers an insight into the function and history of the mills, but also numerous cultural offerings that keep the legacy of this ancient craft alive. Bathing Online reports that the Benz Mill in Unterwasser, whose history may be older than 1799, was particularly popular due to its remote location.
In Ottenhöfen there was a hammer forge and six grinding mills to visit, while in Seebach three grinding mills and the Silbergründle ore mine awaited visitors. A highlight for many was the steam locomotive 58311, which pulled fully occupied trains to Ottenhöfen twice. The mayor and a folk dance and traditional costume group welcomed the guests at the train station, which underlined the special ambience of the event.
Cultural programs and technical demonstrations
The tours and demonstrations in the mills attracted many interested people. In particular, the Benz mill, which was recently renovated, received an informative presentation from miller Werner Benz. This mill, which was used for contract grinding until the 1960s, also relied on hydropower to generate electricity in the first half of the 20th century. The condition of the mill wheel and water barge is in good condition despite the patina.
The technique of forging with water power was also demonstrated in the hammer forge. The traditional costume and folk dance group also put on attractive performances in the Kopp Mill, while traditional demonstrations took place in Vollmers Mill and the mayor encouraged those present to take part. The tractor friends arrived at Vollmers Mühle with 20 tractors, which further enriched the event.
Challenges for hydropower
In the context of Mill Day, attention is drawn to the challenges that many mills are currently having to overcome. According to a report by BR.de Michael Pfannes, miller at Hagenmühle, complains about a continuous decline in water volumes, which endangers the use of hydropower. If hydropower is not enough, he has to switch to electricity. This problem not only affects him, but also many mill owners whose operations depend on electricity generation.
The Bavarian State Association of the Society for Milling Science and Mill Maintenance is planning measures to better promote the use of hydropower with Mill Day. Given the current climate crisis, the efficient use of every kilowatt hour of electricity is important. Historic mills, particularly those with water wheels and dams, must be protected as crucial elements of regional energy production and cultural identity.
Overall, the 30th German Mill Day offered a comprehensive program that not only underlined the historical relevance of the mills, but also promoted interest in sustainable hydropower in times of climate change. The event remains an important event for those interested in technology, nature lovers and cultural workers who are committed to preserving this traditional craft technique.