There were at one time 6 mills on the Zwenewaldbach in Hopfgarten to process grain. One of them, Böckn Mühle, dating from 1917, has been preserved. It is located right on the Hopfgarten water theme trail. In the summer months the mill is operated every Thursday from 4 p.m. to 6 p.m. The freshly milled wheat and rye flour is also available to purchase.