In recent years, extensive renaturation measures have been undertaken at the Maxmühle mill and in the municipalities of Bruckmühl, Bad Aibling, Kolbermoor, and Rosenheim, and these measures are to be continuously expanded. The weirs, some made of concrete and others of wood, which were installed in the riverbed to regulate the flow velocity, were already showing significant age-related damage.
Renatured section of the Mangfall River
Renatured section of the Mangfall River near Bad Aibling
Mangfall River in Kolbermoor, heading west
Confluence of the Mangfall and Inn Rivers in Rosenheim
The weirs were removed from the river and replaced with fish ramps. The primary goal is to facilitate fish migration, as the once fish-rich river currently only maintains a significant fish population through stocking efforts by fishing clubs.
In addition, the straightened banks of the Mangfall River have been reshaped to more natural characteristics, creating groyne-like structures that restore areas of slower flow along the banks. These are the natural habitats of fish fry and noble crayfish.
Due to the damming of its tributaries and the Mangfall River itself, it lacks sufficient sediment. Geologically, there are concerns that the ongoing deepening of the Mangfall's riverbed could lead to landslides on the unstable, steep right bank (before the "Mangfall Knee").