| Hohenfelder Mühlenau | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Schleswig-Holstein |
| Subdivision Type3: | District |
| Subdivision Name3: | Plön |
| Length: | 10 km |
| Source1 Location: | Source: Selenter See between Köhn-Pülsen and Giekau-Warderhof |
| Mouth Location: | Kiel Bay near Hohenfelde-Malmsteg |
| Basin Landmarks: | Villages: Köhn, Schwartbuck, Hohenfelde |
| River System: | Hohenfelder Mühlenau |
| Custom Label: | References |
The Hohenfelder Mühlenau is a stream, about long, in the district of Plön in northeast part of the North German state of Schleswig-Holstein.
The Hohenfelder Mühlenau is classified as a gravel-bedded stream. It begins at the Selenter See in Holstein and, together with the Salzau / Hagener Au, is one of its natural tailwaters.The course of the stream has an incline of about 4%, a length of, a width of generally between 2and and a depth of 0.1to. It is interrupted by two barriers, the mill at Köhn, which has fallen into ruins leaving just a foundation behind, and poses an obstacle of 2to. This hurdle will now be bypassed, in line with the EU Water Framework Directive, using a drop structure (Sohlgleite) which will be built next to the existing building. The Hohenfelde Mill is another obstacle of about, which is partly bypassed with a fish pass. The existing 50 hp Francis turbine is still an obstacle however.At the end of its course the Hohenfelder Mühlenau discharges into the Baltic Sea with a water quality class of I-II.