| Partnach | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Bavaria |
| Subdivision Type3: | District |
| Subdivision Name3: | Garmisch-Partenkirchen |
| Subdivision Type4: | Reference no. |
| Subdivision Name4: | DE: 1624 |
| Length: | 18km (11miles) |
| Source1 Location: | on the Zugspitze Massif |
| Source1 Coordinates: | 47.4061°N 11.0285°W |
| Source1 Elevation: | ca. 1,440 m |
| Mouth Location: | in Garmisch-Partenkirchen into the Loisach |
| Mouth Coordinates: | 47.4998°N 11.0883°W |
| Mouth Elevation: | ca. 690 m |
| Basin Size: | 129km2 |
| Custom Label: | References |
The Partnach is an 18adj=midNaNadj=mid mountain river in Bavaria, Germany.
It rises at a height of on the Zugspitze Massif. The Partnach is fed by meltwaters from the Schneeferner glacier some higher up. The glacier's meltwaters seep into the karsty bedrock and reach the surface again near the source of the Partnach.
The Partnach then flows down the Reintal valley. Until 2005 there were two mountain lakes here – the Vordere Blaue Gumpe and the Hintere Blaue Gumpe. At the first lake the water of the Partnach was impounded by scree from rock slides. As a result of heavy rain the natural dam, caused by rockfalls, was partially carried away and the lake was completed filled with sediment. As a result, the Blaue Gumpe does not exist any longer today.
The Partnach has the following tributaries which join it at or near the river kilometre shown in brackets: