| Lac de Mauvoisin | |
|---|---|
| View of the lake from the dam, July 2008 | |
| Location | Valais |
| Lake type | reservoir |
| Primary outflows | Dranse de Bagnes |
| Catchment area | 113.5 km² |
| Basin countries | Switzerland |
| Max. length | 4.9 km |
| Surface area | 2.08 km² |
| Max. depth | 180 m |
| Surface elevation | 1,961 m |
Lac de Mauvoisin is a lake in the canton of Valais, Switzerland. The reservoir is formed by the Mauvoisin Dam, which is 250 m high. The dam is currently the 8th highest in the world, and the third highest arch dam. It was built in 1951–1957, and raised by 13.5 m in 1991. The reservoir lies in the upper Val de Bagnes, to the east of the Grand Combin.