Lac de Mauvoisin

Lac de Mauvoisin is a reservoir in the canton of Valais, Switzerland. The reservoir is formed by the Mauvoisin Dam, which is 250 m high. The dam is currently the 11th highest in the world, and the 6th highest arch dam. It was built in 19511957, and raised by 13.5 m in 1991.

Lac de Mauvoisin
View of the lake from the dam, July 2008
LocationValais
Coordinates45°59′53″N 7°20′58″E
Typereservoir
Primary outflowsDranse de Bagnes
Catchment area113.5 km2 (43.8 sq mi)
Basin countriesSwitzerland
Max. length4.9 km (3.0 mi)
Surface area2.08 km2 (0.80 sq mi)
Max. depth180 m (590 ft)
Surface elevation1,961 m (6,434 ft)

The reservoir lies in the upper Val de Bagnes, between the massif of the Grand Combin, one of the highest mountains of the Alps, and La Ruinette. The highest peak visible from the lake is the Combin de la Tsessette (4,135 m).

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