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Lake of Mauvoisin

Lac de Mauvoisin
Mauvoisin.JPG
View of the lake from the dam, July 2008
Location Valais
Coordinates 45°59′53″N 7°20′58″E / 45.99806°N 7.34944°E / 45.99806; 7.34944Coordinates: 45°59′53″N 7°20′58″E / 45.99806°N 7.34944°E / 45.99806; 7.34944
Type reservoir
Primary outflows Dranse de Bagnes
Catchment area 113.5 km2 (43.8 sq mi)
Basin countries Switzerland
Max. length 4.9 km (3.0 mi)
Surface area 2.08 km2 (0.80 sq mi)
Max. depth 180 m (590 ft)
Surface elevation 1,961 m (6,434 ft)

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 1951–1957, and raised by 13.5 m in 1991.

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).

Mauvoisin Dam, with Mont Blanc de Cheilon in the background

Dranse de Bagnes, a stream flowing from the Mauvoisin lake



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