Lac de Grand Maison

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Lac de Grand Maison
Retour Lac de Grand Maison (5).JPG
Location Isère
Coordinates 45°12′20″N 6°7′30″E / 45.20556°N 6.12500°E / 45.20556; 6.12500Coordinates: 45°12′20″N 6°7′30″E / 45.20556°N 6.12500°E / 45.20556; 6.12500
Type artificial
Primary inflows Eau d'Olle
Basin countries France
Surface area 2.19 km2 (0.85 sq mi)
Max. depth 90 m (300 ft)
Surface elevation 1,698 m (5,571 ft)

Lac de Grand Maison is a lake in Isère, France. At an elevation of 1698 m, its surface area is 2.19 km². It is created by the Grand'Maison Dam and serves as the upper reservoir in a pumped-storage hydroelectric scheme.