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 (constructed between 1978 and 1985) and serves as the upper reservoir in a pumped-storage hydroelectric scheme.

Lac de Grand Maison
Lac de Grand Maison
Location	Isère
Coordinates	45°12′20″N 6°7′30″E
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)

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[fr] Lac de Grand'Maison