| Lac de Grand Maison | |
|---|---|
.JPG) | |
  Lac de Grand Maison | |
| Location | Isère |
| Coordinates | 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 km (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 km. 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.
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