| Grimselsee Lake Grimsel | |||||
| Image Bathymetry: | Karte Grimselsee.png | ||||
| Caption Bathymetry: | map | ||||
| Location: | Guttannen, Canton of Bern | ||||
| Coords: | 46.5696°N 8.3274°W | ||||
| Type: | artificial lake, hydroelectric reservoir | ||||
| Inflow: | , Treibtenbach | ||||
| Outflow: | Aare | ||||
| Catchment: | 74.4km2 | ||||
| Basin Countries: | Switzerland | ||||
| Area: | 2.63km2 | ||||
| Volume: | 95e6m3 | ||||
| Elevation: | 1908m (6,260feet) | ||||
| Pushpin Map: | Canton of Bern#Switzerland#Alps | ||||
| Pushpin Label Position: | bottom | ||||
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The Grimselsee or Lake Grimsel is an artificial lake near the Grimsel Pass in the Canton of Bern, Switzerland. With a volume of 95 mio m³ (20.9 billion imperial gallons, 20.1 billion US gallons), it is larger than other hydroelectric reservoirs in the Aare headwaters region: Oberaarsee, Räterichsbodensee and Gelmersee. The dam was completed in 1932 and is operated by Kraftwerke Oberhasli AG (KWO). It is located in the municipality of Guttannen.