The Grimselsee or Lake Grimsel is an artificial lake near the Grimsel Pass in the Canton of Berne, Switzerland. With a volume of 95 mio m³, it is larger than other hydroelectric reservoirs in the 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.

Lake Grimsel
Grimselsee Lake Grimsel is located in Canton of Bern
Grimselsee Lake Grimsel
Lake Grimsel
Karte Grimselsee.png
LocationGuttannen, Canton of Berne
Coordinates46°34′10.52″N 8°19′38.66″E / 46.5695889°N 8.3274056°E / 46.5695889; 8.3274056Coordinates: 46°34′10.52″N 8°19′38.66″E / 46.5695889°N 8.3274056°E / 46.5695889; 8.3274056
Typeartificial lake, hydroelectric reservoir
Primary inflowsOberaarbach, Treibtenbach
Primary outflowsAare
Catchment area74.4 km2 (28.7 sq mi)
Basin countriesSwitzerland
Surface area2.63 km2 (1.02 sq mi)
Water volume95 million cubic metres (77,000 acre⋅ft)
Surface elevation1,908 m (6,260 ft)
Lake Grimsel and Räterichsbodensee in the background.

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