Gelmersee (or Lake Gelmer) is a reservoir in Bernese Oberland, Switzerland. The hydroelectric reservoir was completed in 1932, at about the same time as the Grimselsee reservoir, and both are operated by Kraftwerke Oberhasli. The reservoir's volume is 13 million m³ and its surface area 64.5 ha (159 acres).
|Location||Grimsel, Bernese Oberland|
|Catchment area||16.0 km2 (6.2 sq mi)|
|Surface area||0.645 km2 (0.249 sq mi)|
|Max. depth||48 m (157 ft)|
|Water volume||13 million cubic metres (11,000 acre⋅ft)|
|Surface elevation||1,850 m (6,070 ft)|
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