|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)|
Gelmersee (or Lake Gelmer) is a reservoir in Bernese Oberland, Switzerland. The hydroelectric reservoir was built at the same time as Grimselsee,[when?] and is operated by Kraftwerke Oberhasli. The reservoir's volume is 13 million m³ and its surface area 64.5 ha (159 acres).
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