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).

Gelmersee is located in Canton of Bern
LocationGrimsel, Bernese Oberland
Coordinates46°36′58″N 8°19′56″E / 46.61611°N 8.33222°E / 46.61611; 8.33222Coordinates: 46°36′58″N 8°19′56″E / 46.61611°N 8.33222°E / 46.61611; 8.33222
Catchment area16.0 km2 (6.2 sq mi)
Basin countriesSwitzerland
Surface area0.645 km2 (0.249 sq mi)
Max. depth48 m (157 ft)
Water volume13 million cubic metres (11,000 acre⋅ft)
Surface elevation1,850 m (6,070 ft)

The reservoir may be reached by the Gelmerbahn from Handegg, Guttannen at 1,412 m. The funicular's track with a length of 1,028 m has a maximum inclination of 106%.

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