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Location: Bernese Oberland , Switzerland
Tributaries: various mountain streams
Gelmersee (Canton of Bern)
Coordinates 668 448  /  163151 coordinates: 46 ° 36 '58 "  N , 8 ° 19' 56"  O ; CH1903:  668 448  /  one hundred sixty-three thousand one hundred fifty-one
Data on the structure
Lock type: Gravity dam
Construction time: 1929
Height of the barrier structure : 35 m
Height above the river bed : 48 m
Height of the structure crown: 1850  m above sea level M.
Building volume: 82,000 m³
Crown length: 370 m
Operator: Kraftwerke Oberhasli AG, Innertkirchen
Data on the reservoir
Water surface 64.5 ha
Reservoir length 1.5 km
Catchment area 16 km²
Design flood : 87 m³ / s
Map Gelmersee.png
Detailed map

The Gelmersee was built at the same time as the Grimselsee (until 1929). The Gelmersee has a usable volume of 13 million m³ and is located at 1850  m above sea level. M. , about 50 m lower than the Grimselsee. The water comes partly from the Grimselsee (via a tunnel connection) and partly from the catchment area around the Gelmersee. The water is used in the Handegg 1 power station.


The Gelmerbahn operated by Kraftwerke Oberhasli AG , the steepest funicular in Europe with 106% , goes to the Gelmersee .

A white-red-white marked mountain path leads around the Gelmersee . On the north bank, the path was carved into the steep rock face. The most dangerous places are secured by ropes. However, absolute surefootedness is a prerequisite. The path is unsuitable for small children. Streams can block the way during the snowmelt. The lake hike takes about two hours.

A (much smaller) lake already existed at the site before the dam was built.

Technical data of the dam

The Gelmer dam is a 35 m high weight dam with a volume of 81,000 m³ and a crown length of 370 m.

The storage volume of the Gelmersee is 14 million m³.

Web links

Commons : Gelmersee  - Collection of images, videos and audio files