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Oberaar reservoir and glacier
Oberaar reservoir and glacier
Location: Bernese Oberland
Tributaries: various mountain streams
Drain: Oberaarbach
Oberaarsee (Canton of Bern)
Coordinates 663 091  /  155127 coordinates: 46 ° 32 '40 "  N , 8 ° 15' 40"  O ; CH1903:  six hundred and sixty-three thousand and ninety-one  /  155127
Data on the structure
Lock type: Gravity dam
Construction time: 1953
Height of the barrier structure : 100 m
Height above the river bed : 90 m
Building volume: 453,000 m³
Crown length: 526 m
Operator: Kraftwerke Oberhasli AG, Innertkirchen
Data on the reservoir
Altitude (at congestion destination ) 2303  m above sea level M.
Water surface 1.46 km²
Reservoir length 2.8 km
Maximum depth 90 m
Catchment area 19.4 km²
Design flood : 21 m³ / s
Map Oberaarsee.png

The Oberaarsee is the highest reservoir in the headwaters of the Aare in the canton of Bern ( Guttannen municipality ). It is located below the Oberaar Glacier . It is followed by the Aare reservoirs Grimselsee and Räterichsbodensee , two more of several reservoirs that feed the hydropower plants of Kraftwerke Oberhasli AG.

The lake can be reached with vehicles from the Grimsel Pass on a one-way street (change of direction every half hour), from which the Unteraar Glacier and the Grimselsee can be clearly seen. A power station's own cable car also leads to the dam in winter.


The construction of the dam lasted until 1953.


The lake has a storage volume of 65 million m³.

Web links

Commons : Oberaarsee  - collection of images, videos and audio files