|Coordinates||668 448 / 163151|
|Data on the structure|
|Lock type:||Gravity dam|
|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|
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.