| Gelmersee | |
|---|---|
 | |
  Gelmersee  Gelmersee  Gelmersee | |
| Location | Grimsel, Bernese Oberland |
| Coordinates | 46°36′58″N 8°19′56″E / 46.61611°N 8.33222°E |
| Type | reservoir |
| Catchment area | 16.0 km2 (6.2 sq mi) |
| Basin countries | Switzerland |
| 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 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).
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%.