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Gigerwaldsee in the Calfeisental
Gigerwaldsee in the Calfeisental
Location: Canton of St. Gallen
Tributaries: Tamina , Tellerbach , Hoch Bach
Drain: Tamina
Larger places on the shore: St. Martin
Gigerwaldsee (Canton of St. Gallen)
Coordinates 747 367  /  197 712 coordinates: 46 ° 54 '51 "  N , 9 ° 22' 24"  O ; CH1903:  747 367  /  197 712
Data on the structure
Lock type: Arch dam
Construction time: 1976
Height of the barrier structure : 147 m
Height above the river bed : 135 m
Building volume: 460 000  m³
Crown length: 430 m
Operator: KW Sarganserland AG, Pfäfers
Data on the reservoir
Altitude (at congestion destination ) 1335  m above sea level M.
Water surface 71 ha
Reservoir length 3 km
Storage space 33 400 000  m³
Total storage space : 35 600 000  m³
Catchment area 52.06 km²
Design flood : 180 m³ / s
Map Gigerwaldsee.png
Detailed map

The Gigerwaldsee is located in the Calfeisental in the area of ​​the political community Pfäfers in the canton of St. Gallen .


The reservoir can be reached via Bad Ragaz through the Tamina valley . The last larger town is Vättis . From there, a mountain road and, on summer weekends, a post bus route lead to the dam wall , which was completed in 1976 and about 400 meters higher . Along the southern shore of the lake, a narrow road leads through some tunnels to the former Walser settlement of St. Martin . The road is closed in winter due to the risk of avalanches. The Gigerwaldsee is the largest lake that lies exclusively in the St. Gallen area.

The Gigerwaldsee is part of the pumped storage plant built by Kraftwerke Sarganserland (KSL) from 1971 to 1977 , a partner plant of the Canton of St. Gallen and Axpo AG . It uses water from the upper Weisstannental and its side valleys, the Calfeisental and the Tamina valley and generates an average of 460 million kilowatt hours of electricity annually.

Technical specifications

Gigerwald dam

Double curved arch dam
Maximum height above foundation 147 m
Crown length 430 m
Minimal wall thickness at the crown 7 m
Maximum wall thickness at the foot 22 m
Height of the wall crown 1337  m above sea level M.
Concrete cubature 446,000 m³

Hydraulic equipment

Mapragg power plant Sarelli power plant
Turbines 3 vertical axis Francis turbines 2 vertical axis Francis turbines
Turbine power 93 300  kW each 45,000 kW each
rotational speed 600 rpm 750 rpm
Swallowing ability 25 m³ / s each 15 m³ / s each
pump 3 vertical axis two-stage pumps
Pump performance 53,000 kW each
Delivery rate 8.6 to 11.9 m³ / s each


Web links

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

Individual evidence

  1. a b c Information board at the Gigerwald dam