Lai da Nalps

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Lai da Nalps
Val Nalps
Val Nalps
Location: canton of Grisons
Tributaries: Various mountain streams
Drain: Rein there Nalps
Lai da Nalps (Canton of Graubünden)
Lai da Nalps
Coordinates 701 437  /  165439 coordinates: 46 ° 37 '57 "  N , 8 ° 45' 48"  O ; CH1903:  701 437  /  165439
Data on the structure
Lock type: Arch dam
Construction time: 1962
Height of the barrier structure : 127 m
Height above the river bed : 122 m
Building volume: 594 000  m³
Crown length: 480 m
Operator: Kraftwerke Vorderrhein AG / Ovra Electrica Rein Anteriur SA
Data on the reservoir
Altitude (at congestion destination ) 1908  m above sea level M.
Water surface 91 ha
Reservoir length 2 km
Storage space 44 500 000  m³
Total storage space : 45 100 000  m³
Catchment area 22.3 km²
Design flood : 150 m³ / s
Map Lai da Nalps.png
Detailed map

The Lai da Nalps is a reservoir in Val Nalps in the canton of Graubünden in the municipality of Tujetsch . Together with the Lai da Sontga Maria and Lai da Curnera reservoirs , which are located in neighboring valleys, it forms a single water management system connected by pipes.

The reservoir can be reached from the Vorderrheintal . The last larger town is Sedrun . From this village a mountain road leads south to the lake, which is, however, subject to a general driving ban.

The road is not maintained in winter, so from December to May the Nalps weir can only be reached with a private cable car, which is open to everyone from July to October as far as the intermediate station Tgom (in winter on request).

The dam is monitored fully automatically by means of a system of permanently installed lasers and reflectors, also in order to detect possible deformations due to the construction of the Gotthard base tunnel , which runs under the dam, at an early stage.

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