Saint Guérin, patron of the herds, gave his name to the valley and to the dam built between 1957 and 1961. It contributes to filling Roselend by means of a connecting pipe between the reservoirs which function like communicating vessels.

Its water surface is 50 ha and its depth of 70m for a capacity of 13 million m3. Its thin vaulted structure is 250m long. Each year it receives the equivalent of twice its storage capacity.

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The pedestrian route, accessible to all (people with accompanied reduced mobility) runs along the lake, on the right bank to a Himalayan footbridge 83m in span, and more than 20m high, allowing you to cross the Poncellamont Gorge.


Individual visit services

  • Unguided individual tours permanently

Group visits services

  • Unguided group tours permanently


From June 01 to October 18
Monday Open
Tuesday Open
Wednesday Open
Thursday Open
Friday Open
Saturday Open
Sunday Open

Equipments and Services


  • Public toilets
  • Parking nearby


  • Motorhomes allowed
  • Tourist information

Reduced mobility

Adapted tourism

  • Wheelchair accessible with assistance
  • Decline> 5% but reasonable

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Historic site and monument

Gittaz dam


Historic site and monument

Roselend Dam and Site


Saint Guérin lake.