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.
Visit
Individual visit services
- Unguided individual tours permanently
Group visits services
- Unguided group tours permanently
Opening
| From June 01 to October 18 | |
| Monday | Open |
| Tuesday | Open |
| Wednesday | Open |
| Thursday | Open |
| Friday | Open |
| Saturday | Open |
| Sunday | Open |
Equipments and Services
Reduced mobility
Adapted tourism
- Wheelchair accessible with assistance
- Decline> 5% but reasonable
