The Tré-les-Eaux site is the second intake of the West collector and is a standard water intake capturing all water from the Vallon de Tré-les-Eaux.
Technical file
| Construction year | 1967-1973 |
| Put into operation | 1975 |
| Municipality | Vallorcine |
| Altitude | 1970m. |
| Type | Water intake |
| Flow | 4.5m³/sec |