This dam, which cannot be visited, will nevertheless offer a wonderfull point of view on surrounding mountains.
Accessible by walking via the trail n°6 only from Le Prec parking for this summer (Orelle hiking map). YOu can go to Le Prec parking by driving from Valmeinier.
Access by driving on the forest pist of "Prec", until the parking, then bt hiking around 1h to the barrage.
You can also sleep in the "Les Marches" refuge