Coming from Grenoble,
head towards Vizille, then take the D1085 (Route de Laffrey) and continue for 10 km.
Cross Laffrey and go on for around 3 km until Petichet : at the traffic light, turn left and then straight on for 400m.
At the crossroads, turn left and drive 700m more across the woods.
In front of the lake, turn right.
You are there !