The Ecouges valley is accessed via a picturesque little road from Saint-Gervais. Along the narrow road, you can admire a magnificent waterfall. Towards the end, you enter a tunnel carved into the rock. It is now a two-way tunnel: two islands allow vehicles to pass each other. Shortly after the tunnel, take a small bridge on the left (Pont Chabert) and you can park on the right (fairly large car park).
(S/E) Leave the car park heading north to enter the valley (there are signs). It is easy to find your way: follow a wide forest track that climbs gently and steadily, ignoring the paths on the right. You will pass Les Molières,
(1) Oratoire du Versoud. You will arrive at Le Rivet.
(2) Then turn right (east) and follow the signs for "Fessole" and "Pas de la pierre Taillée". The path climbs steeply at this point.
(3) Ignore the path on the right towards Pas de Montbrand (sign) and turn left (east). The forest track will take you to the sheepfold at Pré Fessole.
(4). Then head south-east towards Pas de la Pierre Taillée, which you will reach in about half an hour from Fessole.
(5) To return, take the same path, which will allow you to see things differently (S/E).
Please note: the alternative route that used to exist after Pré Fessole, allowing you to return in a circular manner, is no longer maintained (it is even discouraged by park rangers).