From the centre of the village of Châtel, drive towards Pré la Joux. Park in car park no. 5, at the side of the road, just before the Pré la Joux chairlift station.
(S/E) From the car park, cross the Drance and take thefirst pathon the left, towards the recycling centre. Continue along this path, skirting the recycling centre at the bottom, until you reach the signposts.
(1) Turn right towards “Sous le Va”. The path climbs very steeply through the forest.
(2) When you reach a clearing, head up past the Sous le Va hut until you reach a track.
(3) Turn right towards “Tête de la Bille” and continue along this track to the reservoir.
(4) Walk round the reservoir. There are two picnic tables available. Head back down to the car park by following the route in reverse to the one you took on the way up (S/E).