From Jausiers, take the road to the Col de la Bonnette. Just before the hamlet of Lans, turn left onto the Vallon des Sagnes track. About ten kilometres further on, park in the small car park.
(S/E) Cross the bridge over the Torrent d’Abriès, then walk along the left-hand side of the lake, following the path which, at the start, passes in front of the small hydroelectric power station and leads to the Vallon de Pelouse.
(1) A little further up the valley, turn right. The path becomes a bit overgrown and is less obvious to follow in places, but it is easy to make out. Cross the Torrent d’Abriès, navigate a few hairpin bends, then head north to the Col de Pelouse (2,553 m).
(2) From the pass, head towards the Cime de Pelousette (2,757 m) along a better-marked path. Reach the summit, where you’ll find the ruins of the Fortin de Pelousette.
(3) After exploring the ruins, go round the fort heading east. Ignore the path on the right which descends to the Col des Fourches and reach the Col de Pelousette (2,720 m).
(4) Turn left to descend to the path leading to Lac de Pelouse, taking great care as this section is off-trail. Follow this path to the right to reach the lakeshore.
(5) From the far end of the lake, continue down into the valley, heading north-west.
(1) Carry on straight ahead along the path you took on the way up to reach the car park (S/E).