Hiking : Lake Fourchu
A classic hike for people living in Grenoble, where the large grassy meadows of the plateau and their multitude of lakes stand alongside the rocky summits.
Elevation gain: 420 m
Ascent time: 3h30
Start: Alpe du Grand Serre
Difficulty: Medium
Map: Top 25 IGN 3335 OTR Grenoble / Chamrousse / Belledonne
Trail map: “Pays du Valbonnais”
Route
From the Poursollet lake parking lot, follow the GR 50 trail that runs between the chalets and past the Bar du Taillefer. Continue climbing through alpine pastures and beneath the Rocher Culasson, which leads to the Taillefer plateau. Descend slightly to the left to reach Lac Fourchu. Return via the same path.
Details:
This family-friendly hike takes you to the heart of the Taillefer plateau, with its landscapes reminiscent of the Scottish Highlands. In contrast, the surrounding peaks — the Taillefer, Rocher Culasson, and Grand Galbert — create a strikingly alpine backdrop, while distant views open up onto the Oisans mountain range.
Route details
Path
From the parking lot of Lac du Poursollet, follow the GR 50 which passes between chalets, then in front of the Bar du Taillefer. Continue the climb, through the pastures then under the rock Culasson, which leads to the plateau of Taillefer. Go down slightly to the left to reach Lake Fourchu. Return by the same route.
Parking nearby
Opening
From 01/01 to 31/12 daily.
More details
Informations to download
Tips
The Lac Fourchu plateau is an incredibly rich but also incredibly fragile environment. Please respect this sensitive area (classified as NATURA 2000), as well as private property, by staying on the marked trails.
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Latitude : 45.053085
Longitude : 5.898008
Height : 1650
38350 Alpe Du Grand Serre
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Information updated on 09/10/2026
by Matheysine Tourisme
