4.7
(69)
5,942
riders
29
rides
Touring cycling around Réservoir De Grand-Maison offers routes through dramatic alpine landscapes in the Isère department of the French Alps. The area is characterized by the artificial Lac de Grand-Maison, situated at an elevation of 1698 meters, and surrounded by the towering mountain ranges of the Belledonne and Grandes Rousses massifs. The Grand'Maison Dam, a significant hydroelectric facility, is also a prominent feature, providing panoramic views.
Last updated: July 1, 2026
57
riders
29.6km
02:22
870m
870m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
19
riders
12.4km
01:01
390m
390m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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9
riders
7.03km
00:35
230m
230m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5
riders
15.2km
01:56
670m
670m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
293
riders
59.0km
04:52
1,890m
1,890m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Small resting place, great view.
2
0
Nice little place with restaurant, church and the Lacets de Montvernier. Further ascent possible.
2
0
Fantastic ascent, great views,
2
0
The descent from the Col du Glandon towards the north offers a striking view towards the valley, the Col de la Madeleine and the Mont Blanc massif.
0
0
The most recent (and last) water retention dam in France.
0
0
I do them on a mountain bike going down. Not very pleasant. I'll try it on a road bike going up.
0
0
There are over 25 touring cycling routes available around Réservoir De Grand-Maison. These routes traverse dramatic alpine landscapes, offering a variety of experiences for cyclists.
The routes around Réservoir De Grand-Maison cater to various skill levels. While there is 1 easy route, the majority are moderate (8 routes) or difficult (17 routes), reflecting the challenging alpine terrain and significant elevation changes in the region.
Yes, several routes are designed as loops, allowing you to start and finish at the same point. For example, consider the Grand Maison Shelter – View of Lac de Grand-Maison loop from barrage de Grand'Maison, which offers scenic views of the lake, or the more challenging Grand Maison Shelter – Iron Cross loop from barrage de Grand'Maison near the famous Col de la Croix-de-Fer.
The touring cycling routes around Réservoir De Grand-Maison are highly rated by the komoot community, with an average score of 4.7 stars from over 70 reviews. Cyclists often praise the breathtaking alpine scenery, the challenge of the mountain passes, and the impressive views of the reservoir and dam.
While the region is known for its challenging alpine terrain, there is 1 easy route available. For families or beginners, it's advisable to look for routes with minimal elevation gain and shorter distances. The area generally features moderate to difficult climbs, so careful route selection is key.
For advanced touring cyclists seeking a challenge, the Réservoir De Grand-Maison area is ideal, with 17 difficult routes. Many routes incorporate sections of legendary mountain passes like Col du Glandon and Col de la Croix-de-Fer. A demanding option is the Col de la Croix de Fer (Iron Cross Pass) – Refuge of the Étendard loop from Lac Saint-Nicolas, which features significant elevation gain.
The best time for touring cycling around Réservoir De Grand-Maison is typically from late spring to early autumn (June to September). During these months, the high mountain passes are usually clear of snow, and the weather is more favorable for cycling, offering stunning views of the alpine landscape.
Absolutely. The area is rich in impressive sights. The Grand'Maison Dam itself is an engineering marvel, offering panoramic views from its south side. The reservoir, Lac de Grand-Maison, provides spectacular reflections of the surrounding Belledonne and Grandes Rousses massifs. Routes often pass near or over famous mountain passes like Col du Glandon and Col de la Croix-de-Fer, which are renowned for their vistas.
Parking is generally available at key access points around the reservoir and near the Grand'Maison Dam, which serve as common starting points for many cycling routes. Specific parking availability can vary, so it's advisable to check local signage upon arrival.
Access to the high-altitude Réservoir De Grand-Maison area by public transport can be limited, especially for carrying bicycles. While some regional bus services might operate to nearby towns in the Isère department, direct connections to the reservoir itself are infrequent. It's often more practical to travel by car to a suitable starting point.
Given the alpine and somewhat remote nature of the Réservoir De Grand-Maison area, dedicated cafes or restaurants directly on the routes might be sparse. However, you may find options in nearby villages or at mountain refuges, particularly during peak season. It's always recommended to carry sufficient water and snacks, especially on longer rides.
Cycling around Réservoir De Grand-Maison during winter is generally not recommended for touring cyclists due to heavy snowfall, icy conditions, and the closure of high mountain passes. The area is at an elevation of 1698 meters, making winter conditions severe and unsuitable for most cycling activities. The best time to visit is typically from late spring to early autumn.


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