4.7
(162)
12,306
riders
21
rides
Road cycling routes around Réservoir De Grand-Maison are situated in the Isère department of the French Alps, characterized by its alpine terrain. The region features the artificial Lac de Grand Maison, created by the Grand'Maison Dam, set at an altitude of approximately 5,571 feet (1,698 meters). Cyclists encounter challenging ascents near cols such as Col de la Croix de Fer and Col du Glandon, with flatter sections around the reservoir itself. The landscape is framed by the Belledonne and Grandes…
Last updated: July 1, 2026
5.0
(5)
147
riders
52.0km
03:25
1,600m
1,600m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
37
riders
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

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166
riders
59.3km
03:57
1,890m
1,890m
Hard road ride. Very good fitness required. You may need to push your bike for some segments of this route.
44
riders
27.0km
01:57
990m
990m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
5.0
(4)
192
riders
19.7km
01:19
640m
640m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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View towards the north and the superb descent of the Glandon, with the Madeleine pass in the distance.
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Beautiful church and small water spot.
2
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Grandiose ascent on the D110, great view at the pass.
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Great road and wonderful views.
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Nice little place with restaurant, church and the Lacets de Montvernier. Further ascent possible.
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Fantastic ascent, great views,
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Every cemetery has water... Drinkable or not 😂
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The road cycling routes around Réservoir De Grand-Maison offer a range of difficulties. Out of 25 routes, 4 are considered easy, 10 are moderate, and 11 are difficult. This means you can find options from challenging alpine climbs, often associated with cols like Col de la Croix de Fer and Col du Glandon, to flatter sections directly around the reservoir.
Yes, there are easier options available. While many routes involve significant elevation, 4 of the 25 routes are rated as easy. These routes typically offer a less strenuous experience, allowing beginners to enjoy the stunning alpine scenery without overly demanding climbs.
The terrain around Réservoir De Grand-Maison is predominantly alpine, characterized by significant elevation changes. You'll encounter challenging ascents leading to famous cols, but also flatter sections around the artificial Lac de Grand Maison itself. The landscape is framed by the majestic Belledonne and Grandes Rousses massifs, offering varied and scenic views throughout your ride.
Yes, many routes in the area are designed as loops, allowing you to start and finish in the same location. For example, the Chalet at Col du Glandon – Col de la Croix de Fer (Iron Cross Pass) loop from Le Rieu Claret is a popular moderate loop connecting two significant alpine passes.
Absolutely. The region is known for its challenging and longer routes, often incorporating multiple cols. For instance, the Montvernier – Lacets de Montvernier loop from Col du Glandon is a difficult 37.1-mile (59.7 km) path with significant elevation gain, ideal for experienced long-distance riders.
Yes, some routes provide spectacular panoramic views, including distant glimpses of Mont Blanc. The View of Mont Blanc – Great cafe at the Col de Glandon🤩 loop from Saint-Jean-d'Arves is a shorter route specifically highlighting such a viewpoint. Additionally, the impressive Grand'Maison Dam itself is a notable engineering marvel visible from many routes around the reservoir.
The best time for road cycling around Réservoir De Grand-Maison is typically during the warmer months, from late spring to early autumn (roughly June to September). During this period, the high mountain passes are generally clear of snow, and the weather conditions are more favorable. Winter cycling is not recommended due to snow and ice at high altitudes.
Parking availability varies by starting point. Many routes begin from villages or specific points near the cols, where designated parking areas can often be found. For routes starting from locations like Le Rieu Claret or Saint-Jean-d'Arves, you can usually find suitable parking to begin your ride.
While many routes involve significant climbs, the flatter sections directly around the Réservoir De Grand-Maison itself can be more suitable for families or those looking for a less strenuous ride. It's advisable to check the difficulty grade and elevation profile of specific routes to ensure they align with your family's cycling abilities.
Yes, especially on popular routes and near significant cols. For example, the View of Mont Blanc – Great cafe at the Col de Glandon🤩 loop from Saint-Jean-d'Arves explicitly mentions a great cafe at Col du Glandon. Many villages and pass summits in the region offer opportunities for refreshments.
The area is highly rated by the komoot community, with an average score of 4.6 stars from over 70 reviews. Cyclists frequently praise the majestic alpine scenery, the challenge of iconic climbs like Col de la Croix de Fer and Col du Glandon, and the impressive views of the artificial Lac de Grand Maison and surrounding massifs.
There are over 25 road cycling routes available around Réservoir De Grand-Maison. These routes offer a diverse range of distances, elevations, and difficulty levels, catering to various cycling preferences and fitness levels.
Yes, many road cycling routes in the area will take you past or near the impressive Grand'Maison Dam, which created the artificial Lac de Grand Maison. It's a significant landmark and an engineering marvel, offering unique views as you cycle through the high-altitude landscape.


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