Barrage de Plan Carré – A Hidden Alpine Gem in Rhône‑Alpes
If you think the French Alps are only about ski lifts and mountain peaks, think again. Tucked away at 1 604 m above sea level, the Barrage de Plan Carré offers a quiet, off‑the‑beaten‑path experience for hikers, photographers, and anyone who loves the gentle roar of water against stone. Below we’ll explore why this modest dam in Allevard deserves a spot on your Rhône‑Alpes itinerary.
About Barrage de Plan Carré
Located at 45.348874 N, 6.156397 E in the commune of Allevard, the Barrage de Plan Carré is a functional dam that also serves as a scenic viewpoint. While the exact height of the structure isn’t publicly listed, its altitude of 1 604 m places it among the higher‑lying water‑holding works in the French Alps.
The dam was built to regulate the flow of mountain streams that feed the larger river systems downstream. Though its primary purpose is hydro‑technical, the engineers designed the crest to be walkable, allowing visitors to stroll along the concrete surface and take in panoramic vistas of the surrounding peaks and valleys.
Because there is no dedicated Wikipedia entry, the Barrage de Plan Carré remains a well‑kept secret—a fact that adds to its allure. The site is especially popular among local hikers who enjoy a short, rewarding walk to a spot where the water glistens like a mirror against a backdrop of alpine meadows.
Why It Matters
- Hydro‑tourism: The dam showcases France’s commitment to sustainable water management in high‑altitude environments.
- Scenic value: The combination of clear mountain water, rugged rock faces, and distant snow‑capped summits creates a photographer’s dream.
- Accessibility: Unlike many alpine dams that sit behind fences, the Plan Carré crest is open for pedestrian traffic, making it a safe, family‑friendly destination.
How to Get There
By Car
- From Lyon – Take the A43 motorway toward Chambéry, exit at Le Pont‑de‑Bois (exit 9). Follow the D1090 south, then turn onto the D90 heading for Allevard.
- From Grenoble – Follow the N85 “Route des Grandes Alpes” eastward, then branch onto the D1090 and continue as above.
The final stretch from Allevard village to the dam is a well‑marked mountain road that winds up to the reservoir. Parking is available at a small lot near the trailhead; from there it’s a short walk (approximately 10‑15 minutes) to the dam’s crest.
By Public Transport
- Train: Take the TER Auvergne‑Rhône‑Alpes line to Allevard‑Les Bains station.
- Bus: From the station, catch the local bus line C5 toward Plan Carré (check the latest schedule on the SIVOM transport website). The bus drops you off at the trailhead.
By Bike or Foot
For the adventurous, the GR5 long‑distance trail passes near Allevard. You can join the GR5 at Saint‑Claude and follow the marked side‑paths to the dam. The route is moderate, with a steady ascent to the 1 600 m plateau.
Best Time to Visit
| Season | Conditions | Why Visit |
|---|---|---|
| Spring (April‑June) | Snow melt feeds the reservoir, creating higher water levels and vivid green meadows. | Ideal for wildflower photography and gentle hiking. |
| Summer (July‑September) | Warm days, clear skies, and fully open trails. | Perfect for families and longer day‑trips; the water is calm, making the dam’s reflection spectacular. |
| Autumn (October‑November) | Golden foliage, crisp air, fewer crowds. | Great for sunrise shots; the low angle of the sun accentuates the dam’s texture. |
| Winter (December‑March) | Snow covers the surrounding peaks; the dam may be partially inaccessible. | For experienced winter hikers with proper gear; the landscape is dramatic but check local weather alerts. |
Overall recommendation: Late spring to early autumn offers the most reliable access and the best combination of weather, water level, and trail conditions.
What to Expect
When you step onto the concrete walkway of Barrage de Plan Carré, you’ll feel a quiet sense of scale. The dam stretches across a narrow alpine valley, holding back a crystal‑clear reservoir that mirrors the sky. From the crest you can see:
- Panoramic mountain ridges to the east, with peaks that still retain snow caps well into June.
- Lush alpine meadows dotted with edelweiss and gentian flowers during the summer months.
- A network of small streams that cascade down the slopes, feeding the dam’s intake.
The walk is flat and safe, suitable for all ages. Signage explains basic hydrological functions in French and English, making it an informal educational stop for curious travelers.
Because the dam is not heavily commercialized, you’ll encounter few other visitors, especially on weekdays. Bring a water bottle, sunscreen, and a light jacket—the altitude can cause rapid temperature shifts.
Nearby Attractions
While the dam itself is the star, the surrounding area boasts several natural spring sites that add variety to your day trip. All are within a short drive or hike from the dam:
-
Spring of Mont‑Léger – 1.5 km away. A bubbling alpine spring that feeds a small brook. Ideal for a quick photo stop.
- Visit Spring of Mont‑Léger -
Spring of La Source Bleue – 1.5 km away. Known for its turquoise water, this spring is a favorite among local hikers.
- Visit Spring of La Source Bleue -
Spring of Les Hautes‑Rivières – 2.3 km away. A gentle cascade that creates a natural pool—perfect for a brief rest.
- Visit Spring of Les Hautes‑Rivières -
Spring of Le Petit Lac – 2.4 km away. A secluded spring that forms a tiny lake surrounded by pine trees.
- Visit Spring of Le Petit Lac -
Spring of Val‑Clair – 2.7 km away. Offers a scenic viewpoint over the valley and a chance to spot alpine wildlife.
- Visit Spring of Val‑Clair
These springs are free to access and provide excellent opportunities for picnicking, wildlife spotting, and short nature walks.
Travel Tips
| Tip | Details |
|---|---|
| Dress in layers | Altitude means cooler temperatures even in summer; a fleece or windbreaker is essential. |
| Footwear | Sturdy hiking shoes with good grip are recommended for the dam’s concrete surface and the surrounding rocky paths. |
| Timing | Arrive early (before 10 am) to enjoy the soft morning light on the water and avoid the occasional midday crowd. |
| Parking | The lot near the trailhead fills up quickly in peak season; consider taking the bus or a bike if you’re staying in Allevard. |
| Safety | Stay behind any safety railings, especially after heavy rain when the water level can rise quickly. |
| Leave No Trace | Pack out all litter, especially near the springs, to preserve the pristine alpine environment. |
| Photography | A wide‑angle lens captures the dam’s expanse; a polarizing filter helps reduce glare on the water surface. |
| Local food | Stop in Allevard for a savoyard tartiflette or a warm raclette—perfect after a hike. |
| Language | French signage dominates; a few basic phrases (“Bonjour”, “Merci”, “Où est le barrage ?”) go a long way. |
| Connectivity | Mobile signal can be spotty at 1 600 m; download offline maps (e.g., Maps.me or Komoot) beforehand. |
Final Thought
The Barrage de Plan Carré may not have the fame of the Eiffel Tower or the glamour of the French Riviera, but it offers something far more intimate: a quiet, high‑altitude encounter with France’s engineered harmony between water and stone. Whether you’re a seasoned trekker, a photography enthusiast, or simply a traveler seeking an off‑the‑radar spot, this dam in Rhône‑Alpes delivers a memorable slice of alpine serenity.
Pack your boots, charge your camera, and head north to Allevard—Plan Carré is waiting.
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