A beautiful hike to discover the waterfalls of the Alloix stream: the Gouille Michel Waterfall and the Grande Cascade. The trail is dotted with waterfalls and “cascatelles” (small waterfalls), as well as pools (“gouilles” in local dialect). Hence the name “Gouille Michel Waterfall.” The route I suggest here leads to beneath the Grande Cascade with a return either on the same path or via a loop. While not as frequented as the waterfalls of the Cirque de Saint-Même, the Alloix waterfalls are nonetheless impressive, especially during the snowmelt when their flow is at its peak.
I have explored the hike several times and here I provide all the necessary information for your visit.
Why Visit the Alloix Waterfalls?
The Alloix waterfalls are more than just a hike; they are an immersion into the natural beauty of the Chartreuse Massif. This hike is perfect for nature lovers, families, and adventurers alike. And if you’re lucky, you might even spot some local wildlife.
How to start your hike to the Alloix Waterfalls
1. Cross the campsite and follow Rue de la Croix Blanche, which runs parallel to the main road.
2. Keep an eye out for the roof of Château du Montalieu in the distance.
3. At the first crossroads, take the left-hand path marked for the Alloix waterfalls.
4. At the next junction, follow the right-hand trail labeled “les chemins d’autrefois”, which closely follows the stream.
5. If you see a wooden bridge ahead, congratulations—you’re on the right track!


The Alloix Waterfalls Hike: What to Expect
The hike is mostly shaded, making it an ideal summer activity. The path crosses the stream several times via small wooden bridges, some of which were rebuilt after flooding in 2018. Along the way, you’ll encounter remnants of a 1931 hydroelectric dam project, with rusty pipes scattered in the stream. I wonder why they haven’t removed them yet.



We reach the first small waterfall. Its turquoise waters give us a preview of what’s to come.


The photos above (mid-May and mid-June) show how three weeks of good weather can affect the waterfalls. Keep this in mind if you plan to visit the Alloix Waterfalls in summer.
Gouille Michel Waterfall (475 m)
The Gouille Michel Waterfall is a picturesque tufa waterfall with emerald-green pools that invite swimmers (if you’re brave enough to handle the cold!). On one of my visits, I spotted a salamander, a delightful reminder of the area’s rich biodiversity. The limestone formations and cool mist make this spot a perfect place to pause and recharge.


After this refreshing break, we continue the Alloix Waterfalls hike to reach the Grande Cascade. The trail becomes narrower and, above all, steeper! But the view is worth it.

Another small waterfall can be seen in the distance. Depending on the flow, it’s possible to get closer. Its pool is perfect for a swim.

The Middle Waterfall of the Alloix Stream
Next, we encounter another waterfall, which has no name. Therefore, I have named it the Middle Waterfall of the Alloix Stream. To get closer, be cautious on the descent; I saw a hiker, with a cooler in hand, take a tumble… fortunately, nothing was broken

The Grande Cascade (600 m)
I can already see the Grande Cascade from the trail. From a distance, it’s impressive!

To reach it, the trail becomes more precarious. When it’s wet, it can be quite dangerous. Therefore, cables have been installed. During one of my visits, it had rained heavily, and the trail was so muddy that I had to hold onto anything I could find along the way. I even encountered a hiker walking barefoot, as he told me that in sneakers it was far too slippery…

The Grande Cascade is the highlight of the Alloix Waterfalls hike. Standing 43 meters high, it is impressive! The last time I visited (mid-June), it was already dry… so it was not the same spectacle.


We don’t stop there and continue to the left (where the via ferrata is indicated). Here, the trail goes beneath the waterfall. The path is also muddy, so be careful of slipping.


The trail then leads to the start of the via ferrata.
Saint-Vincent Via Ferrata
It is currently closed until further notice. This via ferrata passes close to waterfalls. It is not particularly difficult and is set in a beautiful environment. At the end of the route, there is a very nice viewpoint over the valley and the Belledonne massif. As a via ferrata enthusiast, I went alone and didn’t take many photos as a result. It’s worth doing again once it reopens. Be careful not to attempt it without the essential equipment.


Return
You can continue on the trail and complete a loop to reach Montalieu and the via ferrata parking area. The descent is via the old Roman road and is a fairly easy path. However, I recommend retracing your steps and enjoying the waterfalls once again in a different light.
Tips for a Safe and Enjoyable Hike
Best time to visit
The best time for this hike is in May or after heavy rains. Indeed, it is the snow melting in spring that feeds the waterfalls. From mid-June (or earlier, if it’s dry), the waterfalls are almost dry. The last time I visited, the Grande Cascade had disappeared. My first visit wasn’t very enjoyable. It was a very hot weekend at the end of May, and there were so many people that it was difficult to progress at your own pace. So I decided to return this year during the week. It was a very good decision!

Swimming in the Alloix Waterfalls
Swimming is allowed in the Alloix Waterfalls. If you’re not deterred by cold water, you can even enjoy the emerald pools of the waterfalls. I’m too sensitive to the cold, so dipping my toes was enough for me…
Trail Conditions
The trail is rated Easy+ but can be challenging in wet conditions. Hikers prone to vertigo may find the section leading to the Grande Cascade tricky.
Dogs
Dogs are allowed, but exercise caution on steep or slippery sections.
Practical Information for the Alloix Waterfalls Hike
Parking: Via ferrata St Vincent-de-Mercuze
Starting Altitude: 353 m
Length: 3.6 km
Arrival Altitude: 630 m
Elevation Gain: 270 m
Duration: 3 hours round trip
Type of Route: Out-and-back