Le Grand Manti, the Trèfle tunnel and Alpettaz via Pas de la Mort

Hike to discover the sources of the Guiers Vif and the Crêtes du Grand Manti, among waterfalls, caves, cliffs and mountain pastures.
Please note that this hike is vertiginous in some areas (Pas de la Mort) and is not recommended for people who are prone to vertigo or in wet weather.

Details

1518024
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  • Walking
    Activity: Walking
  • ↔
    Distance: 9.68 km
  • ◔
    Average duration: 6h 05 
  • ▲
    Difficulty: Difficult

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 1,175 m
  • ↘
    Descent: - 1,177 m

  • ▲
    Highest point: 1,814 m
  • ▼
    Lowest point: 850 m

Photos

Description of the walk

Park in the Cirque de Saint-Même car park.

(S/E) Follow the road leading to the cirque. Take the first footbridge on the right and cross the Guiers. Follow the yellow-marked path towards the Grande Cascade. Ignore the path on the left and the two paths on the right.

(1) Grande Cascade waterfall in the Cirque de Saint-Même: cross the footbridge and follow the yellow-marked path that climbs up after the waterfall.
After about 100 metres, leave the yellow-marked path and take a path on the right that climbs up the hillside. Follow this path, which is marked by cairns.

(2) At the fifth bend, leave the path that climbs and take the path opposite to the source of the Guiers Vif.

(3) At this point, you can visit the cave upstream (remember to take a torch). You can also descend slightly between two cliff faces to the top of a waterfall (the path is equipped with cables to help you navigate this challenging terrain). To return, take the same path in the opposite direction.

(2) Continue along the winding path upstream. Follow this path, which quickly becomes exposed, to the Pas de la Mort. The path is equipped with cables and ladders, but there is a constant view of the drop below! This passage is not suitable for people who are prone to vertigo, or in wet weather.

(4) Be careful here: take the Pas de la Mort via the passage equipped with cables and ladders to reach the top of the cliff. Follow the path uphill, marked by cairns, until you reach the bottom of the Alpettaz mountain pasture. On the path, you will find several old boundary stones that marked the border between the Kingdom of France and Savoy in 1822.

(5) In the meadow, the paths are not very well marked. Climb straight up the slope to a well-marked path marked in red and white (GR®), and continue on the left until you reach the Alpettaz habert.

(6) From the habert, climb to the right towards the Grand Manti cliffs, following the mountain pasture along the ridge (follow the Kingdom of France - Savoy boundary markers that mark the landscape to the summit). You will arrive at the Grand Manti ridge.

(7) Follow a faint path on the right. About 600m further on, the cliff on the left narrows to a point where the ledge below the cliff joins the ridges. From there, you can descend onto the ledge and, after walking back about 30 metres along the ledge, reach the Trèfle tunnel. (The Trèfle tunnel is not visible when walking forward, but can be seen when walking back).

(8) At the Trèfle tunnel, return by the same route to the Alpettaz habert.

(6) Follow the red and white marked path (GR®) to the right until you reach the signposts for Alpette de la Dame.

(9) Turn left onto the yellow and red marked path (GR® Tour de Chartreuse). Follow this path towards Les Varvat. Pass the Rigne Bâton fountain (reservoir on the right of the path).

(10) Take the second path on the left (be careful, this path is not very well marked and descends straight down the slope: to find it more easily, look for the forest path where it crosses a small valley; the path is supported at this point by a concrete beam, and a small round red mark on the ground (to the left of the path) indicates the location of a "staircase" of three log steps leading down to a winding path with few cairns).

Follow this steep path until you reach the Cirque de Saint-Même car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 852 m - Cirque de Saint-Même car park
  2. 1 : km 1.37 - alt. 1,015 m - Large Waterfall
  3. 2 : km 1.79 - alt. 1,148 m - Guiers Vif springs trail - Pas du Ruat
  4. 3 : km 1.89 - alt. 1,107 m - Source of the - Guiers Vif (rivière)
  5. 4 : km 2.58 - alt. 1,248 m - Pas de la Mort (1340m)
  6. 5 : km 3.08 - alt. 1,472 m - Alpettaz mountain pasture
  7. 6 : km 3.75 - alt. 1,556 m - Habert de l'Alpettaz - L'Alpette des Dames
  8. 7 : km 4.56 - alt. 1,800 m - Crêtes du Grand Manti - L'Alpette des Dames
  9. 8 : km 5.27 - alt. 1,794 m - Tunnel du Trèfle
  10. 9 : km 6.85 - alt. 1,538 m - L'Alpette des Dames
  11. 10 : km 8.75 - alt. 1,111 m - Path on the left
  12. S/E : km 9.68 - alt. 852 m - Cirque de Saint-Même car park

Notes

This is a vertiginous hike, not recommended for those prone to vertigo.
However, the tricky sections are equipped with cables and ladders to help you navigate the ledge and the Pas de la Mort.
Sturdy footwear is essential, and you must be sure-footed.
Do not attempt this route in wet weather (rain or snow).

Please note: in summer, there is a charge for parking at the Cirque de Saint Même (€3.50 per car) according to the following schedule: https://saintpierredentremont.org/savoie...

Variations:

(10): instead of taking the steep path on the left, you can continue straight ahead and turn left at the next intersection towards the hamlet of Saint Même d'en Haut, then follow the road back to the car park. This route is easier to walk but takes longer.

(3): A path climbs up to Pas Ruat from the foot of the large Guiers Vif waterfall: it climbs to the left of the waterfall above the grassy strips. Once you reach the resurgence basin just above the waterfall, turn left to enter a circular tunnel that curves upwards to the right and joins the top of Pas Ruat. ( variant suggested by bouvierjr )

This route passes through a protected area, which may be subject to special regulations:

Worth a visit

There are many points of interest along the route:

(1) Large waterfall in the Cirque de Saint-Même
(4) Cave and waterfall at the source of the Guiers Vif (cave can be visited in dry weather)
(5) Pas de la Mort: a vertiginous ledge equipped with ladders and cables
(7) Habert de l'Alpettaz: shepherd's hut not open to the public
(9) Tunnel du Trèfle: natural arch in the Grand Manti cliff

(Between S/E and 1) a path on the left leads to the Petite Cascade waterfall in the Cirque de Saint Même.

Always be cautious and plan ahead when you're outdoors. Visorando and the author of this route cannot be held responsible for any accidents occurring on this route.

The GR® and PR® markings are the intellectual property of the Fédération Française de Randonnée Pédestre.

Reviews and comments

4.4 / 5
Based on 19 reviews

Reliability of the description
4.3 / 5
Ease of following the route
4.1 / 5
Route interest
4.8 / 5
bouvierjr
bouvierjr ★

Is there a GPX track for this route, ideally with a marker showing the location that caused the problem? I do this hike at least once a year, the last time being last winter, and I didn't notice any rockfalls.

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Dijame
Dijame

Overall rating : 3.7 / 5

Date of your route : Nov 04, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★☆☆☆ Disappointing
Route interest : ★★★★★ Very good
Very busy route : No

The path was not well defined. We climbed up to look for the way, without success. But we couldn't go back because it was too steep and the ground was crumbly: it was impossible to turn back. We had to go through an even steeper section, holding on to trees and then clinging to tufts of grass.
The slope was about 75 degrees, extremely dangerous. We managed to get through thanks to our climbing skills.
—> If you turn right, you'll end up at the bottom of the death step. I don't recommend venturing there, even if you're climbing, as it's impossible to find the path. Perhaps a landslide has wiped it out

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François Rabou
François Rabou
• Edited:

Overall rating : 4.7 / 5

Date of your route : Oct 02, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Following a landslide, it is no longer possible to access the footbridge leading to the Guiers springs cave.
There is a sign with a prefectural decree at the fork in the road leading to the footbridge.
The aerial walkway at Pas de la Mort is well secured, but caution is still advised.
At Alpettaz, the path is very poorly marked and we had to search a little to find it.
The view from the ridges is magnificent, especially in good weather.
We had to search a little to find the tunnels and arches as they are below Grésivaudan.
The final descent is very steep, and it is easier to take the longer route back to the car park.

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granmejanlou
granmejanlou

Overall rating : 4.3 / 5

Date of your route : Oct 02, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

The small turn-off to find the Tunnel is not signposted (500 m, 5 mins to the right from . We have placed cairns, but we assume that given the "Private Property" signs, these have been removed....
The fork to find the last path in the steep woods is actually on the concrete footbridge and is very difficult to see. On 28 September, we really had to climb over the cable and a fallen tree.
I think I read that the path to the cave is closed because a rock damaged the footbridge. I didn't go to check

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Charlie 38
Charlie 38

Overall rating : 4 / 5

Date of your route : Oct 09, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : No

A pleasant hike that can be done without any particular difficulty.

The start is really nice with the waterfall in the cirque and the climb to the sources of the Guiers.

The death pass is quite tricky to cross, so take care...

Once you reach the mountain pastures, the climb to Le Grand Manti is quite long.

There is a beautiful view of Belledonne right in front of you.

The tunnel is a bit tricky to find; we searched for a while as it's really low down.

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muse_88_
muse_88_

Overall rating : 3.3 / 5

Date of your route : May 21, 2022
Reliability of the description : ★★★☆☆ Average
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Very busy route : Yes

Hello,
A hike with a variety of activities during the interesting climb. The cave is really nice, with water flowing down to form a well. The passages with handrails are not as steep as indicated.
However, the view at the top is not one of the most beautiful in Chartreuse. A little disappointing.
The return journey through the forest is endless. The final descent is very steep and slippery, which is exhausting. You always have to be on your guard. In terms of time, it took us more like 6 hours and 15 minutes with the various visits.

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ClémentT
ClémentT
• Edited:

Overall rating : 4.3 / 5

Date of your route : Nov 24, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

An interesting but accessible route, which can be completed without difficulty even at the end of November. There is no snow except for a few light patches at the very top of the Grand Manti ridges. It is best to do this route in dry/sunny weather, and outside of peak times (June/July/August, Saturday/Sunday afternoons, etc.), as you can better enjoy the scenery and wildlife, particularly the chamois on the western slope of the Grand Manti. The Pas de la Mort is relatively easy, provided you watch your step, as you can better enjoy the scenery and wildlife, particularly the chamois on the western slope of the Grand Manti. The Pas de la Mort is relatively easy, provided you watch your step, as you can better enjoy the scenery and wildlife, particularly the chamois on the westernetc.) as you can better enjoy the scenery and wildlife, particularly the chamois on the western slope of Grand Manti. The Pas de la Mort is relatively easy as long as you watch your step, have good footwear and avoid wet days. However, the descent from the mountain pastures, particularly the last section (from point 10), is steep, slippery and difficult to see. Only a few cairns (sometimes far apart) help you to stay on track, so please maintain them and feel free to add your own.

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satou
satou

Overall rating : 4.3 / 5

Date of your route : Sep 13, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A superb hike in a unique setting. The cirque is magical, the spring and its cave are impressive, and the Pas de la Mort is generally safe if we are careful and the ground is dry.
It is impressive, but very well equipped, and not really dangerous.
When we climb back up to the mountain pasture, the path is a little difficult to find, but we quickly find our way to the Grand Manti ridge and its superb view.
On the descent, the last path leading to the car park is extremely steep and very slippery in the trees.
Despite my equipment, my walking sticks, and my good physical condition, I fell twice in an uncontrolled manner.
It might be wise to extend the route and avoid this very steep and treacherous section.

Overall: a superb hike, to be done in dry weather with good footwear and people who are not prone to vertigo.

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yves truchet
yves truchet
• Edited:

Overall rating : 4.3 / 5

Date of your route : Jul 02, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Great hike, not very busy.
Waterfalls, a cave, a tunnel, ridges... in short, lots of interesting things to see!
Very well equipped
Sometimes we hesitated a little in finding the right route, but we quickly found our way back on track (coming out of the woods before the Alpettaz meadow)
A magnificent view of the ridge, we found the clover tunnel very easily, a nice place to stop for photos.
The last descent back to the car park is very steep. My son and I found it great fun, but it must be really difficult in wet weather!

I highly recommend it, but avoid it if you are prone to vertigo.

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taad
taad

Overall rating : 4.3 / 5

Date of your route : Jun 12, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

I just did this hike today, but I couldn't find the path that goes up to Grand Manti from Habert de l'Alpettaz. Could someone help me?

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Mbar2
Mbar2

Overall rating : 4.3 / 5

Date of your route : Jun 01, 2021
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Hike completed on 01/06/2021
Lots of people down to the bottom of the big waterfall (even on a weekday!), but then no one else

Please note:
1/ It was not possible for us to reach the top of Pas Ruat via the circular tunnel (see § Variants) because there was a 1 m deep pool of water blocking access from the very first few metres.
2/ The death pass is very well equipped. However, do not attempt it with people who are prone to vertigo, poorly shod or... not focused.

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emmszc
emmszc

Overall rating : 4.7 / 5

Date of your route : Aug 15, 2020
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Arrival at 9:30 a.m., bring cash to pay for parking (the toll booth is parish specific to Brittany before the car park) – it costs €3.50 and they don't take cards!

A magnificent, challenging hike! It was a bit crowded at the start after 10 a.m., but at 9:30 a.m. it was fairly quiet.
The first part near the waterfalls is family-friendly and very quick; you reach the top of the last one in less than an hour and a half. Then we didn't see anyone between the last waterfall and the end of the Pas de la Mort (equipped with cables and bars). The landscape and undergrowth are breathtaking.

The hike is fairly easy to follow up to the ridges (with a magnificent view of the Dent de Crolles), but then it gets complicated to find the Tunnel du Trèfle. After 15-30 minutes, we finally found it a little below the cliff. It's pretty, but it's not the most beautiful spot on the hike.

The descent was uneventful except for the end towards Saint-Même-d'En-Haut, where the path is very steep and very slippery for a few hundred metres, which is hard on the knees.

All in all, a sublime, athletic and varied hike that I highly recommend!

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vandelan
vandelan

Overall rating : 5 / 5

Date of your route : May 28, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful and very varied hike. First, you climb up to the large waterfall, then you leave most of the other hikers behind and head towards the source of the waterfall. Here, we chose the route through the cave, which was really nice but involved quite a bit of climbing: a little physically demanding but doable without climbing equipment. Then there is a steep climb up to the Pas de la Mort, which is dizzying but not dangerous as long as you take it slowly and know your limits. The small cairns in the forest just after the Pas de la Mort are very useful for finding the path. There are no difficulties after that, and the view is magnificent from the top of the Grand Manti cliffs: on one side over the Chartreuse and on the other over Belledonne and the Isère valley. We didn't go as far as the tunnel (8). The descent is pleasant, but the very end is very steep.

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Mimizen38
Mimizen38
• Edited:

thank you for the recommendations.
Also, for your information, it is possible to retrieve the .gpx track and then edit it using the application offered by Visorando so that you can post the alternative route: it might be useful to do so

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bouvierjr
bouvierjr ★

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