Around the Altenweiher

From the Col de la Schlucht, take the ridge road towards Markstein and park in the Maison de la Nature car park by the roadside. This short hike will take you up the steep slopes of Kastelberg and Rainkopf to discover the Altenweiher dam lake before climbing back up to the top of Rainkopf. You can walk around the lake, which takes about 20 minutes extra.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 9.51 km
  • ◔
    Average duration: 4h 20 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 553 m
  • ↘
    Descent: - 553 m

  • ▲
    Highest point: 1,304 m
  • ▼
    Lowest point: 922 m

Photos

Description of the walk

Rothenbach car park on the Route des Crêtes

(D:A) Opposite the car park, take the path eastwards over the stubble to reach the Rothenbach pass.

(1) Follow theGR®5variant towards La Schlucht (red and white rectangle markings) passing the chicane to cross the pasture. Along the way, enjoy the view of Lac de Blanchemer on your left.

(2) Once you reach the small pass of Rainkopf, continue north on theGR®5, passing in front of the old Vosgien Club refuge in Mulhouse and near the Firstmiss farmhouse inn (you will pass the end of the car park) until you reach the junction with the path on the right.

(4) At the crossroads, turn right ontothe GR®531marked with a blue rectangle towards the Kastelberg farmhouse inn. Follow the path into the forest.

(5) At the edge of the forest, not far from the access road to the inn, follow the yellow cross markings on the right to descend towards the lake.

(6) When you reach the dam, you can walk around the lake. Alternatively, cross the dyke to join the path towards Les Chaumes.

(7) Follow the yellow horse signposts towards Firstmiss, passing through the Pferrey glacial valley. You will notice orchids growing here.

(2) At the Rainkopf small pass, head south and follow thefirst path on the left marked with a blue rectangle, which will take you to the top of Rainkopf. Along the way, admire the Altenweiher Lake and the Alsatian valleys.

(8) At the summit, altitude 1,305 m, view of the Rothenbachkopf. Follow the blue rectangle markings for a few metres.

(9) Leave the trail on your right and descend to the left (marked with a red and white rectangle) towards the Col du Rothenbach.

(1) At the intersection you passed at the start of the hike, turn right towards the Rothenbach car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 1,195 m - Rothenbach car park on the Route des Crêtes
  2. 1 : km 0.1 - alt. 1,203 m - Rothenbach Pass
  3. 2 : km 1.66 - alt. 1,192 m - Rainkopf
  4. 3 : km 1.84 - alt. 1,204 m - Refuge Louis Hergès
  5. 4 : km 2.17 - alt. 1,244 m - Crossroads towards the Kastelberg inn
  6. 5 : km 3.18 - alt. 1,228 m - At the edge of the forest
  7. 6 : km 5.56 - alt. 925 m - Dam - Altenweiher
  8. 7 : km 5.67 - alt. 938 m - End of the dam
  9. 8 : km 8.81 - alt. 1,304 m - Rainkopf altitude 1305 m - Rainkopf
  10. 9 : km 8.93 - alt. 1,298 m - Crossroads
  11. S/E : km 9.51 - alt. 1,195 m - Rothenbach car park

Notes

Several sections cross scree, so sturdy footwear is recommended.

Please note:
The maps available to us are from 2009, and some changes to the markings have been made in this area since then.
The IGN map on the app and the IGN paper map currently on sale are not up to date.

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

4.9 / 5
Based on 13 reviews

Reliability of the description
4.9 / 5
Ease of following the route
4.9 / 5
Route interest
4.9 / 5
Magali_J88
Magali_J88

Overall rating : 5 / 5

Date of your route : Aug 09, 2025
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A magnificent hike.
A long descent and a long climb, but the slopes are gentle and the forest provides welcome shade in hot weather.
Hiking boots are essential as there are lots of stones in places and it can be slippery.

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Dadou88
Dadou88

Overall rating : 5 / 5

Date of your route : May 12, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

I recommend a superb hike

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Inaya
Inaya

Overall rating : 4.7 / 5

Date of your route : Aug 29, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A lovely descent towards the dam. I recommend going around the lake, it's very beautiful and there are lots of places to stop for lunch in the shade. Then begins a lovely, long climb. Lots of shady spots.

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thib2
thib2

Overall rating : 4.7 / 5

Date of your route : Aug 05, 2024
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

a very pleasant hike, three-quarters of which is in the shade, which is welcome in hot weather.
The first part to the lake is easily accessible, but the second part to the summit is more challenging. You need to be well equipped as there are lots of scree, rocks and trees across the path.
We walked more than 12 km, not 9.5 km as advertised!

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KAUFFMANN Pierre
KAUFFMANN Pierre

Overall rating : 4.7 / 5

Date of your route : Nov 27, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

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Danyp
Danyp

Hello
Thank you for sharing this hike. We really enjoyed it.
During this hike, we found a mobile phone on the shore of Lake Altenweiher on Saturday, 9 September 2023, at around 2.20 p.m. We realise this is off topic, but we wanted to report that we found this phone because we can imagine how the person who lost it must feel. The phone is in airplane mode and locked, so we don't think we'll be able to find the owner. We saw on the screen that the phone was using Visorando, which is why we're sending this message today.
We wish everyone wonderful hikes. Best regards.

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Rose de Vernon
Rose de Vernon

Overall rating : 5 / 5

Date of your route : Aug 20, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

I absolutely loved this hike.

It was a bit tricky at first, as we ended up in the middle of a trail, but everything went well! You really need good hiking boots because there are lots of scree slopes, and it's slippery. Ideal in hot weather, as much of it is in a lovely, magical forest, all green (despite the heatwave) with little cool streams running through it. We had a picnic with our feet in the water and were almost alone by the lake. We passed through the beautiful village of Pferrey, with its adorable little calves.

Before returning to the car, we climbed up to Rotenbachkopf and we didn't regret it! What a view! Beware of vertigo!

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Jonathan67
Jonathan67

Overall rating : 5 / 5

Date of your route : Aug 07, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Superb route, varied landscapes.

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RafRuns
RafRuns

Overall rating : 4.7 / 5

Date of your route : Oct 17, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

From start to finish, this hike is a feast for the eyes.
In mid-October, the colours of the forest oscillate between green and red under a cloudless sky as blue as the air we breathe up there.
The start is relatively simple, but not easy either due to the scree, rocks and roots on the path. Most of the elevation gain is on the climb from the lake, a beautiful, steep ascent through the forest before arriving at the inn.
Thanks to the author, we had a wonderful time.

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roro68
roro68

Overall rating : 5 / 5

Date of your route : Mar 13, 2017
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful hike with my 9- and 11-year-old children.
We set off from the Auberge de la Chaume du Forstmiss and that was enough for us.
The climb was tough, but the magical memory of the lake left us with very fond memories.
The mysterious saxophonist was there that day...

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katiorek
katiorek
• Edited:

Overall rating : 4.7 / 5

Date of your route : Jul 30, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Great hike!
This route is ideal for hot weather as it is shaded three-quarters of the way.
The signposting is perfect, impossible to get lost. The trail sometimes deviates slightly from the original, but this isn't a problem.
two hours for the first part to the lake, a quick picnic by the lake (you absolutely must walk around it!) and two hours to climb back up.
The climb back up is not as steep as expected. You can stop for a drink at the Firstmiss farmhouse inn on the way back.
I recommend this hike

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boldeagle67
boldeagle67
• Edited:

Overall rating : 5 / 5

Date of your route : May 29, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A route that requires good physical condition, superb views with the option of extending the route slightly with the climb up to the Rottenbachkopf pass

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lgn68
lgn68
• Edited:

Overall rating : 5 / 5

Date of your route : May 21, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A pleasant route, in accessible areas shared with other routes. It was busy, but still acceptable.
The route is shaded, so it's refreshing, and you can enjoy a pleasant picnic by the lake. At times, the GPS route is slightly off the path, but it's fairly easy to find your way.

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behappy57
behappy57
• Edited:

Overall rating : 5 / 5

Date of your route : Jan 13, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good

A very beautiful parish-specific to Brittany hike with magnificent scenery. Although it was foggy, so visibility was poor, with the snow and the sun shining through, it was absolutely beautiful! I highly recommend it.

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