Hérisson waterfall and Bonlieu lake

This magnificent hike will take you along the Cascades du Hérisson waterfalls and around Lac de Bonlieu.
Don't forget your camera, as there are some magnificent views.
Please note that from the point (4), the trail is temporarily closed due to a landslide.

Technical sheet

243131
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  • Walking
    Activity: Walking
  • ↔
    Distance: 15.53 km
  • ◔
    Average duration: 5h 20 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Vertical gain: + 321 m
  • ↘
    Vertical drop: - 321 m

  • ▲
    Highest point: 809 m
  • ▼
    Lowest point: 597 m

Photos

Description of the walk

This hike starts from the car park near Lac d'Ilay.

(S) Opposite the house, cross the D75 and continue straight ahead to La Fromagerie. At the houses, turn left onto theGR®559Atrail.

(1) Cross the D39 and follow the path down to the Cascades du Hérisson. When you reach the first waterfall, the Saut Girard, cross the Hérisson.

(2) Turn right and follow the Hérisson along the left bank.

(3) until you reach the Sarrazine footbridge. This path is very pleasant and well maintained, although a little steep in places.

(4) When you reach the Sarrazine footbridge, turn left towards Bonlieu (yellow signposts). The path that climbs up is quite narrow with a steep drop on your right, so be careful. Leave the path on your right that leads to the Dame Blanche viewpoint and head straight towards Bonlieu.

(5) When you reach Bonlieu, cross the D678 to join a road opposite the church that descends next to the fountain. Turn left at the fork and cross the bridge over the stream.

(6) Turn left onto Rue de la Sirène towards the abbey. Turn right at the first fork, then left at the next one and continue to Route du Lac (elevation 807).

(7) Then turn right towards the campsite and follow the D75E1 (route du Lac).

(8) Cross the Hérisson bridge and continue straight ahead to the abbey and the oratory a little further on.

(9) When you reach the oratory, turn right onto the path that runs alongside the lake until you reach a crossroads of white paths.

(10) Turn right to return towards the bridge over the Hérisson that you crossed earlier.

(8) Continue straight ahead towards the waterfalls. This forest path will take you to the D678.

(11) Follow the road for a few metres on your left, then turn right onto the D75 towards Ilay until you reach a car park on your left.

(12) Turn left onto a path that descends to Saut Girard.

(2) Turn right and return by the same route as on the way there towards the cheese dairy and then Lac d'Ilay (S/E).

Waypoints

  1. S/E : km 0 - alt. 776 m - Parking - Lac de la Motte ou d'Ilay
  2. 1 : km 0.65 - alt. 772 m - The cheese dairy
  3. 2 : km 1.42 - alt. 731 m - Saut Girard
  4. 3 : km 2.73 - alt. 710 m - Near the Saut de la Forge - Hérisson (rivière) - Affluent de l'Ain
  5. 4 : km 3.78 - alt. 597 m - Sarrazine footbridge - Cascade de l'Éventail
  6. 5 : km 6.18 - alt. 780 m - D678
  7. 6 : km 6.62 - alt. 768 m - Rue de la Sirène
  8. 7 : km 7.94 - alt. 807 m - At elevation 807, on Route du Lac, turn right
  9. 8 : km 8.37 - alt. 794 m - Bridge over the Hérisson
  10. 9 : km 8.98 - alt. 798 m - Oratory
  11. 10 : km 10.36 - alt. 809 m - Crossroads
  12. 11 : km 13.31 - alt. 776 m - Intersection of the D678 and D75
  13. 12 : km 13.82 - alt. 766 m - Parking, take the path on the left
  14. S/E : km 15.53 - alt. 776 m - Lac d'Ilay car park

Practical information

Wear good walking shoes and bring walking sticks, which are very useful for the climbs. Bring drinks and energy food.

(4) Once you reach the Sarrazine footbridge, you can make a return trip to the right to the viewpoint of the Eventail waterfall (option not shown on the route map).

 Always stay careful and alert while following a route. Visorando and the author of this walk cannot be held responsible in the event of an accident during this route.

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

Reviews and comments

4.6 / 5
Based on 68 reviews

Reliability of the description
4.6 / 5
Clarity of route map
4.5 / 5
Route interest
4.6 / 5
User 15564531

Overall rating : 5 / 5

Date of walk : Oct 27, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

A very beautiful hike.
Lake Bonlieu is magnificent in autumn.
We did the walk in reverse order so that we could walk up the waterfalls: more interesting for the view. But this meant that the start of the descent to the Éventail waterfall after several days of rain and on ground covered with dead leaves was tricky (very narrow and slippery): we descended it with caution.
As advised by another hiker, we descended below the Fan Waterfall: it was well worth it.

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christine21000
christine21000

Overall rating : 4.7 / 5

Date of walk : Sep 17, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : No

I had a wonderful time: the waterfalls and the lake are magnificent. Not many people during the week. The path along the waterfalls is quite slippery. Clear explanations and signposting.
Worth doing again...

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User 25416593

Overall rating : 4.3 / 5

Date of walk : Aug 31, 2025
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : No

Magnificent waterfalls. Beautiful route.

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User 3357964

Overall rating : 4.7 / 5

Date of walk : Jul 27, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★☆ Good
Busy trail : Yes

A beautiful hike to do early in the day to avoid the crowds in the first part
Don't hesitate to make a return trip to see the last waterfall before starting the climb through the forest
No difficulty

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guyu671
guyu671

Overall rating : 4.7 / 5

Date of walk : May 29, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : Yes

too many people at the weekend

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Doremi 13
Doremi 13

Overall rating : 4.3 / 5

Date of walk : Jun 12, 2025
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : Yes

Magnificent waterfalls (we were lucky enough to go hiking after heavy rain) contrasting with a peaceful lake. Contrary to what is stated in the introduction to the comments, there is no longer a dam after level 4, so we were able to complete the entire route. However, avoid weekends and school holidays as much as possible to avoid the crowds.

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Gigi 25
Gigi 25

Overall rating : 4.7 / 5

Date of walk : Dec 01, 2024
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

Very beautiful hike. I recommend it. Varied and beautiful landscapes.

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bisontin
bisontin

Overall rating : 4.7 / 5

Date of walk : May 31, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★☆ Good
Busy trail : Yes

Very beautiful hike

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Damien76
Damien76

Overall rating : 5 / 5

Date of walk : May 26, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes

A beautiful hike that is a must after rain or even in bad weather. Magnificent surroundings!

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Anne Jo
Anne Jo

Overall rating : 5 / 5

Date of walk : May 19, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes

Beautiful hike.
Part 1: waterfalls: beautiful scenery. The waterfalls were full as it had rained in recent weeks. Be careful if it rains as it is slippery.
Part 2: continuation of a pleasant, shaded hike.

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renard25
renard25

Overall rating : 3.7 / 5

Date of walk : May 13, 2024
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★☆☆ Average
Busy trail : Yes

Overcrowded! Avoid at weekends and on public holidays, unless you're a politician and enjoy crowds.

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virgule
virgule
• Last modified:

Approximately one hour of cumulative waiting time during the climb (many people unfamiliar with hiking, young children, slippery trainers, etc.)

https://actu.fr/societe/jura-le-site-des...

Hello,

Thanks for letting us know.

Where's the fun in hiking? Or is it not hiking, but a tourist trail?

It's a vicious circle: the more people there are, the more people will think that if there are so many people, it's because it's a must-see. But the number of visitors to a place depends on many other factors. Social media currently has a big responsibility. And hiking websites, of course. Until the day when there are really too many people, which leads to an outright ban.

I'm still waiting for a thread on the dangers of mass hiking.

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Laurent rando
Laurent rando

Overall rating : 5 / 5

Date of walk : May 08, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes

Hike to do.
However, be careful when choosing the day and the time you plan to climb the waterfalls.
We did it on a public holiday in the afternoon, and it was like the Champs-Élysées.
There was about an hour's wait in total on the way up (lots of people who weren't used to hiking, young children, slippery trainers, etc.).

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Philippe pinto
Philippe pinto

Overall rating : 4.3 / 5

Date of walk : Apr 26, 2024
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : Yes

Up to kilometre 5, there are lots of people along the waterfalls, then the paths are almost deserted (a real treat). A very pleasant route.

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GTemplar
GTemplar

Overall rating : 5 / 5

Date of walk : Sep 19, 2023
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes

A very beautiful walk! The waterfalls are superb. There are far fewer people on the second part of the circuit. Definitely worth doing.

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