From Lac du Ronzey to Crêt du Py Froid, via the Garon Dam

Starting from the pleasant shores of Lac de Ronzey, this hike takes you to its highest point, Crêt du Py Froid, passing by a dolmen and the Châteauvieux chapel. Finally, your steps will lead you to the dam on the Garon. Magnificent panoramic views of the Mont du Lyonnais and the city of Lyon will accompany you throughout your journey.

Technical sheet

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  • Walking
    Activity: Walking
  • ↔
    Distance: 16.15 km
  • ◔
    Average duration: 6h 10 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Vertical gain: + 530 m
  • ↘
    Vertical drop: - 533 m

  • ▲
    Highest point: 784 m
  • ▼
    Lowest point: 509 m

Photos

Description of the walk

The walk starts in Yzeron, in the car park next to Lac de Ronzey.

The hike follows short hiking trails marked in yellow. Signposts at major junctions should help you if you are unsure.

(S/E) Walk along the southern side of the lake. At the end of the lake, follow the path straight ahead up to the road. Follow it to the left and walk past the cemetery.

(1) At the end of the cemetery, turn right, then continue straight ahead at the crossroads and walk past the campsite. Follow the road to an intersection with a cross. Turn left to descend towards the village centre.

(2) Cross the D25 and take the small path that descends opposite towards the waterfall. Once on the road, turn right until the first intersection, then turn left and follow the road. When the road turns right, continue straight ahead on the road that leads to a house on the right, then turns into a path to reach the small waterfall.

(3) Follow the path and, at the fork shortly afterwards, continue to the right.

(4) At the crossroads, take the path downhill on the right. Cross the Yzeron and join a road. Follow it to the left.

(5) Turn onto the first road on the right to reach the hamlet of Le Giraud. Continue along the road, which curves to the right.

(6) Take the path on the left and follow the yellow signs towards the dolmen and Saint-Laurent-de-Vaux.

(7) At the intersection, turn right and follow the yellow signs to the dolmen.

(8) Continue along the yellow-marked trail to Châteauvieux. Continue along the small road to the chapel.

(9). Turn left, continue straight ahead at the crossroads, then leave the road that turns east and follow the path on the right. At the intersection, continue straight ahead, following the yellow signs to reach Crêt de Py Froid.

(10) Do not take the path that branches off to the right, but follow the path that runs along the ridge to a crossroads. Take the path on the left that winds down through the woods.

(11) The route temporarily leaves the yellow markings. Descend to the right towards the road and cross it to continue opposite on a tarmac road. At the fork, turn left and then immediately left again onto a path that winds downhill. A wooden sign indicates the direction of the dam.

(12) Once on the road, follow it to the left and rejoin the yellow markings. About 100 metres further on, take the path on the right which descends alongside the road you have just taken, then turns south. You will arrive at the lake.

(13) Go around the lake on the right, pass the dam, then turn right and continue to follow the yellow markings to reach a road.

(14) Follow the road to the right, then, at the bend, leave it and take a path on the left towards Biternay.

(15) In Biternay, cross the D628 and continue straight ahead, following the signs for Le Garon.

(16) When you reach the hamlet of Le Garon, take the road on the right until you reach a three-way junction. Continue on the left to return to the Yzeron cemetery.

(1) Turn left to return to Lac du Ronzey. This time, go around it on the left to return to the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 718 m - Lac de Ronzey - Yzeron (rivière)
  2. 1 : km 0.86 - alt. 720 m - On the right
  3. 2 : km 1.43 - alt. 710 m - Path opposite
  4. 3 : km 2.14 - alt. 610 m - Waterfall
  5. 4 : km 3.18 - alt. 554 m - Path on the right
  6. 5 : km 4.05 - alt. 515 m - Road on the right
  7. 6 : km 4.59 - alt. 527 m - Path on the left
  8. 7 : km 5.99 - alt. 526 m - On the right
  9. 8 : km 6.33 - alt. 580 m - Dolmen (Saint-Laurent-de-Vaux)
  10. 9 : km 7.32 - alt. 676 m - On the left - Chapelle Saint-Jean-Baptiste (Châteauvieux)
  11. 10 : km 8.39 - alt. 773 m - Straight ahead - Crêt du Py Froid (772m)
  12. 11 : km 9.69 - alt. 701 m - Leave the yellow markings on the right
  13. 12 : km 10.28 - alt. 642 m - Find the yellow markings on the left
  14. 13 : km 10.94 - alt. 518 m - Lake, on the right - Garon (rivère)
  15. 14 : km 11.85 - alt. 554 m - Road on the right
  16. 15 : km 12.96 - alt. 662 m - D628, opposite
  17. 16 : km 14.1 - alt. 644 m - Take the road on the right after crossing the - Garon (rivère)
  18. S/E : km 16.15 - alt. 718 m - Lac de Ronzey

Reviews and comments

4.4 / 5
Based on 22 reviews

Reliability of the description
4.3 / 5
Clarity of route map
4.3 / 5
Route interest
4.7 / 5
BarbaraLyon
BarbaraLyon

Overall rating : 4.7 / 5

Date of walk : Feb 25, 2025
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : No

A very beautiful hike, especially as the sun was shining! Varied paths and trails without any particular difficulties, alternating ascents and descents, interesting sights to see... (waterfall, dolmen, chapel, dam, panoramic views, etc.). Lunch at Crêt du Py Froid with a superb view of the mountains.
Points (11) and (12): we didn't identify "the path that winds downhill"! We only saw a slightly steep slope overgrown with brambles... so we continued on the path (which branches off to the left) and which leads to the lake (wet path, fallen tree but no difficulty in continuing)
Top 👍

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Sanpra
Sanpra

Overall rating : 4.7 / 5

Date of walk : Oct 20, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : No

A very pleasant hike alternating between woodland and more open areas.
A beautiful viewpoint and the opportunity to take a pleasant break in front of the stretch of water at the dam.

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ANNE2669
ANNE2669

Overall rating : 4.7 / 5

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

A varied hike that unfortunately ended in torrential rain.
During the descent to the Garon dam, the path was somewhat overgrown with tall nettles and other vegetation.
To be repeated in good weather.

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Chaden
Chaden

Overall rating : 5 / 5

Date of walk : Feb 23, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

Hike done on Saturday 24 February, so not many people around. On Sundays, there are lots of hikers and mountain bikers around Yzeron.
A pleasant hike in the woods with two lovely picnic spots: the Py Froid rocks and the Garon dam. The hike can be completed at a leisurely pace in 4½ hours without breaks.
Thanks to the author for this hike!

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Monsieur Chupon
Monsieur Chupon

Overall rating : 5 / 5

Date of walk : Feb 03, 2024
Reliability of the description : Not used / Not applicable
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

Hike completed today in the opposite direction. Very beautiful route offering varied views and environments. The lunch break at Py-Froid in the sunshine was extremely pleasant.
To be done again!

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jd693854
jd693854

Overall rating : 5 / 5

Date of walk : Nov 22, 2023
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

Hike completed under the November 2023 sun, during the week. It features two interesting picnic spots located at point 10 (climbing site) and point 13 (dam). We recommend choosing point 13, which is equipped with tables and benches so you can enjoy the location. To arrive there around 12:30 p.m., we left from the hikers' car park in Yzeron. Please note: in good weather, at weekends, the dam site can be very busy.
And there's nothing to stop you from taking a detour to Lake Ronzey on your way back from the hike to enjoy the scenery.
I highly recommend this hike.

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Selligus
Selligus

Overall rating : 4 / 5

Date of walk : Apr 19, 2023
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : No

Hello,

Very beautiful, varied paths, alternating descents and ascents. The overcast weather prevented us from fully enjoying the views.
I recommend stopping for a snack at the dam, where there are plenty of benches and tables. From this point, there is still a significant elevation gain to consider on the way back to the car park.

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zette
zette

Overall rating : 4.7 / 5

Date of walk : Mar 13, 2022
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No

Beautiful hike. Very pleasant route with beautiful views.
Very few people on the trail during the week.
Definitely worth doing again.

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Myl009 _66
Myl009 _66

Overall rating : 4.3 / 5

Date of walk : Feb 27, 2021
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : Yes

Great hike and the scenery is splendid.

It would be good to add options for the level of difficulty, as this hike, advertised as medium difficulty, was actually medium ++

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fmontagu
fmontagu

Overall rating : 4 / 5

Date of walk : Feb 21, 2021
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : Yes

The tree trunks that were reported in October 2020 still block the path for about twenty metres. It is possible to go around them or climb over them if you are reasonably flexible.
You need to pay attention at point 12 to find the path that leads down to the dam.
As for the tour of the dam, we must have been tired or not paying enough attention because we missed the path...
There were lots of people at the ridge and on the way back to Yzeron, but the rest of the route was fine

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gerardleo
gerardleo

Overall rating : 4.3 / 5

Date of walk : Oct 24, 2020
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : Yes

An interesting route alternating between descents and ascents, often under trees, with a passage under climbing rocks made tricky by uprooted trees. The downside is the number of people using the route, so avoid weekends and holidays if possible.

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Patlemarin
Patlemarin

Overall rating : 4.3 / 5

Date of walk : Oct 24, 2020
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★☆ Good
Busy trail : Yes

Very busy indeed, as is normal on Sundays!
Please note:
in the description, at point 10, "take the path on the left that descends..." : shortly after the first "hairpin bend" to the left on this path, foresters have left the tops of beech trees and other trees. The result: it's war! You have to go around them via a path above these branches (which are sometimes very large). Continue at the same altitude, roughly the same contour line, and you will eventually find the path and the yellow markings that lead to the dam.

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aquisbormonis
aquisbormonis

Overall rating : 4 / 5

Date of walk : May 29, 2020
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Busy trail : No

A very beautiful hike with lovely shaded sections. As already mentioned in some comments, you need to pay close attention to the route description... this meant we had to turn back a few times to find the right route...
Thank you for this wonderful discovery.
JC

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BERNARD GIROUD
BERNARD GIROUD

Overall rating : 4 / 5

Date of walk : May 05, 2019
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good

To be repeated in good weather, very pleasant route.
Be careful when leaving the yellow markings to reach the Garon dam.
Best regards

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chris770
chris770

Overall rating : 4 / 5

Date of walk : Apr 14, 2019
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good

A gentle hike with beautiful views.

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