Towards Lac d'Oô

de fr

A lovely walk gradually ascending towards the artificial Lac d'Oô and the large waterfalls that feed it.

Details

n°156366
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  • Walking
    Activity: Walking
  • ↔
    Distance: 4.50 mi
  • ◔
    Average duration: 3h 20 
  • ▲
    Difficulty: Moderate
  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 1,470 ft
  • ↘
    Descent: - 1,457 ft
  • ▲
    Highest point: 5,003 ft
  • ▼
    Lowest point: 3,714 ft
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Photos

the lake from the waterfall
Lake and waterfall at Lac d'Oo
A view of the valley and the car park below
Lake Oô still frozen

Description of the walk

Access: From Oô, follow the D76 and park in the Granges d'Astau car park.

(S/E) Head towards the end of the road, leaving Les Granges on your left, to pick up the path.

(1) The path climbs fairly gently for 1.5km, then twists and turns appear. Stay on the main path and leave the lane leading to the buildings on your right.

(2) Continue uphill until you reach a slightly downhill section. Continue for 100m.

(3) There is a small path on your right that leads to one of the exits from the dam.

(4) Turn around and return to the narrow path.

(3) Take the main path to the right as far as a bridge.

(5) Continue straight on towards the dam, skirting its bank for a short distance.

(6) Turn around and return to the bridge.

(5) Cross it and head towards the section overlooking the Auberge Refuge du lac d'Oô.

(7) Return the same way you came (S/E).

Waypoints

  1. S/E : mi 0 - alt. 3,717 ft - Car park - Les Granges d’Astau
  2. 1 : mi 0.13 - alt. 3,773 ft - Start of the trail
  3. 2 : mi 1.5 - alt. 4,774 ft - Path to buildings
  4. 3 : mi 1.8 - alt. 4,915 ft - Small path on the right
  5. 4 : mi 1.85 - alt. 4,806 ft - Dam outlet
  6. 5 : mi 2.05 - alt. 4,885 ft - Bridge - Neste d'Oô (rivière) - Affluent de l'One
  7. 6 : mi 2.19 - alt. 4,974 ft - Right bank - Lac d'Oo
  8. 7 : mi 2.48 - alt. 5,003 ft - Point dominating the > - Refuge du Lac d'Oô
  9. S/E : mi 4.5 - alt. 3,714 ft - Parking des Granges d'Astau. Close to the - Neste d'Oô (rivière) - Affluent de l'One

Notes

Take all the essentials you need for a mountain hike:
- food and drink
- protection from the weather (sun, rain, wind, cold, etc.),
- lighting (torch) in case the hike finishes late.

Worth a visit

During this walk, I saw many hikers in bivouac mode continuing beyond the point (6).
I refer you to the "Lac d'Espingo" hike
https://www.visorando.com/randonnee-lac-...
There were tents pitched near the hostel.

At the starting point at the Granges d'Astau, it is possible to get something to eat (certainly in summer).

Reviews and comments

4.7 / 5
Based on 104 reviews
Reliability of the description
4.8 / 5
Ease of following the route
4.9 / 5
Route interest
4.4 / 5
mamatitou
mamatitou

A lovely walk, very green at the end of June, and relatively easy.....

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User 24897617

Overall rating : 5 / 5

Date of your route : Jul 30, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A lovely, easy walk. Perfectly shaded on hot, sunny days.
Outside school holiday periods, it’s certainly less crowded.

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Parkside
Parkside

Overall rating : 5 / 5

Date of your route : Jul 27, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

This is an ideal route for very hot weather, as much of it takes place in the forest.

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mamatitou
mamatitou

Overall rating : 4.7 / 5

Date of your route : Jun 23, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

A lovely walk, very green at the end of June, and relatively easy.....

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Viso37
Viso37

Overall rating : 5 / 5

Date of your route : Jul 14, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A trail that is largely shaded. A very pretty lake.

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User 16344593
• Edited:

Overall rating : 5 / 5

Date of your route : Jun 30, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Hello, I am a Master’s student in Tourism and Development and, as part of my dissertation, I am researching hikers, their knowledge of the environment, their hiking practices and the impacts on the mountain environment. Lake Oô is one of the areas I am studying. Every response is very useful to me as part of my research, so I am providing a link to my survey here.
https://enquetes.univ-tlse2.fr/index.php...
Otherwise, the route is very well signposted and the lake is magnificent

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User 529180

Overall rating : 5 / 5

Date of your route : Apr 09, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

We went for a walk in glorious weather. There were signs of avalanches along the path, and we even saw a small one as we stood by the lake.
There were already quite a few hikers on this route, including some with dogs!

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User 28782695

Overall rating : 5 / 5

Date of your route : Apr 13, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

An easy, very scenic walk with stunning views and the option to continue further up...

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User 27040457

Overall rating : 5 / 5

Date of your route : Sep 06, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Hike well described in the app.

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User 4035572

Overall rating : 5 / 5

Date of your route : Sep 08, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

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User 10007746

Overall rating : 4.7 / 5

Date of your route : Sep 02, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A beautiful, fairly easy hike. The path is wide and the climb is easy.
The lake is magnificent. Well worth discovering.

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User 7610973
• Edited:

Overall rating : 5 / 5

Date of your route : Sep 01, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Very beautiful lake but too crowded

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User 3372869

Overall rating : 5 / 5

Date of your route : Aug 29, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Perfect Visorando tour, thank you

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User 25592606

Error: "lac" should be "anglas"

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Laplante cedric
Laplante cedric

Overall rating : 4.7 / 5

Date of your route : Aug 18, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

The lake is truly beautiful
The route is unremarkable
Lots of people, more than I've ever seen before

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