10 15 Great Cycling Climbs to Alpine Dams/Lakes

Views from Col du Pré

Views from Col du Pré

What is more beautiful than cycling in the high Alps? Cycling in the Alps up to an alpine lake!

Most of the largest high altitude lakes are created by man-made dams – usually built to supply hydro-electric power. Many of the highest dams in the world are situated here.

From a cyclist’s point of view, there are three great thing about Alpine dams:

  1. Dams are often very high, accumulating water from Glacier melt
  2. Dams need quality access roads for the service personnel
  3. These roads are often “dead-ends” and thus have virtually no traffic

Here are 10 15 great cycling climbs up to alpine dams / lakes (map at bottom).

#1. Lac d’Emosson
 Lac d'Emosson View of Lac d'Emosson

Steep climbing to a stunning location. The first dam at Emosson was built in the 1920′s to supply electricity to the Swiss National Railway.

Note, the 3rd photo above: there is a slightly insane road that is ride-able above the dam up to a smaller dam / lake above. Details here.

#2. Lac de Roselend
Barrage de Roselend Barrage de Roselend

Above Beaufort, the route over Cormet de Roselend appears frequently in the Tour de France.

While there is a direct way up via Col du Meraillet, the better route is via the super steep Col du Pré. This allows superb views from above the Lake – as well as letting you ride over the dam itself on the way to Roselend. Remember the lake is several kilometres below the summit.

Details here. Note, the route in this link also includes a detour to another beautiful Alpine Lake/Dam: Lac de Saint Guérin.

#3. La Grande Dixence
La Grand Dixence La Grande Dixence Barrage - La Grande Dixence

The biggest of the many alpine dams in the Valais region of Switzerland.

This gigantic dam collects water from 35 glaciers. At 285 metres it is currently the 3rd highest dam in the world – a third higher than the Hoover Dam. It weighs more than the great Pyramid of Cheops. Details here.

#4. Lac de Sanetsch
Barrage du Sannetsch Barrage du Sanetsch

The huge climb over Col du Sanetsch to the lake was one of the most pleasant surprises last year. A beautiful, quiet road.

There is only a road on the south side. But at the dam is a little cable car that will take bikes up/down the north side from near Gsteig. Eric once carried his bike up the trails here. Only recommended for the slightly crazy. Details here.

#5. Grimselsee
Grimsel Pass - below the dam Grimsel Pass

There are several dams near the top of Grimsel Pass. From the north, this climb is huge. From the south, the hairpins are unbelievable. Details here.

#6. Lac de Mauvoisin

Another steep, beautiful, deserted road up to the 13th highest dam in the world. The start point is the same start point for Verbier and near the start for Col du Grand St. Bernard.

See the video in the link: It’s necessary to brave a little tunnel to get up on top of the dam. Details here.

#7. Lac de Saint Guérin
Barrage de St-Guérin Lac de Saint-Guérin

With the same start point as Roselend, this great route leads to a smaller, but very pretty dam / lake.

Stop for a drink to enjoy the view, but don’t stop, as this lake is only part way up the fantastic climb to Cormet d’Arèches. Details here.

#8. Lac de Mont Cenis
Col du Mont-Cenise Cycling Lac du Mont Cenis Col du mont cenis

I’ve only cycled the French side, but the Italian side is apparently much more interesting.

The climb starts from the same spot as the magnificent south side of Col de l’Iseran.

Details here.

#9. Lac de Grand Maison
stage17 Lac de Grand Maison Col de la Croix de Fer

This large French lake is near the top of the legendary north side of Col de la Croix de Fer (and Glandon).

It’s at the point where the roads finally gets a little less steep – so while participating in La Marmotte you can enjoy the views. Details here.

#10 Oberalppass

Oberalppass is not the hardest climb in the cycling Mecca region around Andermatt, but it is still over 2,000 metres and is certainly idyllic.

It features in the June 2010 Tour de Suisse and even has a train station at the top for the famed Glacier Express. Details here.

Note: I am going to keep addind to this list as I find more great climbs. Here’s two that are as tough as any on this list:

#11 Mattmark See

The route starts in Visp in the main valley. The first nine kilometres is the same road that leads to Zermatt and the Matterhorn, so there is some traffic. But once the route turns towards Saas Fee things get quieter.

It’s not the hardest climb but 1580 metres of ascent is, for example, much bigger more than any climb in this year’s Tour. More details here.

#12 Lac de Moiry

The ascent to Lac de Moiry has to be one of the hardest of these alpine lake climbs. 2100 metres (7000 feet), hard work.

I took the harder but quieter route via Vercorin – it adds 300 metres of climbing but has far less traffic. See the map for the easier route, which I used for the descent. More details here.

#13 Lac de l’Hongrin

Beautiful vineyards, a challenging climb, a long tunnel, military checkpoints, an alpine dam/lake, and a beautiful castle – this loop has it all.

And most of it is virtually deserted! Details here.

#14 Route des Lacs

This is my favourite route in the Pyrenées. This lessor know route in fact passes 5 Alpine lakes including the fabulous climb to Lac de Cap de Long. Truly amazing.

Details here.

#15 Lac des Gloriettes
Lac des Gloriettes Lac des Gloriettes Lac des Gloriettes

High in the Pyrenées above Gavarnie is a fabulous, deserted ride to Cirque de Troumouse. On the way down I made a small detour up to the dam at Lac des Gloriettes. Details here.


This list is by no means even remotely comprehensive. Feel free to suggest your favourite alpine lake /dam.

View Cycling Climbs to Alpine Lake / Dams in a larger map


About Author

Happiest while cycling uphill. More enthusiastic than talented, my 2014 Challenge is to cycle 50 great rides, slowly.


  1. Et pense à ceux qui prennent 1 semaine de vacance exprès pour faire des cols et qui se retrouvent avec ce temps de chien … :lol:
    Beau classement !

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  3. philippandsons on

    Will, have you ever been to Lac Champex? It’s a nice ascent via Martigny and a fast decent to Oursieres, from where you can either return to Martigny or proceed to Col de Grand St Bernard.

    I visited the Lac d´Emosson twice this summer with the bike, which is absolutely stunning!
    FYI: They closed the dam and particularly the other road up to the Vieux Lac d´Emosson.

  4. Sami Toutounji on

    Will, as a fellow English speaking, uphill cycling expat in France, I’ve enjoyed your site for years and was delighted to see from your lake pictures that we ride the same model / color Madone.

    Not as grand as your top 12, but the Lac du Chambon on the way down the Lautaret is noteworthy, as is the Lac de Serre Poncon, although the latter admittedly isn’t a quiet high mountain lake like the others.


  5. Mary Westmacott on

    What beautiful scenery, god i wish i could get out and cycle around some places like that! You’ve given me some great holiday ideas for this year, thanks for posting x

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  10. Cycling up in the Alps with the amazing scenery and unique terrain I can only imagine is a surreal experience. I’m a huge fan of cycling especially around the tuscany region – some fabulous cycle routes there, but the Alps is a different beast. Great photo’s

  11. Hi Will,

    I’m a great fan of your blog as it’s my main source of inspiration for the discoveries of alpine climbs. I live in Pays de Gex (Ornex) and cycle preferably in the Jura but also love to cycle in the Valais or the french alps. Last Monday I climbed Lac de Mauvoisin and even went through the tunnels on the west side of the lake to explore a bit the continuation of that road leading to Cabane de Chanrion, a project for next summer.
    While checking the Valais for other lake climbs, I noticed a smaller dam north of Sion, called “Lac de Tseuzier”.
    A nice description of the ascent is here: http://www.velcanto.ch/Velo/Parcours/ValaisCentral/ParcoursTzeuzier.pdf

    Have you ever been there ?
    cheers, Markus

  12. Hi Markus,

    Thanks for the note.

    I have never been to Tseuzier, It’s on my list, glad to see that it is in fact do-able by bike.

    Drop me a line if you ride there.



  13. Hi Will,

    I would very much like to cycle with you one day but am afraid that I won’t be fast enough to be able to follow you. You must be super fit with all the outings you do.
    I’m currently in Bavaria (back to France tomorrow), but without any bicycle and just wait for the next nice day with decent temperatures to explore that ascent. I would probably choose the touring bike.

    Where do you live exactly (I suppose Geneva)?

    I will definitely let you know before going there and would be very happy if we could climb it together.
    Please send me a short email so that I have your address.

    Thanks & best regards, Markus

  14. Hi Markus,

    I am currently struggling with a bad knee injury that just won’t heal.

    Drop me a line in 2014, hopefully I will be cycling again,


  15. Hi Will,

    too bad !
    I wish you a good recovery and hope you’ll be fit again next year.
    If you want we could meet for a beer in Geneva. I’m so curious to talk to you about your cycling challenges!

    cheers, Markus

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