Summary: A challenging alpine walk from Lac Emosson to the Mont Buet peak (3,096m asl). The trail passes two high-altitude lakes and 250m year-old dinosaur footprints.

It feels like years since I’ve travelled overseas… actually, it has been years! This hike in Switzerland is from a few years ago, when pre-pandemic overseas work trips provided frequent opportunities to walk a bit further afield. This hike in the Swiss alps starts near Lac d’Émosson, at le barrage d’Emosson – Switzerland’s second largest dam. (The dam was build between 1969 and 1975 and is the second largest dam in Switzerland in terms of its capacity, and the third highest dam in the Valais canton.)

72380024 LR Climbing Mont Buet from Lac d'Émosson

The trail follows Lac d’Émosson, climbing to the Cabane du Vieux-Emosson above the lake before reaching the Lac du Vieux d’Émosson.

72380025 LR Climbing Mont Buet from Lac d'Émosson

Towards the end of the second and higher lake, the trail climbs up steeply towards the the Col de Terrase. HIgh above Lac du Vieux Emosson is a signposted fossil site.

Fossil footprints were discovered in 1976, and years later in 2008 Marco Avanzini (an Italian palaeontologist) identified the species that left the track.

72380028 LR2 Climbing Mont Buet from Lac d'Émosson

Dating back to 240 million years, the site predates the emergence of dinosaurs with the footprints left by primitive reptiles belonging to the Archosaurian groups (they include the ancestors of both dinosaurs and crocodiles). Resembling dinosaurs, these reptiles looked like short-muzzled crocodile, about 1.5 metres high when standing erect on their feet.

maxresdefault Climbing Mont Buet from Lac d'Émosson
Source: Sci-News.com

From the fossil site we climb steeply (again) up the Col du Vieux Emosson to just below Le Cheval Blanc (2,831m), where there is a great view over both lakes. (Being mid-September there’s no snow left at this elevation; the fossil site is generally free of snow from July.)

72380031 LR Climbing Mont Buet from Lac d'Émosson

The final ridge to Mont Buet from Pointe du Genévrier is steep and narrow, with a vertiginous drop on both sides – the “passage de la Chaïne”, which is the most difficult section of the walk. A chain provides safe passage and it’s not quite as dangerous as it looks… but you wouldn’t want to have a fear of heights! (In winter Mont Buet is used as a training climb for Mont Blanc, and ‘Mont Blanc Des Dames’ or Mont Blanc for the Ladies!)

72380035 LR Climbing Mont Buet from Lac d'Émosson

From the top of Buet at 3,096m above sea level, there’s a 360-degree panoramic view over the French alps including the Mont Blanc massive and Matterhorn.

View from Mont Buet

There’s still some snow on the peaks, and many snow-covered peaks and glaciers in the distance.

We return the same way; you can also ascend/descend Mont Buet from the south to form a longer

More information on Mont Buet and the Dinosaur Footprints

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