Parc naturel régional Gruyère Pays-d'Enhaut - This dam, located along the Jogne river, is responsible for Montsalvens lake. Built between 1918 and 1921 by engineer Heinrich Eduard Gruner, it was the first arch dam in Europe with both horizontal et vertical curves. 52m high and 110m long, its construction required 26’000 m3 of concrete.
The trials leads to Châtel-sur-Montsalvens in a superb course that is listed in the inventory of historical traffic routes in Switzerland. Afterwards the trail descends to the Broc chocolate factory and to Gruyère.
From the middle of the village the trail descends to the Lac de Montsalvens, then along the lake to the dam of Châtel-sur-Montsalvens - the first arch dam in Europe. The trail then leads to the little town of Gruyère.