Llauset dam is a high mountain reservoir located within the Natural Park of Posets-Maladeta, a Natural park located in northern Province of Huesca, Aragón, northeastern Spain, at an elevation of 2.250m (7,381ft) above the sea level. It's one of the highest roads of Spain.
Due to the altitude of the location, it is not accessible during winter. Avalanches and heavy snowfalls can sometimes block some sections of the road and can be extremely dangerous due to frequent patches of ice.
The road to reach the Llauset Dam starts asphalted. The landscape grows increasingly desolate and the the tarmac quality disappears through the floor. It is really worn, rough, and inconsistent. The last 1,5km to the lake, take place in a tunnel. This tunnel is well lit and more or less straight.
Starting from Bono, at 1,071 m above the sea level, the ascent is 17.4 km long. Over this distance, the elevation gain is 1179 heightmeters. The average percentage is 6.8 %.