Always check the weather before your trip!
* GPX tracks are taken on recreational level and they are not tested.
The track to Lake Nero (black Lake) starts from Riale plain, following the trail (or the dirt road) that climbs to Toggia alp. The path goes on until lake Kastel (or Castel), which was part of the hydroelectric plan that characterizes the Ossola mountains since the beginning of the last century.
The Kastel dam was built and completed in 1928, the walls are made of dry rocks and was 17 mt high. In 1955 the dam had a failure, following which some geological inspections were conducted. The reservoir was found to be karstic and extremely permeable, and so the project of an hydroelectric reservoir was abandoned. Today a single dam is no longer present, but two walls are left to channel the lake's water. But today the level of the water doesn't even touch the walls. The second pipe, which channeled the water to the Sottofrua station, it still visible today. Lake Nero's water was also channeled to the same station.
The climb to the lake crosses the Scelp creek, which, under certain circumstances, could be quite uneasy.
From the lake the Corno Talli can be seen, and the trail goes on until Basodino and Tamierhornm, the mountain that separates Val Formazza from Switzerland.