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Starting from Riale follow the San Giacomo Mountain pass built in the 20s to serve the workers building the Toggia and Castel dams, a true masterpiece, with reduce slope and perfectly aligned hairpin bends. Once the Toggia Dam has been reached we cross it and we stay along the lake for a brief stretch (be careful as the trail is very exposed and somewhat dangerous), so we take a track with modest slope until we retreat in direction of the Castel Lake. From the Castel Lake a new track put together by ENEL reaches the Ghighel Alp. From the guard house of the Castel Lake up to the Ghighel Alp a “flowered path” has been put together, a self-guided path with descriptive panels amidst these grassy lands of special naturalist and botanical interest. The relative multimedia content can be downloaded from our site

Along the path leading back to our starting point it is possible to take a shortcut: as soon as we get to the Castel Dam valley we can follow the road which goes down directly towards the crossroads from which Riale can be reached just a little bit below the Maria Luisa mountain hut.


Last update: 05/03/2018 ore 15:47:12

Itinerary informations

Starting Point

Riale (1731 m), parking lot in front of the Alts Dorf hotel


Riale – Rifugio Maria Luisa – Beginning of Toggia Lake Dam – End of Toggia Lake Dam – Castel Alpe Ghighel Lake Dam

Altitude Difference Going Up

520 m

Altitude Difference Going Down

110 m

Maximum altitude reached

2248 m above mean sea level (to the bottom of the Castel Lake)

Track Length

11.5 km (one-way)

Difficulty Level

EE (difficult)




Valle Formazza

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