It is formed by a 128 meters high Gravity dam and it is located at the confluence of the municipalities of Pesoz, Grandas de Salime and Allande.

The idea of building a power station in the zone started in 1940 in the location where Narciso Hernández Vaquero planned originally.

[1] Immediately after the World War II, the project, made by the architect Joaquin Vaquero Palacios, and the construction started.

For paying the works, the companies Hidroeléctrica del Cantábrico and Electra de Viesgo created the company Saltos del Navia en Comunidad, endorsed by Banco Urquijo, whose office prepared the technical reports.

Spain was plunged into misery and suffering the embargo of the victorious powers in World War II.