Top 4 Lakes around Pantano de Valmayor

On November 26, 2025, the water covered many areas that are normally passable. You had to "climb" several rocks to get around the reservoir. This section was especially tricky when descending, and even more so if you were alone.

Paths and cattle trails very suitable for bike rides.

Valmayor Reservoir overflowing due to recent rains in April 2025

With all this water I didn't know if I would get through.

Today, February 9, after the rains, the reservoir is higher, although you can still cross without climbing the rock, with a little care you won't get wet.

As of January 1, 2025, the water will no longer cover the path that runs under the granite stone and it can be passed through without any complications.

The passage through the Arroyos dam is closed, we will have to go all the way around the tail of the reservoir to another small dam in ruins.

This reservoir is the second one that stores the most water in the entire Community of Madrid. Although it belongs to the Guadarrama basin, it is built on the Aulencia River (which is the main tributary of the Guadarrama). It was decided to build in the mid-sixties due to Madrid's water needs following its demographic growth. Although at first it seemed more logical to build it on the Guadarrama River, it was finally decided to do it on the Aulencia, for several reasons, among which the practical absence of population centers in the area and the granite (and impermeable) bottom where it was located stood out. .