Embalse de El Vellón, embalse en el río Guadalix
The Embalse de El Vellón, also called Pedrezuela, is a large water reservoir in northern Madrid built across the Guadalix River. The surrounding landscape features mixed terrain with rocky banks, open water, and vegetation that changes throughout the year.
The dam was completed in 1967 and was one of the first of its kind to use a double-curvature arch design by Canal de Isabel II. A small hydroelectric plant was later added to generate electricity from the flowing water.
The reservoir is used by local fishermen and people seeking outdoor relaxation along its shores. The area reflects a culture of patience and respect for nature, where visitors follow clear guidelines to protect the water and fish populations.
Fishing requires a permit available from local authorities or nearby shops, and anglers are limited to two rods per person. Access is easy from Madrid via the N-I road, and visitors can walk along the shore Tuesday through Sunday, though fishing is not allowed on Mondays.
The reservoir's name comes from an old mill that once stood in the area, locally known as Molino del Vellón. Though named after this mill, most of the surrounding lands and water basin actually belong to the nearby town of Pedrezuela.
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