Canal Bajo de Madrid

Canal Bajo de Madrid is a historic water supply canal in Madrid, one of the oldest surviving pieces of the infrastructure that first brought drinking water to the Spanish capital. Built in the mid-19th century, it remains part of the Canal de Isabel II water company's network and today doubles as a popular walking route on the city's northern edge.

What is the Canal Bajo?

The Canal Bajo was built as part of Madrid's first large-scale aqueduct system, bringing water from the Lozoya River into the city. Construction began in 1851 and finished in 1858, during the reign of Queen Isabel II, whose name was given to the whole water company, Canal de Isabel II. The project was directed by engineers Juan de Ribera and Juan Rafo. The canal runs for 58.1 km and originally carried up to 4 cubic meters of water per second, connecting the lower reservoir at the Torrelaguna facility with the Islas Filipinas reservoir — known as the Third Reservoir — inside Madrid.

The route covers only a modest change in elevation, dropping from 715.23 meters above sea level at its start to 690.82 meters at its end, a difference of roughly 24.5 meters across its entire length. Achieving that gentle gradient required serious engineering: the canal passes through 41 tunnels, crosses 27 aqueducts, and overcomes 4 ravines using metal siphons. For the mid-19th century, it counted among the most technically advanced hydraulic works built in Spain.

How do you get to the Canal Bajo?

The canal runs through the hills north of central Madrid, crossing the Viñuelas and Valdelatas areas before turning toward the Manzanares river valley. The easiest access points are around the Fuencarral-El Pardo district and the Valdelatas area, where marked paths follow the old channel. The section running through the Tetuán district is one of the better-preserved and most frequently documented stretches, tied closely to the historical growth of Madrid's northern neighborhoods.

What will you see along the way?

Walking along the canal, visitors can spot original stone and masonry elements from the 19th-century construction — sections of the old channel, tunnel remnants, and traces of the aqueducts that once carried water above ground. The Valdelatas stretch runs through green, wooded terrain, making it a favorite among hikers and runners looking for nature close to a major city. It is an unusual chance to see water infrastructure nearly two centuries old that still shapes the landscape of greater Madrid.

When should you visit?

Spring and autumn are the best seasons for walking the canal route, when Madrid's temperatures are milder and the surrounding vegetation looks its best. Summer heat in the region can be intense, so early morning is the better window for a visit at that time of year. The route is open year-round, though unpaved sections can turn muddy after heavy rain.

Frequently Asked Questions

What is the difference between Canal Bajo and Canal de Isabel II? Canal de Isabel II is the name of the water company and the entire supply network that has served Madrid since the 19th century. Canal Bajo is one specific canal within that system, responsible for carrying water from the Lozoya River to reservoirs in the city.

Is the canal still in use? The canal was built as active water infrastructure and served as a transport route for drinking water for decades. Today its course is best known as a walking trail, with surviving sections standing as a record of how Madrid's water supply developed.

How long does it take to walk the canal route? Given the full length of 58.1 km, most visitors choose a shorter section, such as the stretches near Valdelatas or Tetuán, which can be walked in anywhere from about an hour to a few hours depending on the segment chosen.

Is the route suitable for families with children? The sections near Valdelatas are largely flat with gentle terrain, making them a good choice for family walks and for visitors who prefer easier, low-difficulty trails.