Acueducto de Los Arcos

The Acueducto de Los Arcos is a stone aqueduct standing about one kilometer southeast of the town of Calanda, in the province of Teruel, Aragón, Spain. It spans a section of the Guadalopillo river at a spot known as Los Arcos, the very name it borrows. Despite its bridge-like appearance, it was never built to carry people or goods — for centuries its sole job has been to carry irrigation water across a ravine.

What does the aqueduct look like?

The structure rests on three semicircular arches supported by solid stone pillars. Each pillar features tajamares — wedge-shaped cutwaters that face upstream, deflecting the current and any debris carried by the river so the supports stay intact over time. The whole aqueduct is built in dressed ashlar stone (sillar), a technique that explains why it has survived so many centuries largely intact. Running along the top is a water channel roughly 100 meters long and about 1 meter wide, which is where the actual irrigation flow travels.

Who built it, and when?

That question still divides historians. No definitive documentary evidence survives, so researchers have proposed either a Roman origin or, more commonly, an Arab-period (Al-Andalus) construction. What is certain is the earliest written reference: the Portuguese cartographer Juan Bautista Labaña described the aqueduct in his "Itinerario del Reyno de Aragón," compiled during his 1610–1611 survey of the Kingdom of Aragón commissioned by King Philip III. That account is the oldest confirmed proof of the structure's existence, even though the aqueduct itself is almost certainly much older than the document that first mentions it.

Is the aqueduct still in use?

Yes, and that is arguably its most remarkable feature. Centuries after it was built, the Acueducto de Los Arcos still performs its original job: carrying water from the local irrigation channel across the ravine without losing the gradient the fields need downstream. The aqueduct is directly tied to Calanda's irrigation network as it developed during the early modern period, making it an unusual case of working water infrastructure that never became a museum piece — it still serves the same farming community it was built for.

Why is it worth a visit?

The site combines landscape appeal with hands-on engineering history. The Guadalopillo valley around Los Arcos has kept its natural character, and the aqueduct itself, though modest in scale, impresses through the precision of its stonework and the logic behind how its builders solved the problem of moving water across uneven terrain. It makes for a quiet walk and good photography, especially for anyone interested in the history of the Bajo Aragón region.

Frequently asked questions

Where is the Acueducto de Los Arcos located? About 1 km southeast of Calanda, in the province of Teruel, spanning the Guadalopillo river at a spot known as Los Arcos.

How old is the aqueduct? Its exact construction date is unknown. Historians suggest either a Roman or an Arab origin, while the earliest written mention of the structure dates to 1610–1611.

Can you still see water flowing through the aqueduct today? Yes — the structure still carries irrigation water, so depending on the season and the local irrigation schedule, the channel can be seen in active use.

Is the aqueduct easy to reach for visitors? It sits close to town within the natural setting of the river valley, making it accessible on foot for anyone visiting Calanda.