South of Pamplona, a line of stone arches marches across the valley toward the town of Noáin, and almost everyone who sees it for the first time assumes the same thing: this has to be Roman. It isn’t. The Acueducto de Noáin, also called the Acueducto de Subiza, was designed by the royal architect Ventura Rodríguez and built between 1783 and 1790, during the reign of Carlos III. It is an 18th century engineering project, not an ancient one. Completed in June 1790, it is, technically, younger than the United States.
The confusion isn’t a minor footnote. It has been persistent enough, for long enough, that Navarra’s own regional press has had to keep correcting it. A 2020 feature in Noticias de Navarra ran under the headline “230 años del Acueducto de Noáin, no dos mil o más”: 230 years old, not two thousand or more. Getting this wrong matters because it erases the real story: a single design and construction team building two of Pamplona’s most recognizable neoclassical landmarks at almost the same time, and a monument that has physically lost pieces of itself to a 19th century railway and a 20th century highway, a far more interesting history than “ancient ruin” gives it credit for.
This account draws on Spain’s national tourism board listing for the site, the Universidad Pública de Navarra’s own archival photo collection, the Universidad de Navarra’s Cátedra de Patrimonio y Arte Navarro (which documents the parallel Cathedral facade project), Navarra regional press coverage, and Spanish Wikipedia’s citation trail back to Spain’s Ministerio de Cultura heritage registry, cross-checked against each other for every figure below.
Ventura Rodríguez Built It, and He Wasn’t Working Alone in Pamplona That Decade
The aqueduct’s design is credited to Ventura Rodríguez, one of the leading Spanish architects of the 18th century. The commission had originally gone to a French engineer, Francisco Geni, but the finished project was Rodríguez’s. He spent 40 days in Pamplona in 1780 studying the terrain and water quality before drafting anything. By August 1782 he had delivered a full study, a written report, and twelve plans. Construction ran from 1783 to 1790, under the technical direction of Santos Ángel de Ochandátegui, with Francisco Alejo Aranguren collaborating in the earlier phase. Water reached Pamplona’s public fountains, designed by Luis Paret, on June 29, 1790. The total cost came to 300,000 pesos.
What most coverage of the aqueduct leaves out entirely is that Ventura Rodríguez was doing something else in Pamplona at almost the exact same time: designing the neoclassical facade of Pamplona Cathedral. The cathedral design was ready on February 5, 1783, just months after the aqueduct plans, and construction on the facade ran from 1783 to 1800, overlapping the aqueduct’s build almost year for year. The same executing architect, Santos Ángel de Ochandátegui, carried out both projects. Two of the city’s defining 18th century landmarks, the water supply that kept Pamplona running and the face the cathedral shows the world today, came from the same two men working in the same decade. That is the real story behind the arches, and it has nothing to do with Rome.
A Route of Nearly 16 Kilometers, and an Arcade You Can Actually See
The aqueduct’s full water route ran roughly 15.5 to 16.5 kilometers, carrying water from a spring at Subiza, on the north slope of the Sierra del Perdón, through the villages of Subiza, Beriáin, Potasas, Imárcoain, Tajonar, Zolina, Mendillorri, and Badostáin before reaching Pamplona. Most of that route is invisible today, buried underground exactly as it was designed to be.
The section everyone photographs is different: the visible arcade behind the town of Noáin, where the aqueduct had to cross a depression in the land rather than tunnel through it. That stretch originally ran 1,245 meters on 97 stone and brick arches, each spanning roughly 8.35 to 8.5 meters, reaching a maximum height of 18 meters at the tallest point. It is the largest visible structure of its kind in the area, which is precisely why it reads as ancient to anyone driving past.
There is also a second, smaller visible section most visitors never hear about. Between Noáin and Tajonar, the aqueduct runs underground for about a kilometer through the Sierra de Tajonar, ventilated by eight vertical shafts, the deepest reaching 68 meters down. Where that tunnel surfaces again near the village, a separate 580 meter stretch, only about 5 meters high and carried on 12 stone arches, is a completely different scale from the famous 18 meter arcade a short distance away. In 1992, the aqueduct was declared a Bien de Interés Cultural, Spain’s Cultural Heritage Site designation, in the category of Monumento. It supplied Pamplona with drinking water until 1895, more than a century of continuous service before the city moved on to newer infrastructure.
Why the Aqueduct Is Missing 3 of Its Original 97 Arches
Of the original 97 arches, 94 still stand. The three that are gone did not fall from age or neglect; they were deliberately removed for infrastructure that Navarra needed more than it needed a complete 18th century water arcade.
The first loss came in 1859, when construction of the Pamplona-Castejón railway line required cutting through the aqueduct’s path. A pillar was sacrificed to let the tracks pass, and a train still runs beneath the aqueduct toward Madrid every day. The second and third losses came more than a century later, in 1971, when construction of the Autopista de Navarra removed two complete arches from the final stretch of the arcade to make way for the highway.
Between them, one arch lost to a 19th century railway and two lost to a 20th century highway account for exactly the difference between 97 and 94. It is a specific, documented, two-part story, not a vague “some arches are missing” footnote, and it says something honest about how Spain has treated its own infrastructure heritage: useful enough to protect in 1992, but not so sacred that it stopped a railway in 1859 or a highway in 1971.
The Roman Myth, and Why It Sticks
The Roman confusion is not baseless. Navarra genuinely does have Roman-era remains, and some of the most significant are inside Pamplona itself: the Roman baths and mosaics of ancient Pompaelo, excavated beneath what is now Plaza del Castillo. A visitor who already knows Navarra has real Roman ruins, and then drives past a kilometer of towering stone arches, has every reason to assume the two are connected. They are not. Pompaelo dates to the first century BC. The Acueducto de Noáin was built roughly 1,800 years later.
Nineteenth century travelers reportedly made the same mistake, mistaking the neoclassical arcade for genuine Roman engineering, which is part of why the confusion has had such a long life. It was persistent enough that Navarra’s own regional press was still actively correcting it in 2020, nearly 230 years after the aqueduct’s completion and almost three decades after its 1992 heritage listing. The scale and repetition of an arcade will do that to a monument: the eye reads “ancient” long before the mind checks the date.
Visiting the Acueducto de Noáin Today
The aqueduct is free to visit, with no admission and no set hours, since it is an open-air structure rather than an enclosed monument. It sits just south of the city, in the municipality of Valle de Elorz, a short drive from central Pamplona rather than a landmark inside the city itself.
The site also sits directly on the Camino de Santiago as the pilgrim route crosses the Cuenca de Pamplona, in the shadow of the Sierra del Perdón, the same ridge crowned by the well-known silhouette sculpture of pilgrims that most Camino walkers photograph on their way through. Anyone walking that stretch, having already crossed the Pyrenees at Roncesvalles days earlier, passes beneath or alongside the arches without needing to plan a separate trip. It joins a short list of Pamplona-area monuments the Camino runs directly past, alongside the Puente de la Magdalena inside the city itself, another crossing that looks far older than its documented restoration history actually allows. For visitors relying on a car, the most complete view of the arcade comes from the roads and tracks approaching Noáin from the south.
The aqueduct’s position on the Camino also gives it a heritage status beyond its own 1992 Bien de Interés Cultural listing. Spain’s UNESCO inscription for the Caminos de Santiago de Compostela includes a retrospective inventory of associated component elements along the route, hundreds of them in Navarra alone, and Wikimedia Commons’ own structured heritage data records the Acueducto de Noáin as one of these associated components tied to the French Way. It is not a standalone World Heritage Site, but it is formally counted as part of the wider heritage landscape the Camino protects.
Frequently Asked Questions
Is the Acueducto de Noáin Roman?
No. It is an 18th century neoclassical aqueduct, designed by Ventura Rodríguez and built between 1783 and 1790 during the reign of Carlos III. It is sometimes mistaken for a Roman ruin because Navarra does have genuine Roman-era remains elsewhere, including under Pamplona’s own Plaza del Castillo, but the aqueduct itself postdates Rome’s presence in the region by roughly 1,800 years.
How old is the Acueducto de Noáin?
Construction ran from 1783 to 1790, with water reaching Pamplona’s public fountains on June 29, 1790. That makes the aqueduct just over 230 years old as of the early 2020s, not ancient by any measure, though it looks the part.
How many arches does the Acueducto de Noáin have today?
94 of the original 97 arches survive. One pillar was sacrificed in 1859 for the Pamplona-Castejón railway, and two complete arches were removed in 1971 during construction of the Autopista de Navarra.
Can you visit the Acueducto de Noáin from Pamplona?
Yes. It sits just south of the city in the Valle de Elorz municipality, a short drive from central Pamplona, and is free to visit year round with no set hours. It also lies directly on the Camino de Santiago as the route crosses the Cuenca de Pamplona beneath the Sierra del Perdón.
Every article on the Encierro blog is authored or reviewed by active bull runners with direct experience in Pamplona.