Ponte Cardona

Deep in an oak wood south of Narni, a single Roman arch carries the last span of an ancient aqueduct across a dry ravine. Ponte Cardona pairs quiet engineering with an odd geographic honour: the wooded hillside here holds the calculated centre of peninsular Italy.

Why it matters

Ponte Cardona is the final and best-preserved of the four stone bridges that carried the Roman aqueduct of Formina from the springs of Sant'Urbano up to the hilltop city of Narni. The structure is small by the standards of imperial engineering — about nineteen metres long, with a single round arch — but it is remarkably intact: the original vault, the piers and part of the abutments still stand, and the water line they once supported kept Narni supplied into the early twentieth century. A point identified in 2006 by scholar Giuseppe Angeletti and the Istituto Geografico Militare as the geographic centre of peninsular Italy lies at Casa Erbabigia in the locality of Santa Lucia. The site combines Roman hydraulic engineering with this geographic marker.

What to notice

The arch is a true semicircular span of squared travertine, with light rusticated bossing on only some blocks and joints dressed with anathyrosis — a level of finish the municipal tourism portal reads as a matter of saving time rather than architectural display. The opening is modest, a couple of metres across, yet the whole structure stands nearly eight metres tall, which says something about how deeply the small stream once cut its ravine. The aqueduct channel has a consistent internal width and is punctuated by small openings and vertical maintenance shafts, features that supported its maintenance. The stream below runs dry for much of the year but can carry real water after sustained rain. The surrounding wood of oaks and holm oaks forms part of the protected Bosco di Ponte Cardona.

Context and history

Local historical research attributes the Formina aqueduct to the first half of the first century AD, and specifically to Marcus Cocceius Nerva, a member of the family that gave Narni its most famous son, the emperor Nerva. The line ran roughly thirteen kilometres from the springs below Sant'Urbano to the city, laid at a deliberately gentle gradient so the water would not gather speed and scour the internal masonry; galleries, bridges and shafts kept the fall constant. It served the city until the early decades of the twentieth century. Ponte Cardona carries the line across a wooded ravine in the Montagnone locality and, like its sister bridges, has been restored more than once over the centuries. Legend adds a final layer: a young man named Giovenale, kind to a begging friar from Sant'Urbano, was told in a dream of a treasure of silver coins of the emperor Nerva hidden beneath the bridge. Twice he dug; twice a violent storm broke over him. Many in Narni will tell you the treasure is still down there.