Puente Romano de Merida

Pons Emeritensis

BridgeLusitania · Merida, SpainBuilt 25 BCE

About

Built alongside the founding of Emerita Augusta in 25 BCE as the colony's crossing of the Guadiana, this granite bridge is one of the longest surviving bridges from antiquity — sources give figures around 755-792 meters and roughly 60 arched spans, partly owing to a period causeway over floodplain reaches. Repaired and partly rebuilt many times over two millennia, including major 17th-century flood repairs, but its Augustan-era piers and much of its original alignment survive; it remained the city's principal river crossing into the modern era.

What happened here

Piers are set on cofferdams — a ring of driven piles, pumped dry, filled with concrete that sets under water. They are built with a cutwater pointing upstream to split the current and the ice. The span above may be stone arches or timber on stone, and timber is not a poor relation: it is cheaper, faster, and replaceable. Roads approach on an embankment so the crossing stays level. Tolls are common, shrines at either end are usual, and the inscription names whoever paid. Floods are the enemy; a bridge is inspected after every big one, and the scour around the piers is packed with rubble. A bridge fixes a town's position for a thousand years, which is why so many are still standing.