Udondo Bridge

One of Bizkaia’s greatest industrial heritage gems – Udondo Bridge – stands very close to the Leioa Metro underground stop, where the Udondo and Gobela rivers flow into the Nervión-Ibaizabal river estuary. It is longest surviving bridge of the many that Bilbao had; it was the first iron bridge built in Spain and also the oldest of the ones to be found today; it is also one of the few cast-iron bridges still existing outside the British Isles.

Built in 1846-47, it was dismantled from its original location in Bilbao and relocated in Leioa in 1876 to place the stone bridge that stood there until it was blown up by Carlist troops.