The Roman bridge of Assentiz originally had two arches, but after a major flood in the 18th century, one of the sides gave way, leaving the bridge with only one arch. Analysing the way the stones in the arch area are placed, it is possible to conclude that this bridge is not in fact Roman, especially since it is now known that the Roman road did not pass through here.
The bridge was part of the royal road built by order of Queen Maria I at the beginning of the 18th century, which followed the route of the old Roman road for most of its route. This royal road facilitated access to the region, allowing the flow of its products and also the passage of the mail carrier (transport of mail and people) that had a change point in Alto da Serra.
The bridge is in urgent need of refurbishment and consolidation works.
There is currently a bridge adjacent to it to connect Assentiz and Arrouquelas.