The Roman bridge of Concordia was built in the second half of the I century B.C., right after the establishment of the Roman colony, between 42 and 40 B.C. The bridge was located by the entrance in town of the consular road “via Annia” and crossed a river about 20 metres large that has been interpreted as an ancient bed of the river Reghena. Today this river has been diverted to another direction.

The bridge leaned on consolidation wooden poles fixed into the ground. These poles supported stretched rectangular abutments. It has been noticed that, differently from other bridges, these abutments had no beak on their short sides. For this reason it has been hypothesized that the river was of modest capacity or that it had a constant flow. The structure of the bridge was made of a central concrete core and was externally covered by blocks of trachyte of the Euganean hills. The blocks were 30 centimetres thick and were secured together by large lead-fixed iron cramps.

The bridge had three arches: the central one was a raised segmental arch; the lateral ones were semi-circular arches – the western one is visible. The arches were exclusively made of stone and were 7,46 metres large (central arch) and 1,80 metres (lateral arches).

In the first half of the I century A.D. the top parapet of the bridge was restored or constructed with limestone from Aurisina. Two identical inscriptions were engraved on them. They referred to the freedman and “sevir” Manius Acilius Eudamus, upon whose testament the bridge or part of it was constructed. The letters of the inscriptions have a constant height of 14,5 centimetres but the text is not distributed in the same way on both stone slabs. For this reason it is thought that they have been engraved after the placement of the slabs. The original inscriptions are preserved within the archaeological area, detached from the bridge.