The roman bridge (fig. 4) at Patras was discovered in the early 1980’s. It is the best preserved two-arched bridge in Greece and composed part of the public roman road that connected Patras with Aegion and Corinth. The bridge is the third one that was built over the river Kaliinaos during the ancient times, was constructed during the end of the 4th century A.D. and was in use until 6th century A.D. when a flood buried it along with the road. Its length is 21m, its height is over 4m and its width 4,25m. The bridge was built with bricks but the pillars where it stands were made of stone. The bridge’s road was paved with slabs. For the protection from floods the bridge is exalted in its middle while the banks of the river have anti-flood devices.

The first one, carried out during Trajan’s building programme (A.D. 114/115) is a single arch bridge. From the second bridge which is dated from between 276 A.D. and 283 A.D. as it is concluded by an incorporated in the third bridge inscription no trace was left.