The Roman bridge was unique in that it was not fixed but consisted of a pontoon-style bridge of boats, with towers and drawbridges at each end. The boats were secured in place by anchors and were tethered to twin towers built just upstream of the bridge. This unusual design was a way of coping with the river's frequent violent floods, which would have made short work of a conventional bridge. Nothing remains of the Roman bridge, which has been replaced by a more modern bridge near the same spot.