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It is located to the west of the town, below the castle. Due to its excellent position, it defended the Ebro crossing of the border between Navarre and Castile. It is possible that its existence dates back to 1172, when the town received the charter from Sancho the Wise of Navarre. However, the oldest preserved part may date back to the 13th century, with a Romanesque structure. It consisted of thirteen pointed arches, on triangular cutwater basins and rectangular spurs and two defensive towers, one in the centre and probably another at the entrance on the left bank. This construction was rebuilt at the end of the 16th century, transforming it into a bridge with twelve arches and a single tower. It is built in ashlar and masonry. It currently has nine arches, of different spans and shapes: the first three, which are the oldest, are pointed, the next three are semicircular, the seventh is elliptical, the eighth is bell-shaped and the ninth is semicircular. It rests on pillars with nine cutwaters of different shapes (triangular, pointed and semicircular) and nine rectangular spurs. The roadway has a slightly sloping profile from the right bank to the left, and has nine sidings or landings corresponding to the elevation of the buttresses. It is flanked by parapets for the protection of pedestrians, built of large ashlars.
Although its origin is medieval, it has been constantly rebuilt since the 16th century. On 9 March 1783, two of its arches collapsed completely, and to facilitate transit between the two banks, a boat with a fixed breakwater was built, and reconstruction work was delayed for more than 60 years. Due to structural problems, heavy traffic was suspended years ago and in 1997 a new bridge was opened to connect San Vicente and Briones, downstream from the old one. This new bridge, 320 m. long and 13 m. wide, is made up of two 90 m. spans, two 45 m. spans and two 25 m. spans.
