Irthlingborough Old Bridge and Attached Causeway (That Part in Irthlingborough Civil Parish)

Irthlingborough Old Bridge and the attached causeway, located in Irthlingborough, date back to the mid-14th century, with datestones indicating work in 1668 and 1829. The bridge features a total of 10 double and triple chamfered arches, with the outer arches on the west side constructed with brick voussoirs, likely from 1754. It is built of squared coursed limestone, some sections banded with ironstone, along with limestone ashlar and brick. The bridge has large cutwaters on both sides, with five on the east side that include refuges. A datestone from 1668 on the east side likely marks a restoration, while a plaque featuring the cross keys of St. Peter is located on the west side. A central plaque commemorates the restoration of 1829. Each end of the bridge has an attached causeway consisting of five arches, which were originally part of the bridge. The west side was widened, and the east parapets were renewed and refaced in brick and ashlar, probably during the 1922 work. Medieval arches are still visible within the causeway arches. The bridge was originally constructed as a structure with around 20 arches, likely under the direction of The Abbey of Peterborough, and it is scheduled as an ancient monument.