At 7.8 metres wide and oriented on a north-south axis, it is broad enough to pass unremarked by most drivers, yet a closer look reveals that no two parts of it are quite the same. The southern end has four segmental arches, each spanning around six metres, with low pointed cutwaters on the upstream face of the piers. Cutwaters are the wedge-shaped projections built onto bridge piers to split the current and reduce pressure on the structure. Moving northward, five inserted central arches appear, slightly narrower at around five metres each, with cut-stone rounded cutwaters rather than pointed ones, and three sloping buttresses on the downstream side. The northernmost arch is different again, its voussoirs, the wedge-shaped stones that form the curve of an arch, finished in a rockface rusticated style that gives them a deliberately rough, raised texture. Iron braces have also been driven through the bridge at the northern end, suggesting repairs made when the structure needed reinforcement.

What makes Beaufort Bridge particularly interesting is what it was built from. Local tradition holds that the stone used in its construction was taken from Pallis Castle, a now-ruined tower house that stands nearby. Robbing material from older or defunct structures was a common and pragmatic approach in rural Ireland, and it means that the fabric of the bridge may contain dressed stone that was first cut and laid for an entirely different purpose, possibly centuries earlier. The bridge itself is described as multiperiod, meaning its construction and modification spans more than one distinct phase, which accounts for the inconsistencies in arch heights, spans, and cutwater shapes across its length. A narrow linking arch connects the southern and central sections, hinting at a join where an earlier crossing was extended or rebuilt rather than replaced wholesale. The parapet wall has been much rebuilt over time, and vertical stone coping survives in places along its length.