The bridge is built of random rubble, meaning the stones were laid without the strict coursing of dressed masonry, yet its five segmental arches are finished with roughly shaped voussoirs, the wedge-cut stones that form an arch, and cut-stone keystones at each crown. The combination of rough fieldwork and more deliberately shaped elements points to the kind of practical, economical building common to rural Kerry.

The most telling detail sits on the upstream face of the piers. Three low pointed cutwaters, built of ashlar, the smoothly cut and precisely fitted stonework, appear to be later additions rather than original features. Cutwaters are projections built out from a bridge pier to divide the current and reduce pressure on the structure; the fact that these were added in a noticeably finer material suggests the bridge was reinforced at some point after its initial construction. By 1846, when the Ordnance Survey completed its six-inch mapping of the area, the bridge was already known locally as Mill Bridge, a name that implies a working mill somewhere nearby on the Deenagh and hints at the commercial life this crossing once served.