But the bridge at Ballynaglogh in County Cork carries a small collection of details that reward a closer look. Two semicircular arches span the water, their curves formed from coarse voussoirs, the wedge-shaped stones that lock together to carry the weight of an arch without mortar doing the heavy lifting. On the upstream face, a pointed breakwater juts out into the current, angled to divide the flow and protect the piers from the full force of the river in spate.

The combination of semicircular arches and a pointed upstream breakwater is characteristic of traditional Irish road-bridge construction, a form that remained largely consistent from the medieval period well into the eighteenth and nineteenth centuries. The Glashanabrack is a modest river in east Cork, and a bridge of this type would have served as a practical crossing for local traffic, its dimensions suggesting it was built to accommodate carts and livestock as much as foot passengers. The coarse voussoir work, rather than finely dressed stone, points to local construction using whatever material was readily available nearby, giving the structure an unpolished solidity that has clearly served it well.