At 8.85 metres wide, it is not a narrow packhorse crossing, but a proper road bridge, built to last and evidently built with care. Three semicircular arches carry the span, each framed with dressed voussoirs, the carefully cut wedge-shaped stones that lock an arch together and give it its strength. Pointed breakwaters, the angular projections built out from the piers to split the current and deflect flood debris, extend upstream and downstream, a practical detail that speaks to long familiarity with how the Glashaboy behaves in heavy rain.

The combination of semicircular arches, dressed stonework, and pointed breakwaters places this firmly in the tradition of Georgian and early nineteenth-century road bridge construction in Munster, a period when county grand juries were financing improvements to the road network across Cork and the craftsmanship of local masons was at a high point. No precise date of construction is recorded, but the confident cut of the stonework and the considered engineering suggest a bridge built not in haste but as a piece of lasting infrastructure.