Measuring just over seven and a half metres wide, it carries its east-west route on three segmental arches, the kind of shallow, gently curved form that became common in Irish road building during the early nineteenth century as improved turnpike networks pushed through previously awkward terrain. What gives this structure a certain quiet interest is the mix of materials in its construction: the main fabric is random ashlar sandstone with a rock-faced finish, rough and practical, while the voussoirs forming the arch rings are dressed limestone, a more precise material chosen where structural load demanded accuracy. The cutwaters, those blunt wedge-shaped projections on either side of the piers that split the river current and protect the masonry beneath, are also cut limestone, and the parapet wall facing the road is finished in coursed ashlar limestone. It is the kind of economical material logic that speaks to how builders of the period worked with what was locally available and reserved finer finishing for the parts under most pressure.

The bridge dates in appearance to the early or middle decades of the nineteenth century, a period of considerable infrastructure investment across rural Ireland, much of it driven by grand jury presentments and, later, Board of Works schemes that pushed new roads and river crossings into areas where travel had previously been seasonal or unreliable. No specific builder or patron is recorded for the Boolymore crossing, but its form is consistent with the competent, unfussy contractor work of that era. One further detail is worth noting: stone paving survives in the river to the south of the structure, a remnant that may relate to a ford or earlier crossing at the same point, or to works intended to protect the riverbed from scour around the abutments.