The Ballaghhaugeag Bridge is a mortared limestone structure some twenty metres long and five metres wide, its six round-headed arches arranged along a northwest to southeast axis. The river itself has shifted or narrowed over the centuries and now flows only beneath the four arches to the southeast, leaving the remaining two effectively stranded in damp pasture. Four cutwaters, the triangular or wedge-shaped projections built into a bridge pier to deflect the force of moving water, survive on the upstream side, a detail that speaks to the serious engineering ambition behind what might otherwise look like a modest rural crossing.

The bridge is thought to have origins in the late seventeenth century, though it appears to have been substantially reconstructed in the late eighteenth or early nineteenth century. On the northeast face, the stonework has been rendered over, and on the most southerly arch, the impressions left by plank-centring are still visible. Plank-centring refers to the temporary timber framework erected to support an arch during construction; when the mortar sets and the framework is removed, the grain and texture of the planks can remain imprinted in the underside of the stone. That this impression endures here is a small but legible trace of how the bridge was built or rebuilt. An overgrown roadway extends away to the southeast, the ghost of a route that once gave the bridge its reason for existing, long since abandoned when the modern road and its newer crossing made it redundant.