The northern portion was lost before 1843, the year the first edition Ordnance Survey six-inch map was produced, which tells us the road was already well established by then. What remains is bisected rather than merely clipped, which gives the site an oddly truncated quality, as though someone had taken a ruler to prehistory.

A rath is a ringfort, the most common monument type in the Irish landscape, typically a circular earthen enclosure used as a farmstead during the early medieval period, roughly between the fifth and twelfth centuries. At Loughbeg, the surviving southern arc retains a surprisingly complete defensive profile. The earthen bank is 2.3 metres wide with an internal height of just under a metre and an external height of 1.6 metres. Beyond it lies a fosse, the encircling ditch that was dug to both define and defend the enclosure, measuring 3.5 metres wide and over a metre deep. A further outer earthen bank, 3 metres wide and roughly a metre high on its outer face, adds a second line of definition. Taken together, the three elements suggest an enclosure that was reasonably well-defended in its time, or at least one whose builders wanted it to look that way. Trees and scrub have colonised both the banks and the interior, which likely accounts for the reasonable condition of what survives.

Directly south-east of the rath sits a well-preserved limekiln alongside its corresponding quarry. A limekiln is a stone-built structure in which limestone was burned to produce quicklime, used historically for fertilising fields and for mortar. The pairing of a limekiln and quarry immediately adjacent to an ancient enclosure is a reminder that these landscapes were rarely used for one purpose alone, and that the ground underfoot in places like Loughbeg carries several centuries of different intentions.