The structure at Loughgirroga is not the sort of fort that announces itself with dramatic earthworks or towering walls. Instead, it presents as a broad spread of stone, roughly subcircular in plan, measuring around 31.6 metres on its north-east to south-west axis and 28 metres across the other way. The stone spread forming its perimeter ranges between three and five and a half metres wide, and rises only half a metre to a metre above the surrounding ground. No facing stones survive, and there is no visible entrance, which makes the whole thing feel less like a monument and more like a memory of one.

This kind of structure is generally classed as an enclosure, a term that covers a broad range of prehistoric and early medieval features defined by banks, ditches, or stone walls, often of uncertain function. The absence of dressed or facing stones here suggests either a very simple original construction or considerable degradation over time, most likely both. What adds a quiet puzzle to the site is the presence of a second, separate stone spread just outside the main perimeter to the north-west, measuring 3.5 metres wide and about half a metre high. Whether this represents an outwork, a secondary feature, or something else entirely is not clear. The site was recorded as an enclosure in both the Sites and Monuments Record in 1992 and the Record of Monuments and Places in 1996, which gave it a degree of formal protection, though its origins and original purpose remain unresolved.

The setting in hazel woodland, on a gentle rise, is itself worth noting. Hazel woodland in Ireland was historically associated with boundaries and marginal ground, and enclosures like this one were often positioned on the edges of more intensively used land. Visitors approaching the site should expect the woodland to obscure the full extent of the stone spread until they are quite close to it, and the low relief of the remains means careful attention is needed to trace the circuit of the perimeter at all.