At Loumanagh, the fort has been levelled almost entirely, yet the ground still betrays its presence: a shallow, saucer-shaped depression roughly 27 metres across, with a low rise of just 36 centimetres surviving along the eastern to northern arc, and a slight scarp defining the rest of the circuit. It is the kind of site that rewards attention precisely because so little remains.

The 1842 Ordnance Survey six-inch map recorded it clearly as a hachured circular enclosure of approximately 30 metres in diameter, the hachuring being the cartographic convention used to indicate an earthen bank. By the time it was examined on the ground, that bank had been ploughed or grazed away, leaving only the ghost of the original form. One detail in particular speaks to the care with which it was originally constructed: the interior was deliberately raised on the southern side to counteract the natural fall of the south-facing hillslope, creating a level platform within. This kind of engineered levelling is characteristic of rath construction, rath being the Irish term for these earthwork enclosures, thousands of which dot the Irish countryside, most dating to between the sixth and tenth centuries.