What survives is a subcircular earthwork, roughly 43 metres east to west and 40 metres north to south, now legible mainly as a low scarp and a shallow external fosse, the ditch that once reinforced the enclosure's boundary. The western to northern arc has been lost to quarrying, which has eaten into the monument and removed whatever surface definition remained there.

A rath, to use the Irish term, is an enclosed farmstead of early medieval date, typically consisting of a circular earthen bank and ditch surrounding a dwelling and its associated outbuildings. They are common across Ireland, though a great many have suffered exactly the kind of attrition visible here. What distinguishes the Slieveroe example, at least in local memory, is the reported presence of a souterrain within the interior. A souterrain is an underground stone-lined passage or chamber, usually associated with ringforts and thought to have served as a place of refuge, storage, or both. At Slieveroe, this feature was said to lie beneath a large limestone slab, though no surface trace of it now remains visible. Whether the slab has been moved, buried under accumulated soil, or simply lost to the same quarrying activity that damaged the western arc is not recorded.