A circular enclosure, roughly 35 metres in diameter, was marked on the third edition of the Ordnance Survey six-inch map in 1932. Today, all that remains is a poorly defined scarp, a low earthen edge or slope, curving from the eastern to the southern side of the hilltop. The stream immediately to the west and the small pond visible to the south give the site a quietly purposeful quality; whoever chose this location was clearly attentive to the lie of the land.

Circular enclosures of this kind are common enough across Ireland that they tend to blur together, yet individually they rarely yield easy answers. They may represent the remains of a ringfort, a type of enclosed farmstead used throughout the early medieval period, typically between the fifth and twelfth centuries, and by far the most numerous class of field monument surviving in the Irish countryside. Alternatively, some enclosures of similar dimensions predate that period entirely. Without excavation, the Ballyglass example cannot be assigned confidently to any one phase, and the survival of the site is now too fragmentary to settle the question by surface survey alone. The 1932 map record at least confirms that the enclosure was still legible as a form within living memory, which sharpens the sense of how quickly such features can dissolve back into the pasture.