This is the kind of fort where the builder's logic is still legible in the landscape: rather than constructing a full circuit of earthen banking, whoever raised this enclosure let the 2.5-metre drop to the Aherlow do the heavy lifting on one side, then added a scarp and external fosse, a ditch designed to slow or deter approach, around the remaining arc from north-east, through east and south. The result is a semi-circular raised interior roughly 30 metres north to south and 40 metres east to west, its flat-topped platform tilting gently toward the west-northwest, with the river forming both a natural boundary and a ready-made wall.

The monument was already old enough to be recorded cartographically when the Ordnance Survey first mapped the area at six-inch scale in 1840, where it appears as a roughly D-shaped earthwork bisected at the north by the townland boundary between Ballynamuddagh and Barna. By the revised 25-inch edition of 1897, the raised platform and eastern fosse were more clearly delineated. When the Archaeological Survey of Ireland carried out a ground survey in 1999, the external fosse measured 6.1 metres in overall width with a base width of 2.1 metres, and a drain was found running outward from the southern and western margins. The site was compiled formally in the record by Fiona Rooney, with details uploaded in November 2021.

The fort sits in pasture on a slight west-northwest-facing slope, and while aerial and satellite imagery taken between 2011 and 2013 shows the monument clearly as a tree-covered rise, the margins of the interior are described as densely overgrown at ground level. Two gaps in the eastern and southern scarp, each around 1.4 metres wide, are thought to be livestock openings created in more recent times rather than original entrances. Anyone approaching the site should be aware it is in working farmland, and the most useful reference remains the ASI sketch plan. The fosse along the eastern arc is the clearest feature to trace on foot, while the northern edge, where the earthwork meets the river scarp, gives the clearest sense of why this particular bend in the Aherlow was chosen in the first place.