What survives at Carrownaglogh is barely legible in the landscape, yet its outline has not entirely disappeared. A slightly raised oval, roughly 23 metres north to south and 15 metres east to west, can still be traced in the pasture, and on the north-east arc a remnant bank and scarp persists, with an exterior height of around 0.7 metres and a slope width of about 2.4 metres. Elsewhere the circuit survives only as a faint undulation in the ground, and at the southern edge it is almost imperceptible.

Ordnance Survey maps from 1837 to 1838 recorded the site as a roughly circular enclosure, and the 1922 edition shows it still recognisable, though by then it had been absorbed into a field boundary along its south to west-northwest arc. At some point after that the earthwork was levelled, likely through agricultural use of the land. A property wall now bisects the site centrally on an east-northeast to west-southwest axis, cutting across whatever coherence the original circuit once had. The ground to the north drops away to wettish pasture bordered by a stream, while the fall to the south is more gradual, a topographic situation consistent with the kind of defensible, well-drained prominence that early medieval farmers tended to favour when siting an enclosed settlement.