Modern field fences slice through the interior, dividing what was once a unified enclosure into three separate sections, and gaps cut by those same fences interrupt the bank on the eastern and south-eastern sides. The original entrance, likely a narrow gap on the north-eastern arc, measures roughly four metres wide at the top and two at the base, though even this is uncertain. What survives most legibly is the scarp, a near-continuous earthen bank rising to about 2.7 metres in height on the southern and western arc, with traces of a fosse, the external ditch that typically accompanied such a bank, running alongside it.

Ringforts, known in Irish as raths when formed primarily from earthen banks rather than stone, were the standard enclosed farmsteads of early medieval Ireland, occupied roughly between the fifth and twelfth centuries. The one at Sionhill sits on a high terrace with wide views to the south, south-west, and north, a position that would have suited both practical oversight and a certain social visibility. Its recorded history of measurement and mapping stretches back to the Ordnance Survey's first six-inch map of 1837, which shows a circular earthwork already intersected by a field boundary on the south-eastern side. By the time the revised twenty-five-inch edition was produced in 1913, the shape had shifted in the cartographic record to a D-form, suggesting that continued agricultural use was gradually altering both the monument and how it was being read. A description made in 1970 captured it as a broad oval, roughly 41 metres north to south and 29 metres east to west, with the cultivation ridges visible in the northern interior pointing to a period when even the enclosed space was being turned over for tillage.

The monument remains visible from aerial photography as a partially tree-lined earthwork, the bank and its curve still legible against the pasture, even if the fences and ridges within tell a longer story of a site that has never quite been left alone.