Somewhere between the first Ordnance Survey of 1838 and the revised edition of 1910, this ringfort effectively vanished from the map. The earlier survey recorded a roughly circular enclosure with an estimated external diameter of around 70 metres, defined by a scarp, a low earthen bank or slope used to mark and defend an enclosed area. By 1910, the monument had been absorbed into a larger rectangular field, and that field's boundaries have since been removed too, leaving a landscape that has been reorganised at least twice over the intervening century and a half.

What survives on the ground today is a very poorly preserved, slightly raised oval, measuring 48 metres east to west and 30 metres north to south, sitting on a gentle rise at the northern edge of the former flood-plain of the Slate River, which flows to the southwest. The enclosing scarp, that low earthen edge, varies considerably in height: just 0.7 metres at the north but rising to 1.8 metres at the east, suggesting uneven survival rather than original variation. Two features have cut into what remains: a hedged farm track, roughly 2 metres wide, truncates the northern side, while a silted-up field drain, about 1.5 metres wide and only 0.2 metres deep, has eaten into the western edge. Ringforts of this kind, known in Irish as raths, were typically enclosed farmsteads of the early medieval period, and thousands once dotted the Irish countryside. Most have survived as earthworks only because they were too awkward to plough away entirely, though this one in Drumsru has come closer to disappearing than most.