Sometime around 1928, the earthwork was levelled, and the low circular enclosure that had stood in level pasture for perhaps a thousand years was largely erased. Yet it has not entirely disappeared. Aerial photography has since revealed the old outline as a cropmark, the buried fosse, a circular ditch enclosing a defended space, and even a causeway entrance to the south-east still faintly legible in the soil beneath the grass.

Ringforts, known in Irish as raths, were the dominant settlement form of early medieval Ireland, typically serving as enclosed farmsteads for a single family and their livestock. The Dreenagh example was modest in scale. The 1842 Ordnance Survey six-inch map recorded it as a hachured circular enclosure roughly 30 metres in diameter, and nearly a century later the 1937 revision still showed a hachured arc tracing the scarp from the south-south-west around to the east. On the ground today, what remains is a circular area of approximately 24 metres across, defined by a slight scarp that weakens toward the south and south-east, with the fosse surviving as a barely perceptible external depression. More intriguingly, the interior once contained a souterrain, an underground stone-lined passage of the kind used in early medieval Ireland for storage or refuge, though its current condition is not recorded here.

The gap between the 1842 and 1937 maps tells a quiet story of gradual loss, and the levelling that followed sometime around 1928 completed what erosion and agriculture had begun. That a causeway entrance and the arc of the fosse are still readable from the air, long after deliberate clearance, suggests how deeply these structures were built into the land.