That damage was already done by 1919, when an Ordnance Survey six-inch map recorded the hollow clearly, which means the quarrying belongs to an earlier period entirely, its purpose now unrecoverable. The rest of the earthwork survived, and what remains is a raised oval platform sitting on a natural rise in pasture land, its edges softened by hawthorn, gorse, and brambles.

A rath, as ringforts of this type are commonly known, is a roughly circular enclosure defined by an earthen bank and ditch, typically dating from the early medieval period and associated with farming settlements and their livestock. At Mullenmadoge, the enclosure is oval rather than perfectly circular, measuring about 32.7 metres from north-west to south-east and 41.5 metres across the other axis. Its defining feature is a scarp, an abrupt slope in the ground rather than a built-up bank, which reaches a height of 2.2 metres on the north-western side where the natural fall of the land amplifies the effect considerably. On the north-eastern to east-south-eastern arc, the scarp has been absorbed into a later field boundary, its outer face cut vertically in the manner of a working agricultural bank. The interior slopes gently down from its centre toward the north-east and south-east, and a small shallow pit near the south-eastern scarp is thought to be nothing more dramatic than a collapsed animal burrow. From the rise on which the rath sits, the ground falls away for around 250 metres toward the Sonnagh River, and the views open out north-east to south-east across the river's course and over a low basin of bog and reclaimed pasture stretching to the east.