A roughly circular enclosure, measuring approximately 25 metres north to south and 29 metres east to west, was recorded on the first edition Ordnance Survey six-inch map of 1839, drawn with enough confidence to suggest it was clearly visible to the surveyors who passed through. Today, nothing remains above ground.

The enclosure's disappearance can be dated, at least approximately, to the period between the 1839 survey and the revised six-inch mapping carried out in 1946 and 1947. Its absence from that later revision suggests it was levelled sometime during those intervening decades, most likely through agricultural clearance. Circular enclosures of this kind are among the most common monument types in the Irish landscape; many are the remains of ringforts, or raths, which served as enclosed farmsteads during the early medieval period, roughly the fifth to twelfth centuries. Others may be earlier in origin. Without excavation, the precise nature and date of the Ardaloo example cannot be determined. What can be said is that it was substantial enough to be mapped, and that it is now gone.

There is nothing to see at the site today. The ground gives no indication that anything once stood or was enclosed there. Its interest lies entirely in that gap between two maps, and in what the gap represents: a monument that survived for centuries, perhaps millennia, and was then erased within living memory of our own time.