A cashel is a ringfort built of stone rather than earth, its boundary defined by a drystone wall rather than a raised bank or ditch, and this one was never particularly imposing to begin with. Today, what remains is a roughly circular enclosure measuring about 30.5 metres across its north-south axis, its wall long since collapsed into a low rubble spread that takes some patience to read as a coherent structure at all.

What makes the site quietly telling is not what survives but what has happened to it. A field boundary cuts directly through the monument from the north-north-west to the south-south-east, and several other boundaries press up against its edges. This kind of incremental encroachment is a familiar story in Irish archaeology; as farms were divided and re-divided across the post-medieval centuries, earlier monuments were treated as convenient quarries for wall stone or simply absorbed into the working geometry of the land. The cashel at Rinn was recorded by McCaffrey in 1952, catalogued as no. 87 in what appears to have been a survey of the area, and at that point it was already described as poorly preserved. Whatever original entrance, internal features, or wall height it once possessed had by then been lost to view.