A fulacht fia is essentially a prehistoric cooking or industrial site, typically consisting of a horseshoe-shaped mound of fire-cracked stone built up beside a water source over repeated use. Here, the water source is a stream immediately to the west, exactly the kind of proximity that characterises these sites across Ireland.

The mound was recorded on Ordnance Survey six-inch maps in both 1842 and 1905, appearing simply as an earthen rise in the field. That longevity on the map record suggests the feature was visible and distinct for generations, even as the land around it was farmed. A more complicated question surrounds a note made by Bowman in 1934, who recorded what he described as a fort on land belonging to a D. Watson in the same area, with a rampart roughly three feet high and a diameter of seventeen yards, positioned about four yards to the southwest of a nearby fulacht fia. Whether that structure and the Ballygrady site are one and the same, or two distinct monuments in close proximity, remains unclear. What is certain is that a second fulacht fia lies immediately to the east, making this a small cluster of related prehistoric activity beside a single watercourse. The surface has been recently ploughed, which will have disturbed the upper layers of burnt material but also brought subsurface evidence closer to view.