What distinguishes it from the many similar sites scattered across the Irish countryside is the density of crosses worked into its stonework. The well is covered by a small stone-built structure, roofed with a lintel into which a cross has been carved, and inside the enclosure a recess has been set into the wall. More striking still, roughly engraved crosses appear across both the interior and exterior surfaces of the wall, accumulating in a way that speaks to repeated, individual acts of devotion rather than a single programme of construction or decoration.

Holy wells in Ireland occupy a peculiar position between pre-Christian water veneration and later Catholic practice. Many were adopted into the church calendar and associated with particular saints, becoming sites of patterns, the local term for festive gatherings held on a saint's feast day, during which pilgrims would pray, walk prescribed circuits, and leave votive offerings. The carved crosses at Ballybrack are consistent with this kind of long-term folk religious use, each mark potentially left by a different hand across an unknown span of years. A rectangular enclosure recorded approximately 130 metres to the west may indicate that the well formed part of a wider complex of early religious or ceremonial activity in the area, though the relationship between the two features is not fully documented.