Measuring roughly 9.5 metres in diameter and rising just over a metre in height, it is a round-topped earthen mound of the kind built during prehistory to cover the remains of the dead. What was once a fosse, a shallow encircling ditch, ran around its base, though that boundary has softened considerably over the centuries. The western edge now shows evidence of having been caught by farm machinery at some point, and gorse has taken hold across part of the surface, giving it the slightly unkempt look of a feature the landscape has been quietly absorbing for a very long time.

The mound was recorded by Hartnett in 1957, and later work by Keeling in 1983 placed it within a much larger picture. Keeling identified this barrow as part of an extensive barrow cemetery in the area, designating it Site I in that grouping. A barrow cemetery is simply a concentration of these burial mounds in close proximity, suggesting that a particular stretch of land held ceremonial or funerary significance across generations. The Knockbrack example sits to the south of a townland boundary, a detail that may or may not be coincidental, since prehistoric monuments and later administrative boundaries occasionally share alignments that hint at long continuity in how a landscape was understood and divided.

The mound occupies a position that would have offered extensive views across the surrounding countryside, which is typical of barrow placement; elevation and visibility seem to have mattered to the people who chose these locations. The site sits within tillage land, so access will depend on the farming calendar and the goodwill of the landowner. There is no formal public access or visitor infrastructure. For those who do get close, the clearest reading of the monument comes from the slight rise of the mound itself against the field surface, and from the line of the old fosse, which remains faintly legible around the eastern side despite centuries of cultivation pressing in from every direction.