Recorded in 1999, the spread measures roughly eight metres east to west and five to six metres north to south, with a second, closely related spread sitting just five metres to the north-north-west. What these remains actually represent is uncertain, though one plausible reading is that both spreads are the remnants of a single burnt mound that has been levelled over time, its combined footprint stretching to perhaps fifteen metres.

Burnt mounds are among the most common prehistoric monument types in Ireland, typically consisting of a heap of fire-cracked stones dumped beside a trough or hearth. The working theory is that stones were heated and dropped into water-filled troughs to boil the water, possibly for cooking, bathing, or industrial processes, though the precise function remains debated. What makes the Ballyglass Middle site particularly interesting is not any one spread in isolation but the density of similar remains in a very small area. A further burnt mound lies around twenty metres to the north-west, and another has been absorbed into a field boundary wall roughly fifteen metres to the north, its prehistoric fabric quietly repurposed into an agricultural landscape. That four related features should cluster so tightly in boggy ground at a ridge base suggests the location was deliberately and repeatedly returned to, perhaps because of reliable access to water or fuel, or simply because it already carried the memory of use.