What makes it quietly compelling is the combination of its scale and its condition: measuring roughly 53.5 metres across its northeast-to-southwest axis, it was once a substantial enclosure, yet today it survives only as a degraded bank with a partially silted external fosse, the ditch that originally ran around the outside of the bank.

A rath, as this type of monument is classified, is the most common archaeological site type in Ireland, a circular or near-circular enclosure built during the early medieval period, roughly between the fifth and twelfth centuries, most likely as a defended farmstead for a family of some local standing. The bank and fosse at Ballytrasna have not been left entirely to nature. Parts of the outer ditch appear to have been artificially steepened and widened at some point, suggesting later interference, possibly to make the depression more useful as a field boundary or drainage feature. The field walls that were recorded on the third edition of the Ordnance Survey six-inch map, published in 1932, have since disappeared entirely from the landscape. What the early twentieth-century surveyors saw, and what exists on the ground today, are two noticeably different things. Two further ringforts survive approximately 270 metres and 300 metres to the southeast, which suggests this corner of north Galway once supported a cluster of early medieval settlement activity, each enclosure perhaps representing a separate farmstead within the same broader community.