No earthwork, no raised ground, no visible trace of any kind survives in the pasture that now covers the site. Yet for well over a century, Ordnance Survey maps recorded something here: a rath, the Irish term for a ringfort, one of the circular earthen enclosures built throughout Ireland during the early medieval period, roughly between the fifth and twelfth centuries, and used as enclosed farmsteads by farming families of varying social rank. The 1842 six-inch map shows it as a hachured circular enclosure of around twenty-five metres in diameter. Later editions, from 1905 and 1936, still depict it, though by then measuring closer to twenty-two metres across, suggesting some gradual erosion or perhaps a slight difference in how the surveyors read the ground.

The site survived on paper long after it had begun to diminish in reality, but it did not survive the late twentieth century. According to local information, the rath was levelled around 1978 during land reclamation work. This was not an unusual fate. Across Ireland, thousands of ringforts were removed during the agricultural intensification of the 1960s and 1970s, when land drainage schemes and mechanised clearing made it practical, and sometimes financially incentivised, to eliminate the bumps and banks that had previously been left alone, whether out of practicality or the older folk belief that raths were fairy forts best left undisturbed. The one at Killabraher joined a long list of sites that exist now only as map annotations and inventory records, their physical presence replaced by level grazing land.