Whether this was understood as a miracle, a warning, or a straightforward statement of observed fact is not entirely clear, but it was recorded with conviction, and it hints at the kind of local devotion that gathered around such places for well over a thousand years.

The well sits at the centre of a small enclosure near Castlegar, contained within an oval drystone surround measuring roughly 1.8 metres across, entered through a narrow gap on the western side. The present enclosing wall appears to have been built over an older structure, the foundations of which still extend outward to the north and east, suggesting the site has been maintained and rebuilt across several generations. A crucifixion plaque, dated to the 18th or early 19th century, rests against the northeast side-wall. The saint associated with the well is St Cuan, who died in 752, and who was recorded by the nineteenth-century scholar John O'Donovan as still being held in considerable veneration in the area of Ahascragh in his own time. Each year on the 15th of October, St Cuan's feast day, a pattern was observed at the site. A pattern, in Irish tradition, is a local pilgrimage combining prayer, ritual circuits, and often communal gathering, typically centred on a holy well or a saint's grave. A second well, referred to as Tobar Grealláin and mentioned in earlier local sources, was once said to be nearby; when the area was examined in 1984 no trace of it could be found, though the saint it commemorates, St Grellan, has a separate association with the medieval church at Kilcloony.

The well is a National Monument in State care, which at least guarantees a degree of formal protection for a site that might otherwise easily be overlooked. The layered stonework, the plaque pressed against the inner wall, and the faint outline of foundations reaching beyond the current enclosure all reward a closer look than the modest scale of the structure might initially suggest.