It is unassuming by any measure, but for at least a century it was the focus of a precise annual ritual: on the 15th of August, the feast of the Assumption of the Virgin, people came here to perform "rounds". The practice of making rounds at a holy well involves walking a set circuit around the site, often a prescribed number of times and in a particular direction, sometimes accompanied by prayer or the recitation of specific intentions. It is a form of devotion with pre-Christian roots, absorbed into Irish Catholic practice and attached to the rhythms of the liturgical calendar.

The record of what happened here comes from O'Leary, writing in 1918 to 1919, who noted the Lady's Day rounds at this spring. The 15th of August, known in Ireland as Lady's Day, was one of the most widely observed dates in the holy well calendar, a point in late summer when communities gathered at local sacred sites across the country. Whether the well at Kilnahone was ever formally enclosed, named for a particular saint, or marked with a cross or statue is not known from what survives. What remains is the spring itself, visible in the wet ground beside the river.