Beneath a concrete cap, with a metal cover fitted to allow access, lies St. Mogue's holy well, known locally as Tobermogue, the name being a straightforward anglicisation of the Irish "tobar," meaning well, combined with the saint's name. A stone plaque on a plinth erected to the rear is the only outward signal that this is anything more than a piece of Victorian or Edwardian rural infrastructure.

The well's deeper history was recorded by the historian William Carrigan in 1905, who noted that it sits on the roadside roughly three hundred yards north of the old churchyard at Ennisnag. Carrigan also recorded that a pattern was held here until the beginning of the nineteenth century. A pattern, in Irish tradition, was a local pilgrimage and festival held on a saint's feast day, typically involving rounds of prayer at a sacred site, and sometimes a fair or gathering alongside the devotional activity. The fact that it continued into the early 1800s places Tobermogue within a well-documented wave of pattern suppressions during that period, when Catholic and civic authorities alike moved to curtail gatherings they considered disorderly. The first edition of the Ordnance Survey six-inch map, published in 1839, still records the site plainly as "Tobermogue," but by the 1948 revision it had been quietly reclassified as "Pump on Site of Tobermogue," a cartographic demotion that neatly captures how thoroughly the sacred function had been displaced by the practical one.