The connection is plausible rather than proven, and that uncertainty is itself revealing. It points to how long this stretch of river has been put to work, and how difficult it can be, centuries later, to pin a specific building to a specific spot on the ground.

The documentary trail begins in the mid-seventeenth century. The Civil Survey of Limerick, compiled between 1654 and 1656 and later published by Robert Simington in 1938, recorded a millseat in the area, describing it as "mearing on the north wth Twolaghten, and the River of Growdin on the Easte." That river, the Groody, still runs along the eastern edge of the low-lying pasture at Ballysimon today. The Down Survey, a vast mapping project undertaken around the same period to catalogue land ownership across Ireland following the Cromwellian conquest, depicted two medieval mills on its barony map of the South Liberties and on the parish map of Kilmurry, held in the National Library of Ireland as MS 718. Both sources agree that mills existed on the Groody; where they disagree, or at least where ambiguity creeps in, is on exact location. The Down Survey places those two medieval mills further upstream to the west, not precisely where the nineteenth-century OS map would later annotate its own mill. The two medieval sites are recorded separately in the Sites and Monuments Record under references LI005-041 and LI005-042.

The site sits in low-lying pasture on the south-eastern bank of the Groody River at Ballysimon, on the southern fringes of Limerick city. It is not a dramatic or visually obvious destination; there is no standing mill structure described in the source record, and the interest here is largely cartographic and archival rather than architectural. Visitors with an appetite for landscape history might find it worthwhile to compare the 1840 OS six-inch sheet with the Down Survey reproductions held in the National Library, to trace how the same river corridor was recorded across two very different moments of Irish history. The Groody itself remains the most legible constant in the story.