What survives, if you know where to look, are subtle earthworks on the river's western bank, and a faint linear ridge running parallel to the water that may once have been a mill race, the channel cut to direct water onto a wheel and keep it turning through every season.

The story of this mill can be pieced together from two remarkable seventeenth-century sources. The Down Survey, carried out under Sir William Petty between 1656 and 1658 to map confiscated Irish lands for Cromwellian redistribution, depicts the watermill on the western bank of the Groody at a bend in the river, southeast of Knockatanacashlane Castle. A more detailed parish-level Down Survey map, held at the National Library of Ireland (MS 718), shows it clearly: a rectangular single-storey building with a waterwheel set into its western gable. The Civil Survey of 1654 to 1656 adds a crucial detail, recording that the Lord of Brittas owned the lands of Knockatanacashlane and that on them stood "a Castle and a Mill in reparation," meaning the mill was undergoing repair at the time of survey, suggesting it was still considered worth maintaining. The townland name Knockatanacashlane itself translates roughly as "hill of the old castle," and by the early twentieth century the antiquarian Lynch, writing between 1911 and 1913, noted that nothing remained of that castle save portions of its bawn walls. A bawn is the defensive enclosure, typically of stone, that surrounded an Irish tower house or castle. The 1840 Ordnance Survey six-inch map still shows the river bend where the mill once stood, though the structure itself had disappeared from the record long before that.

The site lies on the western bank of the Groody River near the village of Caherconlish in County Limerick, west of Boskill House in the townland of Templemichael. There is no standing structure to visit, and the earthworks are most legible through aerial orthophotography available via the Ordnance Survey Ireland viewer rather than on foot. If you do walk the riverbank, the linear earthwork south of the mill site is the feature most worth seeking out, low, unassuming, and easy to dismiss as natural ground variation unless you are looking for it deliberately.