When the Ordnance Survey produced its six-inch map in 1840, the cartographers labelled this spot 'Old Mills', suggesting the site was already understood to be well past its working life. That label, applied to three rectangular structures shown beside a cut water channel leading off the White River, tells us that by the time anyone thought to map it systematically, the place had long since fallen into disuse.

The 'Old Mills' annotation on the 1840 OS map is more than a casual description. In the context of Irish cartographic convention, such phrasing generally implies a pre-1700 origin, meaning this may well be a mill site with roots stretching back several centuries before the first Ordnance Survey teams arrived in the area. Mills of this type were typically built to harness a reliable watercourse, with a channel, or mill race, cut to control the flow of water onto a wheel. Three separate rectangular structures appearing together beside such a channel suggests this was once a working complex of some scale rather than a single isolated building. The site also appears to correspond with a possible settlement recorded on the Down Survey Barony map of Connello, a seventeenth-century mapping project carried out under the supervision of Sir William Petty following the Cromwellian confiscations. That a mill and a settlement seem to occupy the same location on both maps is consistent with how rural communities functioned; milling was a communal necessity, and mills often formed the economic core of small local populations.

The site lies in woodland on the eastern bank of the White River, within the historic barony of Shanid in County Limerick. Access to this kind of riparian woodland site can be uneven at any time of year, and the remains themselves are likely to be fragmentary, with structural outlines more readable in late autumn or winter when ground vegetation has died back. Anyone visiting should expect to do a fair amount of looking rather than finding things immediately obvious. The water channel cut from the White River is the feature most worth tracing, as it gives the clearest sense of how the mill complex was laid out and where the working machinery would once have sat.