When the Ordnance Survey mapped Kilcully in 1842, its six-inch sheets showed four mills operating in this small Cork townland, which speaks to how intensively the river was being put to work. That industrial concentration has since collapsed to a single roofless shell, built hard against a steep cliff face, which gives the structure an oddly compressed quality, as though it was wedged into the landscape rather than placed upon it.

The remains are those of a three-storey rectangular building, measuring roughly 7.1 metres east to west and 6.1 metres north to south internally, with gabled ends and brick quoins at the corners. Quoins are the dressed stones or, in this case, brick units used to reinforce and define the corners of a wall, and their presence here alongside cut stonework suggests a building of some solidity and intent. Along the eastern gable, a wheel-pit survives, cut stone lined, which is where the water wheel would have been housed as it turned on the power drawn from the Glennamought. Inside, four large limestone slabs run along the southern wall; these are support slabs, almost certainly the bases on which the milling machinery once rested. Together, the wheel-pit and the slabs give a surprisingly legible picture of how the building functioned, even in its current roofless state.