Along the western gable, a wheel pit measuring just over one and a half metres wide was hewn directly from the rock, a detail that speaks to the effort involved in establishing a working mill on this particular stretch of ground.

The structure is modest in scale, roughly five and a half metres long and of similar width, but the rock-cut wheel pit is the element that sets it apart. A wheel pit is the channel or recess that housed the waterwheel, directing flow beneath or against the wheel to generate the rotational force that powered the millstones above. Cutting that pit from solid rock rather than constructing it from masonry was a significant undertaking, suggesting either that the geology here made conventional construction impractical, or that permanence was the priority. The mill stands to the north of the Argideen River, which drains much of the Bandon and Timoleague hinterland before reaching Courtmacsherry Bay, and would have provided the necessary water supply. Beyond its physical dimensions and its relationship to the river and the nearby house, the documentary record for this particular site is thin, leaving the mill as something to be read largely from what survives in the ground.