That double appearance, and the uncertainty about whether the two depictions even refer to the same structure, is almost all that survives of it.

The older of the two sources is the Down Survey barony map, produced between 1656 and 1658. The Down Survey was a vast cartographic project commissioned by the Cromwellian administration to document landownership across Ireland as a prelude to redistribution, and its maps preserve details of the pre-Cromwellian landscape that would otherwise be lost. At the time of the survey, Ballykelsh was counted as part of Hillcastle townland in Kilscoran parish, and a windmill is clearly marked there. Records show that in 1640, a man named Mathew Hay owned 98 acres in that part of the parish, though no direct connection between Hay and the mill is stated. By 1839, when the Ordnance Survey was producing its first systematic six-inch maps of Ireland, a windmill was again marked at Ballykelsh. Whether this was the same building, a rebuilt successor, or simply a cartographic echo of the earlier map, cannot be established with any confidence. The structure does not survive today in any form.