The rectangular structure, probably dating from the eighteenth century, still stands to several floors, with a stone-faced mill-race, the channel cut to carry water to drive the wheel, running immediately to its west. That channel is relatively narrow at 1.15 metres wide beside the mill itself, but opens out to roughly five or six metres further north before rejoining a stream about 130 metres away. In a rear return at the north end, two rooms survive, one of them still containing a pair of millstones.

The site has a longer history than the standing remains suggest. The Down Survey, a mid-seventeenth-century mapping project that recorded land ownership across Ireland in remarkable detail, shows both a house and a water mill at Milltown in the Forth barony survey of 1656 to 1658. A few years before that survey was made, in 1640, a man named Rowland Scurlocke held 70 acres at Milltown. Whether the mill he would have known is an ancestor of the present ruin, or a separate structure on a different part of the townland, is not entirely clear. The Ordnance Survey six-inch maps of 1839 and 1940 both mark a corn mill here, though again there is some uncertainty about whether the mapped position corresponds exactly to the earlier site.

The remains are overgrown, which means the stonework and the surviving millstones are best appreciated by those willing to push through some undergrowth. The mill-race, tracing its course northward to the stream, gives a clear sense of how the water supply was managed and gives the site a physical logic that is still readable on the ground even in its current state.