No earthwork, no bank, no trace of the mill that replaced it. The site at Mountrivers is notable precisely for what has been removed from it, layer by layer, across several centuries.

Ringforts, known in Irish as raths, were typically enclosed farmsteads of the early medieval period, defined by one or more earthen banks. At Mountrivers, that enclosure was levelled at some point before the nineteenth century, and a flour mill was subsequently built on the cleared ground. When that mill was itself demolished around 1840, two ogham stones came to light. Ogham is an early medieval script, used primarily in Ireland between roughly the fourth and seventh centuries, in which letters are represented by notched lines cut along the edge of a stone. Antiquarians Richard Rolt Brash, writing in 1879, and R. A. S. Macalister, in his 1945 corpus of ogham inscriptions, both recorded the stones, as did P. J. Hartnett in 1939, who noted that the mill had stood on the site of what he called "an erased ring fort." The stones may have been embedded within the fort's structure originally, only surfacing when the mill was pulled down. Both the ringfort and the mill are now gone without surface trace, leaving a level pasture that gives no indication of the sequence of occupation and destruction it quietly contains.