The stone now standing beside St. Olan's holy well in Dromatimore measures 2.4 metres tall and was laid horizontally across the Delehinagh river, walked over by anyone who needed to cross, until 1851. It is an ogham stone, meaning it carries an inscription in ogham, the early medieval Irish script that encodes letters as a series of notches and strokes cut along the edge of a stone. Whatever dignity that implied had, for over a decade, been entirely incidental to its usefulness as a river crossing.

The stone came to light around 1840, when a flour mill being demolished revealed it, along with what appears to have been a second ogham stone. The site is thought to overlie a ringfort, the circular enclosed settlements that were the typical farmsteads of early medieval Ireland, which suggests the stones may have been standing in or near one. After its years as a bridge, the stone was erected in its current position beside St. Olan's holy well in 1851. The inscription on its face is worn and damaged, but the scholar R.A.S. Macalister read it as MADORA MAQI DEGO, a formula typical of early ogham inscriptions meaning roughly "of Madora, son of Dego". Such stones functioned as markers, probably commemorating individuals of local significance, though the specific identities named on them are rarely recoverable beyond the inscription itself.

The stone stands today beside the holy well, a place that already drew visitors for its own reasons, the well being associated with St. Olan, a figure from early Irish Christian tradition. The juxtaposition is quietly layered: a pre-Christian commemorative monument, repurposed as a bridge, now companion to a saint's well. The worn ogham lettering is still visible on the stone's surface for those who look closely enough to trace it.