It was not built from planks or dressed timber, but from roundwood laid lengthways, one layer deep, forming a simple but deliberate path across ground that would otherwise have been impassable. At roughly 69.5 metres long and 1.5 metres wide, it is not a grand thoroughfare; it is something more provisional, a quiet piece of practical engineering that happens to have survived.

This kind of structure is known as a togher, the Irish term for a wooden trackway built across bog or wetland. Tógher construction was a widespread response to the challenges of moving through Ireland's extensive peatlands, and examples have been found across the country ranging from simple arrangements of branches to more elaborate multi-layered platforms. The Killoran example is classified as a class 2 togher, indicating its single-layer roundwood construction. Dendrochronological or radiocarbon analysis has dated it to between 838 and 799 BC, placing its construction firmly in the Late Bronze Age, a period when communities across Ireland were clearing land, trading goods, and evidently investing effort in maintaining routes through difficult terrain. The wood has been preserved by the anaerobic, acidic conditions of the bog, the same environment that has kept countless organic materials intact across the island for millennia.