A togher, as these structures are known in Irish archaeology, is a timber trackway laid across soft or waterlogged ground to make it passable, and the example at Cloonmore is among the more precisely dated of its kind. Radiocarbon analysis placed its construction within the narrow window of 393 to 387 BC, deep in the Irish Iron Age, when the only tools available for shaping wood were likely bronze or, just possibly, early iron blades.

The togher was originally identified extending across seven fields, running roughly west-south-west to east-north-east for a recorded length of around 80 metres, and between two and three metres wide. It was constructed from tightly packed longitudinal roundwood, with brushwood laid alongside it, the timber ranging from slender rods of about a centimetre in diameter up to poles of 25 centimetres. Much of it was visible at or near the field surface, and portions could be seen in the faces of drainage cuts at depths of up to 35 centimetres. At the time of the original survey, some of it was actively being milled, meaning the machinery used to harvest peat was already eating through it. Excavation in 2002 clarified the picture further: roughly 60 metres of the structure consisted of the dense roundwood construction, while the remaining 40 metres appeared to transition into a series of smaller brushwood platforms continuing along the same line, perhaps a lighter or more improvised section of the route. One particularly telling detail emerged during earlier investigation: a piece of brushwood with a worked end cut into six facets, two of them stepped, in a manner that suggested the use of a metal blade rather than a stone tool, a small but significant clue about the technology available to the people who built it.