It measures just twenty-seven centimetres wide and eleven centimetres deep, and it runs east to west through the wetland, preserved by the same anaerobic conditions that have kept Irish bog timbers intact for thousands of years. That one plank constitutes a road is not absurd; it is simply how such infrastructure worked in early medieval Ireland, when crossing a bog on foot required something more reliable than luck.

The timber is classified as a togher, the Irish term for a trackway or roadway laid across boggy or marshy ground. Toghers range considerably in their construction, from elaborate multi-layered platforms of wood and brushwood to the most minimal intervention possible, which is what Cloonmore represents. A class 3 togher, by definition, is among the simplest type, typically consisting of a single longitudinal plank or timber rather than a corduroy of logs or a built-up surface. Here, that timber is a half-split oak log, meaning the trunk was split lengthwise to create a flat upper face, which would have offered a firmer, more even surface underfoot than a rounded log. Oak was a practical choice in such contexts, being both dense and relatively resistant to decay, though the bog itself has done most of the preservation work. The record of this particular togher derives from fieldwork carried out by the Irish Archaeological Wetland Unit, based at University College Dublin, which systematically documented bog roads across the Irish midlands before many such features were lost to peat harvesting.