A togher, as these structures are known, is a wooden trackway built across wet or marshy ground, a practical solution to the perennial problem of moving through bogland. The one at Derrindiff is no modest example: when investigators traced its extent in 1999, it ran for over 400 metres across nineteen fields, reaching up to four metres in width at its broadest point.

Radiocarbon dating carried out following excavation in 2001 placed its construction at around 1412 BC, placing it firmly in the Bronze Age. The Irish Archaeological Wetland Unit from University College Dublin had first examined the site in 1991, and the picture that emerged over subsequent years was of a carefully engineered structure. Large half-split oak planks formed the upper surface, laid lengthwise along the track. Beneath them, short transverse pieces of roundwood provided support, and beneath those again ran longitudinal layers of brushwood and smaller roundwood. Wooden pegs held the assembly in place. At different points along its length the construction varied slightly, with compact brushwood beds flanking a central oak core in one section, and split timbers taking that flanking role in another. Ash roundwood and hazel brushwood were also worked into the fabric of the road, and several of the timber elements showed clear signs of deliberate woodworking. The structure did not remain in isolation for long in archaeological terms; an Iron Age platform was later built directly on top of it, suggesting the area continued to attract activity for centuries after the original road had gone out of use. A single large oak plank, measuring 6.5 metres in length and bearing three mortice notches as well as a large oval knot-hole possibly adapted as a further mortice, was found on a headland some 300 metres to the north-east, and is thought to have been displaced from the togher at some point. By 1999, sections of the structure were either already exposed at the field surface and being damaged by milling equipment, or close enough to the surface to be at serious risk.