What survives measures roughly six metres east to west and just under five metres north to south, a modest footprint for something that people once crossed and re-crossed for generations. The structure is a togher, a type of ancient Irish trackway built from brushwood and timber laid across waterlogged or boggy ground to create a passable surface. Bogs, which preserve organic material remarkably well due to their low-oxygen, acidic conditions, have yielded dozens of such trackways across Ireland, ranging from modest local paths to substantial engineered roads.

The Derryfadda togher has been dated to between 515 and 365 BC, placing it firmly in the Iron Age. That date range also helps explain its condition: the damage visible in the archaeological record is attributed not to later interference or land clearance, but to the sheer volume of use the track received during its own working life. Whatever route it served mattered enough to people at the time that it was gradually worn down by the traffic passing over it. That detail, easy to overlook in a dry site description, carries a quiet suggestion of a community in motion, crossing the bog repeatedly for reasons now impossible to know, whether for trade, seasonal movement, or access to resources on the other side.