What protrudes into the drain face and field surface is modest in scale, barely a hand's width across and only a few centimetres deep, yet the arrangement points to something deliberate. This is a possible togher, a term for the wooden trackways that people once laid across bogland to make crossing it feasible. Ireland's bogs were not simply obstacles; they were territories that required engineering, and toghers ranging from rough bundles of brushwood to carefully hewn planks represent some of the oldest surviving evidence of organised movement through the landscape.

The Derryvella example is small, roughly four and a half metres in measurable length, and composed of two roundwood elements with diameters between six and twelve centimetres. One piece of wood was identified as hazel, a timber commonly worked in early Irish contexts for its flexibility and availability. The structure was found in a moderate state of preservation where it remained covered by peat, the anaerobic conditions of the bog acting as a natural preservative. The underlying peat itself is a moderately humified sphagnum peat, a type formed from bog moss, with occasional traces of calluna, the Latin name for heather, and small patches of eriophorum, the cottongrass whose white tufts are a familiar sight on Irish upland bogs. These plant remains offer a quiet record of the bog's own history, suggesting the kind of wet, open ground that would have made a timber crossing not merely useful but necessary. No date has been assigned to the structure, and its designation as a possible togher reflects the caution appropriate to a find this fragmentary, but the care of its construction, two parallel elements laid with clear orientation, suggests intention rather than accident.