Twenty-nine of them were identified within Killoran townland alone, each one a togher, the Irish term for a trackway built across waterlogged or boggy ground by laying timber flat against the earth. The practice was widespread across Ireland's midlands for millennia, but what makes this cluster unusual is its sheer density and the variety of construction methods preserved within a single stretch of bogland.

A field survey carried out by Gowen in 1999 documented the full range. Fifteen of the toghers were built from brushwood alone, the simplest technique, bundling branches together to create a firm enough surface underfoot. The remainder combined brushwood with roundwood, suggesting either greater ambition or the need to cross wetter ground. Three examples showed evidence of pegs or stakes, driven into the bog to hold the timbers in place and prevent them shifting under foot traffic or the slow pressure of the peat. Radiocarbon dating on one togher placed it firmly in the early medieval period, between AD 1024 and 1162, a time when this part of Tipperary would have seen monastic activity, cattle movements, and the ordinary commerce of rural life. Wood species identified across thirteen of the toghers included alder, ash, birch, elm, hazel, holly, and mountain ash, with ash and hazel appearing most frequently. That detail is telling: both species were abundant in managed Irish woodland of the period, and hazel in particular was traditionally coppiced, producing the straight, flexible rods that made ideal trackway material.

Derryville Bog, like many Irish raised bogs, has been subject to significant cutting over the decades, which is part of why these structures became visible and recordable at all. The anaerobic conditions within the peat preserve organic material with remarkable fidelity, meaning that wood laid down in the eleventh century can still show tool marks, species characteristics, and construction details that would vanish within years in open air. Visitors to the area should be aware that active or recently worked bogland can be unstable underfoot, and that the toghers themselves, where exposed, are fragile and protected.