A togher is a bog road, typically a causeway of timber laid across wet ground to allow passage where none would otherwise be possible, and Cooleeny townland contains an extraordinary concentration of them. Field survey identified 44 in total, ranging from confirmed examples to probable ones, all threading through the same stretch of bog.

The majority of these toghers were built using a combination of brushwood and roundwood timbers, though the builders were clearly adaptable: six relied on roundwood alone, eight on brushwood alone, and one unusual example incorporated brushwood and gravel together. When researchers were able to identify the wood species used across seventeen of the toghers, the range was striking. Alder, ash, birch, blackthorn, hazel, mountain ash, and willow all appear, suggesting that builders were selecting from whatever locally available timber suited the task rather than following a strict template. Two of the toghers have been radiocarbon dated, both returning Iron Age results: one to 388 to 207 BC, the other to 372 to 192 BC. These are not rough estimates but overlapping ranges that place the construction of at least some of this network firmly within the middle centuries of the first millennium BC, when communities were regularly crossing and working this landscape in ways that left timber preserved in peat for over two millennia.