A field survey identified 44 toghers, or bog roads, within Cooleeny townland alone. A togher is essentially a trackway laid across soft or waterlogged ground, typically constructed from timber, allowing people and animals to cross terrain that would otherwise be impassable. What makes Cooleeny unusual is sheer density: 44 examples in a single townland, representing a sustained and repeated human effort to move through this bog over an extended period.

The survey, carried out by Gowen in 1999, found that most of these toghers were built using a combination of brushwood and roundwood laid together to distribute weight across the boggy surface, though six relied on roundwood alone and eight on brushwood alone. One example, catalogued as TN036-050095, was constructed from brushwood and gravel, an uncommon variation. Radiocarbon dating was possible on two of the toghers, and both returned Iron Age dates: one spanning roughly 388 to 207 BC, the other 372 to 192 BC. These dates place the trackways in a period when Ireland's bog landscapes were being actively navigated, and the variety of timber species identified across seventeen of the toghers gives a sense of the range of woodland being drawn on locally. Alder, ash, birch, blackthorn, hazel, mountain ash, and willow were all recorded, suggesting that builders were working opportunistically with whatever suitable wood was at hand rather than selecting a single preferred material.