The original Tang Bridge, recorded crossing the Tang River at Clogher, has left no visible trace above ground, absorbed into reclaimed land that gives nothing away about what once stood there. It is a place defined almost entirely by its own disappearance.

The bridge first appears on the Down Survey map of Abbeyshrule barony, dated 1655 to 1656. The Down Survey was a vast cartographic project directed by William Petty, producing the first detailed systematic maps of Irish land following the Cromwellian settlement, and the Tang Bridge features on the National Library copy as a crossing over the Tang River, which at that point marked the boundary with county Westmeath. The bridge is named again on the Ordnance Survey six-inch map of 1836, confirming it was still a recognised feature nearly two centuries later. At some point after that, the Tang River was diverted to a course roughly sixty metres to the south, a new bridge was built to serve the realigned channel, and the land between the two crossings was reclaimed. The earlier bridge was swallowed up in the process, and nothing of it remains on the surface today.

What survives is a cartographic ghost, traceable across several hundred years of mapping but no longer readable in the landscape itself. The gap between the old bridge's position and the current one is modest in physical terms, but the shift is enough to have erased one structure entirely while leaving the other carrying traffic as if nothing had changed.