It appears on Ordnance Survey maps from 1842 and again in 1897, a circular enclosure marked with the quiet authority of a feature that had presumably sat in the landscape for a thousand years or more. Today, there is nothing to see. The site has been completely levelled, and the ground gives no hint that anything was ever there.

A rath, to use the Irish term, is a type of enclosed farmstead typical of early medieval Ireland, usually defined by one or more earthen banks and ditches and associated with a single family or small farming community. What made the Lerrig example of particular interest was the souterrain it reportedly contained. Souterrains are underground stone-lined passages or chambers, constructed during the early medieval period and associated with storage, refuge, or both. The landowner described it as a fine example, which suggests it was substantial enough to leave an impression. Whether it survived the levelling of the enclosure above it, or was likewise destroyed, is not recorded. The rath itself was clearly still legible as a landscape feature through the late nineteenth century, captured in two separate mapping surveys, but at some point between those recordings and the present, it was erased.