It has never been excavated, carries no interpretive signage, and owes its entire presence in the archaeological record to a single aerial photograph. That photograph, taken as part of the Bruff Survey and catalogued as AP 4/3658, revealed the faint but legible outline of a ditched enclosure that ground-level observation alone would almost certainly miss.

The site was formally described by Doody in 2008 as a subcircular ditched enclosure with an internal bank that appears to be platformed, meaning the interior may have been deliberately levelled or raised to create a flat working surface within the earthwork. That combination of features, a surrounding ditch, an internal bank, and possible internal platform, points archaeologists towards a Bronze Age origin, a period stretching roughly from 2500 to 500 BC when such enclosed settlements and ceremonial sites were laid out across the Irish landscape. The classification remains tentative; morphology, the overall shape and structure of an earthwork, can suggest a date and function, but without excavation it cannot confirm one. The record was compiled by Denis Power and uploaded to the database in November 2013, which gives a sense of how recently even a site of probable prehistoric origin can enter formal documentation.

Knockcorragh sits in County Limerick's Bruff area, a part of the county that repays slow attention; the surrounding farmland is quietly dense with earthwork survivals that register more clearly from the air than from the road. Anyone visiting should be aware that this enclosure is not a managed heritage site and access would depend entirely on landowner permission. The feature itself is likely to appear as a low, grass-covered rise with subtly uneven ground rather than anything dramatically visible. Early morning light, which throws shallow earthworks into relief by casting long shadows across slight changes in elevation, gives the best chance of reading the outline in the field.