A fulacht fia, the term used for these Bronze Age cooking or processing sites, typically consists of a horseshoe-shaped mound of heat-shattered stone accumulated beside a water source and a trough, usually a pit lined with wood or stone into which water was poured and heated by dropping in fire-cracked rocks. Monroe fits the pattern, but with enough complexity to suggest repeated and organised use across time.

The site only came to light during testing carried out in January 2017 ahead of construction work on the M11 Gorey to Enniscorthy motorway. Excavation followed in November of the same year. What emerged was a rough mound roughly 13 metres north to south and 4 metres wide, composed of six spreads of broken and burnt stone. Beneath it lay two subrectangular pits filled with silts and heat-shattered stones, likely functioning as troughs. Four further pits beneath the mound were packed with gravelly or sandy silts and burnt stone, and smaller pits had been cut from within the body of the mound itself, suggesting the site was added to and reworked over time. To the west of the main mound sat a large rectangular trough, nearly two and a half metres long and almost two metres wide, with a wooden base of which four planks survived. A slight V-shaped channel ran from this trough north-eastward through the mound, presumably directing water. Around twenty metres to the south-west, a subcircular pit containing sandy silts and brushwood fragments may have been a further trough. The whole area sat at the headwaters of a small stream, on a south-east-facing slope beside what appears to have been an ancient watercourse, its channel still traceable as a depression filled with alluvial deposits. Few artefacts were recovered, which is typical of fulacht fia sites, where the evidence tends to be structural rather than portable.