The best-preserved of the group is a compact oval structure, measuring roughly 2.6 metres along its north-east to south-west axis and 1.9 metres across, its walls built in drystone, a technique requiring no mortar, just careful selection and stacking of stone. Those walls survive to about 0.8 metres in height and are partially grass-covered now, blurring into the rough hill pasture around them. A narrow entrance, around half a metre wide, once opened to the north-west, though it has since collapsed.

The three hut sites cluster tightly: two of the others lie approximately 5 metres and 30 metres to the south-west respectively, and roughly 50 metres to the west sits a rath, a type of enclosed farmstead common in early medieval Ireland, typically consisting of a circular area bounded by one or more earthen banks and ditches. The proximity of the rath to these small structures is suggestive. Hut sites of this kind are often interpreted as seasonal shelters associated with transhumance, the practice of moving livestock to upland pastures in summer, or as ancillary buildings tied to a nearby farmstead. Whether these served the occupants of the rath, or belonged to an earlier or later phase of activity on the hillside, is not recorded. What survives at Coolnagoppoge is simply a tight grouping of small enclosures in rough pasture, their drystone walls slowly subsiding back into the slope, overlooking a river valley that has probably looked much the same for centuries.