The arc, roughly five metres across east to west, may be the surviving northern half of a circular booley hut, a type of simple seasonal shelter used by those who practised transhumance, the old Irish custom of moving livestock to higher grazing ground in summer. The word "booley" derives from the Irish "buaile", referring to a milking place or summer pasture, and the huts built there were rarely substantial, which is part of why so little of them tends to survive.

The remains at Cregganroe are described as exiguous, meaning there is very little left, and the identification as a booley hut rather than a small enclosure or some other structure remains tentative. What makes the site more interesting than its modest stonework might suggest is its context. It sits on a terrace overlooking a stretch of boggy ground to the north, with the ground falling gently eastward toward a stream. Ten metres to the north lies a possible enclosure, and fifty metres to the south stands another booley hut. Together these features are associated with a wider field system and a cluster of at least ten booley huts in the immediate area, suggesting this ridge saw sustained seasonal use over time, with families or groups returning year after year to the same upland ground to tend their cattle through the summer months.