The monument consists of a circular motte, its steep-sided platform measuring 41 metres across and rising between 4.5 and 5.5 metres high. A defensive ditch, or fosse, encircles the entire structure; it varies between 3 and 4 metres wide, though centuries of weathering have reduced its depth to less than a metre in places.

Two causeways cross the fosse, with the northwestern one particularly intriguing as it appears to be an original feature. This narrow causeway, just a metre wide, crosses the ditch at an angle before connecting to a ramp that leads up to the summit of the motte. About 28 metres south of the main structure, on the edge of a 15-metre drop to the river floor, sits a largely natural but level rectangular platform measuring roughly 25 by 16 metres. This secondary feature likely served as an outer bailey or additional defensive position associated with the main fortification.

The motte almost certainly relates to the Anglo-Norman borough of Donaghmore, which lay about 500 metres to the northeast. This connection places the earthwork within the broader context of Anglo-Norman colonisation in County Wicklow during the 12th and 13th centuries. The strategic positioning overlooking a river crossing point, combined with its proximity to a medieval borough, illustrates the dual military and administrative functions these fortifications served. The site has been recognised as a National Monument since 1940, ensuring its preservation as an important piece of Ireland’s medieval heritage.