A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically consisting of a raised circular platform ringed by an earthen bank and an outer ditch, known as a fosse. At Crean, much of that arrangement has been worn or ploughed away, and the entrance has become completely unreadable, yet the remnant still carries a quiet legibility across the low Limerick farmland around it.

When O'Kelly recorded the site in 1942 to 1943, the picture was already one of significant loss. The north side of the monument had been obliterated entirely, and only around thirty feet of the original bank survived, on the west side. The outer fosse, which would once have encircled the whole enclosure, could still be traced. The overall diameter of the platform measured approximately 175 feet, or 53 metres, placing it comfortably within the range of a substantial rath. O'Kelly also noted that it sits on good lowland, the kind of fertile ground that early medieval farming communities actively sought out, which goes some way to explaining both why someone settled here and why later agricultural activity gradually consumed so much of the earthwork.

Aerial photographs held by the Archaeological Survey of Ireland, taken in September 2002 under reference ASIAP 307/24, 26, and 32, offer a clearer sense of the monument's overall shape than is possible on the ground, where the surviving earthworks are modest and the missing sections leave little to guide the eye. Visitors approaching on foot should look for the subtle change in ground level that marks the platform edge and, on the west, the low remnant of the bank. The surrounding pasture is the kind of unassuming landscape that repays slow walking rather than a quick glance from the road.