It is a V-shaped wooden trap, the kind of structure that would have been wholly unremarkable to anyone living along this estuary in the medieval period, but which survives here as a rare physical remnant of the everyday labour of catching fish.

The weir was documented by Aidan O'Sullivan in 2001, who described it as a flood weir constructed from two converging post-and-wattle fences. Post-and-wattle construction involves driving upright timber posts into the ground and weaving flexible branches or rods between them, much like a fence or hurdle; in the context of a fish trap, this creates a permeable barrier that water can pass through but fish cannot easily escape. The two fences converge toward a point, with the longer shore fence measuring twenty-six metres and the shorter flood fence measuring four and a half metres. The orientation as a flood weir means it was designed to trap fish as the tide came in rather than as it receded. A single vertical post recovered from the larger fence was radiocarbon dated, placing the construction of the trap somewhere between the mid-eleventh and early thirteenth century, a period spanning the late Irish-Scandinavian era through to the early decades of the Anglo-Norman settlement of Munster.

The site sits in the tidal mudflats of the Deel estuary, which means access depends heavily on tide times and underfoot conditions. The estuarine clay in which the structure is preserved is precisely what has protected the organic timber over centuries, but it also makes the immediate area difficult to approach. There is little to see above the surface in the conventional sense; what survives is largely below or at ground level, embedded in the foreshore sediment. Anyone with a particular interest in early medieval fishing technology or wetland archaeology would want to consult O'Sullivan's 2001 publication, which provides the detailed site drawings and contextual analysis that a visit alone cannot supply.