A fish weir of this type works by guiding fish into a trap as the tide recedes, using fences of woven wattle, that is, interlaced branches or rods, to funnel and hold a catch. Most of the wattlework here has long since collapsed, but eighteen posts survive, ranging from three to ten centimetres in diameter and still standing up to twenty-seven centimetres proud of the sediment, oriented broadly northeast to southwest.

The feature came to light not through ground-level excavation but through an aerial drone survey of Wexford Harbour, catalogued as survey 19D0034, which picked out numerous intertidal features that would be difficult or impossible to spot from the shore. Archaeologists subsequently visited the site at a low spring tide to inspect the posts directly, confirming the presence of the weir and the scattered remains of its wattle panels. The work was published by Bangerter in 2019. Fish weirs of this construction, post-and-wattle structures built in tidal zones, were used along Irish coasts and estuaries for centuries, and their survival depends heavily on waterlogged conditions that slow the decay of organic material. The Wexford example is a quiet illustration of how much of that everyday, practical past still lies just beneath the tideline, neither dramatically buried nor easily visible.