There, on the northern bank of the Shannon estuary, the remains of a post-medieval fish weir sit quietly in the intertidal mud, a structure whose purpose was entirely practical and whose form has changed little in concept since people first began trapping fish in tidal channels.

The weir has been classified as a creek trap, a type of fish weir that works by exploiting the movement of tidal water through a narrow channel. As the tide recedes, fish are guided or held by the arrangement of stakes and angled supports, making collection relatively straightforward. This particular example consists of post alignments oriented north-east to south-west, roughly nine metres in length, with obliquely set braces, the angled timbers that would have directed fish into the trap rather than allowing them to escape back with the flow. The structure sits approximately sixty metres north-west of a related site recorded nearby. O'Sullivan, writing in 2001, places it within the post-medieval period, suggesting it was in use sometime after the sixteenth century, when the Shannon estuary would have been a working waterway supplying both local households and wider trade networks with fish.