Two woven basket structures, sitting in sloping estuarine clays roughly 60 metres north-north-east of Little Quay Island, are all that survives of a system designed to catch fish with nothing more than timber, wattle, and the rhythm of the tide. A fish weir of this kind works by guiding fish along a fixed alignment of posts into a narrowing enclosure from which they cannot easily escape once the tide drops; the woven baskets here served as that terminal trap.

Recorded in February 1997 and documented by Aidan O'Sullivan in 2001, the site consists of a post alignment running east to west for approximately 5.6 metres, leading toward two basket structures. The first, designated Bunratty 3A, is U-shaped, oriented west-north-west, and about 1.2 metres long. The second, Bunratty 3B, is funnel-shaped, similarly oriented, and considerably larger at 2.8 metres. O'Sullivan describes the whole arrangement as possibly medieval, which would place its use somewhere within a period when fish weirs on Irish tidal rivers were both legally contested and economically significant, frequently appearing in disputes between monasteries, lords, and the Crown over fishing rights on major waterways like the Shannon.