No marker indicates where it stood. No masonry survives above water, at least none that has been conclusively identified. What remains is the record of its existence, a quiet entry in the historical sources that confirms something was here, working the tidal margins, sometime in the fourteenth century.

A fish weir, in its simplest form, was a structure built into a river, estuary, or coastal inlet to trap fish as the tide receded, typically constructed from timber stakes, wattle, or stone arranged in a V-shape or enclosure to funnel the catch. The Bullock weir or fishery is noted by O'Flanagan, writing in 1941 to 1942, in connection with the castle at Bullock, a coastal fortification whose origins lie in the medieval period. The association between the two suggests the fishery was likely a commercial or provisioning operation tied to whoever controlled the castle at the time, rather than a small domestic arrangement. Bullock itself, now part of the Dalkey area, had genuine strategic and economic significance in the medieval period as a harbour used for landing goods, including wine imports, destined for Dublin. A productive fishery in that context would have been a useful asset.

Because the site has not been precisely located, there is no specific point to visit and identify as the weir. The Bullock area is accessible on foot from Dalkey or Sandycove, and the small harbour at Bullock remains a working feature of the coastline. For anyone drawn to the idea of medieval infrastructure hiding in plain sight, the harbour walls and rocky foreshore are worth a slow look at low tide, when the sea pulls back and the older geometry of the coast becomes briefly legible. Whether any feature there represents the remnant of the medieval fishery is an open question, which is, in its own way, part of the interest.