A watercourse running broadly north to south, its western edge held in place by a clay bank, carried flow that was eventually disciplined into something more deliberate: a stone-lined millrace, the kind of engineered channel used to direct water onto a mill wheel with enough force to grind grain or power other machinery. That such infrastructure existed here is not surprising in itself, but the physical evidence of it, preserved underground and recoverable by excavation, offers a rare, grounded glimpse into the working landscape of medieval Dublin.

The watercourse came to light in 1994, during archaeological excavations recorded under the reference 94E 160. The exposed section revealed not only the natural channel but also evidence of deliberate human modification. The stone-lined millrace associated with it has been dated to the 13th or 14th century, a period when Dublin was an expanding Anglo-Norman urban centre with significant demands for milled grain. Millraces of this type, channels lined with carefully laid stone to prevent erosion and maintain a consistent flow, were a standard piece of medieval engineering, and their presence typically indicates a working mill somewhere downstream. The clay bank on the western side of the channel suggests early efforts to manage and contain the water, perhaps predating the more formal stone construction.

There is nothing to see at ground level today; the site exists as an archival and archaeological record rather than a visible monument. Anyone with a serious interest in Dublin's medieval waterways would do well to consult the excavation report through the National Monuments Service or the Irish Excavations database, where the 94E 160 record is held. The broader north city area repays this kind of documentary exploration, since the medieval topography of Dublin, shaped heavily by its rivers and managed watercourses, is largely invisible to the casual eye but well documented through decades of urban excavation.