One small structure, however, lingers in the historical record as a telling reminder of how the river once functioned as a commercial artery: a crane house known as the Butter Crane, which stood on Usher's Quay sometime in the mid-eighteenth century. A crane house, for those unfamiliar with the term, was essentially a covered housing for the mechanical hoisting equipment used to load and unload cargo from vessels moored alongside a quay, protecting the mechanism from weather and allowing the work of the port to continue regardless of conditions.

The name alone tells a small economic story. Butter was one of Ireland's most significant export commodities throughout the eighteenth century, and the quays of Dublin were busy with the movement of casks and barrels destined for British and Continental markets. Usher's Quay, on the south bank of the Liffey west of the old city core, would have seen considerable traffic of this kind. The historian John De Courcey, writing in 1996, records the presence of this Butter Crane specifically at that location, placing it within the mid-eighteenth century period when Dublin's port infrastructure was being steadily expanded and formalised to handle the growing volume of trade passing through the city.

Nothing of the crane house itself survives above ground today, and Usher's Quay is now a busy through-road carrying traffic westward out of the city centre. The site is worth visiting less as a destination in the conventional sense and more as an exercise in reading an urban landscape against its own history. Standing at the quayside and looking toward the river, the width of the Liffey and the surviving quay walls offer some physical continuity with the scene De Courcey describes. The area is easily reached on foot from the Four Courts, a short walk eastward along the north bank and across any of the nearby bridges. For those interested in Dublin's mercantile past, the nearby Church Street and Smithfield quarter add further texture to what was once a densely commercial part of the city.