From Picture of Liverpool: Strangers Guide written in 1834
This was constructed by the late Duke of Bridgewater, for the purpose of loading and discharging flats belonging to him. It is supplied with an elegant and commodious range of warehouses, arched in the centre, so that vessels can be placed under the very rooms of the building, and by means of hatch-ways the cargoes are loaded and unloaded without being exposed to the weather. This dock belongs to the executors of the late Duke of Bridgewater