Survey Data

Reg No




Categories of Special Interest

Architectural, Social, Technical

Original Use


In Use As



1785 - 1795


314802, 236393

Date Recorded


Date Updated



Double lock, constructed c.1790, as part of Royal Canal. Ashlar limestone chamber walls with gate recesses, cast-iron mooring rings and dressed limestone coping. Replacement timber and mild steel lock gates with timber balance beams. Walls of lower chamber slope up to middle gate. Recesses for stop gates to eastern end. Walls to east end expand to form canal harbour with dressed limestone walls. Remains of three-bay, single-storey lock keeper’s house with snecked limestone walls with dressed limestone quoins to north.


The chambers exhibit good quality stonework, with attractive sloping edges to cope with the change in height between the lower and higher levels, a testament to the skill of the craftsmen involved. One of a number of double-chambered locks on this stretch of the canal and part of a significant group of buildings including the lock keeper’s house and harbour, the railway siding and mill, which constitute an important reminder of the former industrial character of the area. The Royal Canal Company was established in 1789 to construct a canal to provide freight and passenger transport between Dublin and the River Shannon. Construction began with the laying of the first stone of the lock at Phibsborough (now the 5th lock) in 1790 and construction was completed to Ashtown by 1792.