Victoria Locks, Fathom Road, Newry, Co Armagh

Victoria Locks is the largest single lock chamber in Northern Ireland. Located at Upper Fathom on Fathom Road in Newry, it reflects the former importance of maritime trade to the town and is associated with the renowned engineer Sir John Rennie.

The lock was constructed between 1842 and 1850 as part of an extension to the Newry ship canal. The Newry Navigation Company commissioned Rennie to address recurrent problems affecting the original sea lock at Lower Fathom by extending the canal approximately 2.5 kilometres and constructing a new lock at Doyle's Hole. The scheme also involved deepening the original ship canal and the riverbed above Warrenpoint. Although originally planned as two separate locks, only one was built.

The substantial single chamber measures 58.5 metres between the gate emplacements and 15.25 metres wide (192 feet by 50 feet), though the original specification was 67 metres by 15.2 metres (220 feet by 50 feet). The walls are constructed of vee-jointed ashlar limestone sourced from Carlingford, with gate emplacements faced in granite ashlar. Halfway between the upper and lower gate emplacements is an identical third emplacement set into both walls, as though for a third set of gates, though these were never installed.

Access within the chamber is provided by two vertical metal ladders on the east wall and a masonry stairway positioned just above the upper gates on the opposite side. Depth indicators, calibrated in feet and six-inch divisions, are incised into the stonework at three points along the east wall. Timber and granite bollards line both edges of the chamber, with a modern chainlink fence along the west side.

Both sets of lock gates are slightly bulbous and hollow, sheeted with riveted metal, as are the wall emplacements. The footboards across the tops of the gates have chainlink fencing along their outer edges. The lower set of gates incorporates two hand-operated vertical sluices in each leaf. Both sets are operated by steel cables attached to hand-operated winches protected by metal covers.

The lock incorporates several water control features. Just below the upper gates on the seaward side are four vertical sluice gates set into the bank, probably used to fill the chamber more rapidly and reduce delay for vessels. Drainage culverts on each wall towards the bottom of the chamber, installed in the early 1950s, work in conjunction with the sluices in the lower gates to drain the chamber rapidly. The gate controlling the landward-side culvert is visible just below these gates and discharged beneath the concrete wharf to the south of the lock.

An underground bypass channel on the landward side, associated with an early twentieth-century pump house (now demolished), raised water from the river to the canal during periods of shortage. This is visible as a culvert above the water line immediately northwest of the upper gates, with a hand-operated winch directly above it functionally connected to the system. A concrete sluice emplacement with three counterweighted vertical concrete gates stands just above the upper gates on the seaward side, connected to a single concrete sluice emplacement on the sea wall of the embankment halfway down the lock chamber, probably used to drain the canal.

A metal post at the northwest end of the complex probably once displayed a signal, raised and lowered by a rack and pinion mechanism, to indicate the water level in the chamber to approaching vessels. Old photographs show a second standard on the seaward side, now removed.

The embankment facing the river is constructed of ashlar limestone, rounded at its south end, with stone steps descending to the tidal Newry River. The canal bank immediately northwest of the upper gates is pitched with stone to form a small quay and boat waiting area, with mooring posts along its edge.

The original timber gates were replaced with metal-sheeted gates during the canal's refurbishment in the early 1930s. The filling sluices and canal drainage sluices may also have been installed at this time. The area west of the chamber has been paved and tarmacked to form a public amenity and carpark, separated from the road by a timber fence and rendered wall at the entrance.

At the south end of the lock on the landward approach are the substantial remains of a piled reinforced-concrete quay with two associated metal bollards. The quay was designed by Ferguson and McIlveen and erected by P J Walls & Bros Ltd in 1953; working drawings indicate dimensions of 186 feet long by 37 feet 2 inches wide. The construction of two sluicing culverts formed part of this contract. Nearby stand the derelict remains of a metal barge.

The ship canal was abandoned in the 1970s. However, the locks were refurbished in the 1990s by Newry & Mourne District Council for use by pleasure craft. No trace remains of the former water pumping station, erected around 1905 by the Newry Port & Harbour Trust on the landward side of the lock chamber, or of the former lock keeper's house.