Tower, Summit of Slieve Commedagh, Mourne Mountains, Newcastle, Co Down

This granite tower, erected between 1920 and 1939, serves as a shelter on the Mourne Wall, which defines the catchment area for the Belfast City & District Water Commissioners’ Silent Valley Reservoir. The wall itself was constructed between 1904 and 1922. The tower is one of three similar structures on the Mourne Wall, the others located on Meelmore and Donard.

The tower is tapered and measures 3.05 meters square at its base, rising 3.50 meters from a projecting foundation course to the top of the projecting coping of finely dressed granite blocks. A two-step pyramidal cap, also of finely dressed granite, tops the structure. The external face is constructed of squared rubble laid in courses, while the internal face is of random rubble. Quoins have tooled edges and raised quarry-dressed faces, and the external joints are strap pointed.

On the east wall, two granite steps lead to a 0.60-meter wide by 1.55-meter high opening that provides access to the internal chamber. The jambs are of finely dressed granite blocks with tooled edges, and the lintel is of similar material, featuring a stop-chamfered spine beam with run-out stops and the date "1913" inscribed on the external face. Cast-iron plaques, reading "Belfast Water Works Trespassers Prosecuted," are affixed at the top right of the north and east walls. A small quarry, likely the source of the tower’s construction materials, is situated immediately south of the tower. The tower is abutted at its east and west sides by the Mourne Wall. The structure, while a modest shelter, possesses architectural quality enhanced by its mountaintop setting and is considered an integral part of the wall, which is associated with the Belfast Water Commissioners' scheme. It functions as a refuge for walkers and is of notable industrial archaeological interest.