Dam at the Upper Neuadd Reservoir

Long dam of massive rock-faced squared blocks with tooled edges. Long straight dam with sloping face and quarter-round moulded stone coping, each side of centre spillway-dam flanked by two towers. Spillway is bridged by walkway on seven stone piers rising from the sloping face of the very high rock-faced stone main dam, the face curving out at base to a more gentle slope. This is flanked by raised sections to similar slope which carry the two towers. The W tower is much larger, square-plan, with banded rusticated angle piers, modillion cornice broken forward around piers, and tapered square finials at each corner, around stone spire. The S front has a large 3-light mullioned window with arched head, stone voussoirs, sandstone mullions and massive cast-iron glazing bars. W and E sides have low doors protected by stone balconies on the S. W tower is much shorter, square neo-classical building with the same banded rusticated angle piers, modillion cornice, but heavy blocking course above gabled to S. Low S lunette window with stone voussoirs and cast-iron glazing bars. Door each side with stone balcony on S. Extending from the base of the E side of the dam, below the main tower is a massively designed tunnel-outlet in Piranesi style, the arch framed in gargantuan rustication, the W side tapered, and the corbelled parapet with low centre gable over bronze plaque recording the completion of the dam in 1902. Brick tunnel lining. A platform in front of the tunnel covers an arched water outlet on the W side.