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Latitude: 51.859 / 51°51'32"N
Longitude: -3.4112 / 3°24'40"W
OS Eastings: 302915
OS Northings: 218769
OS Grid: SO029187
Mapcode National: GBR YN.T2HP
Mapcode Global: VH6CB.TJJQ
Entry Name: Dam at the Upper Neuadd Reservoir
Listing Date: 28 July 2005
Last Amended: 28 July 2005
Source ID: 84824
Building Class: Water Supply and Drainage
Location: Situated in the Taf Fechan valley some 9.6 km SW of Llanfrynach.
Traditional County: Brecknockshire
Dam to Upper Neuadd reservoir opened 1902, designed by George F. Deacon engineer of London, assisted by T. F. Harvey, Borough Engineer Merthyr Tydfil. Holme & King contractors. Deacon was also engineer to the Liverpool Water Board and designed the tower at Lake Vyrnwy in the 1880s and that at Norton (Cheshire). The architecture at Vyrnwy is based on the Gothic of William Burges, here Deacon seems to have been influenced by the massive detail of the American architect H. H. Richardson.
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.
Graded II* for its special interest as an architecturally-designed dam of spectacularly massive construction and definite character.