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Latitude: 51.7958 / 51°47'45"N
Longitude: -3.4442 / 3°26'39"W
OS Eastings: 300497
OS Northings: 211785
OS Grid: SO004117
Mapcode National: GBR YM.Y092
Mapcode Global: VH6CQ.8404
Plus Code: 9C3RQHW4+88
Entry Name: Bridge over Nant Aber-nant stream
Listing Date: 29 July 2009
Last Amended: 29 July 2009
Grade: II
Source: Cadw
Source ID: 87589
Building Class: Transport
ID on this website: 300087589
Location: Carries the minor road which runs along the W side of Llwyn-on Reservoir over Nant Aber-nant stream
County: Rhondda Cynon Taff
Community: Hirwaun
Community: Hirwaun
Locality: Llwyn-on Reservoir
Traditional County: Brecknockshire
Tagged with: Bridge Road bridge
Built as part of the work for the construction of Llwyn-on Reservoir, part of the water-supply system for Cardiff designed at the end of the nineteenth century. Llwyn-on Reservoir was the last of the four reservoirs comprising the scheme to be built, and detailed design work was carried out by Charles H Priestley, on a bigger scale than envisaged in the original scheme. It was begun in 1912, but work was delayed after the outbreak of war in 1914, and it was not completed until 1926.
Wide segmentally arched bridge with parapets to either side of roadway. Bold rock-faced masonry, the parapets have terminal piers with heavy copings, rock-faced with tooled margins; similar piers flank the arch, which has rock-faced voussoirs. Continuous string-course below parapet.
Listed as a fine masonry bridge with high-quality detailing, and as an integral part of the works associated with the construction of Llwyn-on Reservoir, an exceptionally well-preserved major Welsh civic engineering scheme.
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