Garndiffaith Viaduct

The Garndiffaith Viaduct stretches 185 yards across the Afon Lwyd river valley with nine spans of 50 feet each, constructed from squared rubble and brick arches.

Built between 1876 and 1877 by engineer John Gardner, this viaduct connected the Monmouthshire Railway and Canal Company with the London and North Western Railway networks.

The viaduct exemplifies Victorian railway engineering and stands as a testament to the industrial development that transformed the Welsh valleys in the 19th century.

The structure now forms part of National Cycle Network Route 46, offering cyclists and pedestrians a path across the valley while preserving its Grade II listed status.

The viaduct's deck width increases from 26 feet at span 4 to 51 feet at the abutment, with a distinctive southern curve of 14 chains radius.

GPS coordinates: 51.73270,-3.06870

Latest update: March 3, 2025 22:46