Ancient Monuments

History on the Ground

This site is entirely user-supported. See how you can help.

Pontrhydyfen Aqueduct / Viaduct

A Scheduled Monument in Cwmavon (Cwmafan), Neath Port Talbot (Castell-nedd Port Talbot)

More Photos »
Approximate Location Map
Large Map »

If Google Street View is available, the image is from the best available vantage point looking, if possible, towards the location of the monument. Where it is not available, the satellite view is shown instead.


Latitude: 51.633 / 51°37'58"N

Longitude: -3.7414 / 3°44'29"W

OS Eastings: 279571

OS Northings: 194127

OS Grid: SS795941

Mapcode National: GBR H5.89MF

Mapcode Global: VH5GW.36DY

Entry Name: Pontrhydyfen Aqueduct / Viaduct

Scheduled Date: 7 December 1978

Source: Cadw

Source ID: 616

Cadw Legacy ID: GM393

Schedule Class: Water Supply and Drainage

Category: Aqueduct

Period: Post Medieval/Modern

County: Neath Port Talbot (Castell-nedd Port Talbot)

Community: Cwmavon (Cwmafan)

Built-Up Area: Pontrhydyfen

Traditional County: Glamorgan


The monument consists of the remains of an aqueduct, dating to the early 19th century. Pontrhydyfen was originally constructed as a viaduct which carried a tramroad. It was the largest tramroad viaduct in Britain when built. Later on, it became an aqueduct for carrying water across the valley. It is c. 70m in length and comprises four round headed arches, whose piers are splayed rectangular in section.

The monument is of national importance for its potential to enhance our knowledge of early 19th century industrial engineering and technology. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structure itself may be expected to contain archaeological information concerning chronology and building techniques, together with a strong probability of environmental evidence. Aqueducts may be part of a larger cluster of monuments and their importance can further enhanced by their group value.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

Other nearby scheduled monuments is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact for any queries related to any individual ancient or schedued monument, planning permission related to scheduled monuments or the scheduling process itself. is a Good Stuff website.