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Pont Glyn-diffwys

A Grade II Listed Building in Llangwm, Conwy

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Latitude: 52.9869 / 52°59'12"N

Longitude: -3.5037 / 3°30'13"W

OS Eastings: 299153

OS Northings: 344345

OS Grid: SH991443

Mapcode National: GBR 6J.HTMT

Mapcode Global: WH66V.45VZ

Entry Name: Pont Glyn-diffwys

Listing Date: 1 April 1998

Last Amended: 1 April 1998

Grade: II

Source: Cadw

Source ID: 19583

Building Class: Transport

Location: The bridge is located W of Dinmael, and carries the road from the junction with the Holyhead Road over the Afon Ceirw, to Cwm Main and beyond.

County: Conwy

Community: Llangwm

Community: Llangwm

Locality: Ty-nant

Traditional County: Denbighshire

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Built in the C18, probably before 1794 when the crown was raised by 15in (38cm) and partly rebuilt by Thomas Penson, surveyor, to carry a minor road over the Penybont ravine and falls. The bridge was apparently known to George Borrow as Glyn Bin.


Built of local rubble stone. A single segmental arch spanning approximately 11m between rock abutments, the soffit rising to c18.0m above water level. The arch is formed of 50cm deep rubble voussoirs slightly set in under a projecting regulating course, above which flush spandrels extend up into a flush stone-coped parapet, now provided with safety wires. The width of the bridge between parallel sides is 5.6m, providing a 4.7m width level carriageway between the parapets, which splay slightly outwards at the ends to terminate in square piers.

Reasons for Listing

Included as a fine and little altered country bridge dramatically spanning the ravine containing the Penybont falls. Of group value with the adjoining listed section of the Holyhead Road.

Other nearby listed buildings

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