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Cof Cymru: National Historic Assets of Wales · Wales

Pont Glyn-diffwys

Llangwm, Conwy, Wales

A Grade II listed building in Ty-nant, Llangwm, Conwy, designated on 1 April 1998.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Pont Glyn-diffwys, Llangwm, Conwy, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Listed building, Grade II
Broad class
Transport
Date of designation
1 April 1998
Locality
Ty-nant
Community
Llangwm
Unitary authority
Conwy
Country
Wales
Coordinates
52.98692, -3.50370
Cadw reference
19583

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1795 map "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).

Historical maps covering this location

  • 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
  • 1830 · V.3:11-15:XV. Britisches Reich. A. Kon: England. b. Frstenthum Wales: Shire: 37-40 (David Rumsey Map Collection, Stanford Libraries)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1898 · 120 Corwen (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)

Get directions ↗

This record in Cadw's own full report ↗

Cadw's description

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.

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.

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.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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