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Cof Cymru: National Historic Assets of Wales · Wales

Pont Helygog

Brithdir and Llanfachreth, Gwynedd, Wales

A Grade II listed building in Helygog, Brithdir and Llanfachreth, Gwynedd, designated on 26 May 1995.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Pont Helygog, Brithdir and Llanfachreth, Gwynedd, 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
26 May 1995
Locality
Helygog
Community
Brithdir and Llanfachreth
Unitary authority
Gwynedd
Country
Wales
Coordinates
52.76066, -3.79308
Cadw reference
16043

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)
  • 1899 · 135 Harlech (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

Spanning the Nant Helygog about 3km E of Brithdir on the old course of the Roman road from Dolgellau to Bala (now a trackway).

Ancient single-span road bridge of various dates. The boulder-built foundations and piers of a much wider bridge than the present one survive beneath it and imply an early date since the road itself has reduced in width over the centuries. Whilst the earliest structure is impossible to date accurately it seems likely that the Nant Helygog was always bridged rather than forded here and it is not inconceivable that the bridge has a Roman or Medieval core. Called 'the old bridge' in 1830 when repairs to the parapets were carried out.

Rubble construction, the earlier irregular battered platform boulder-built on rock. Simple segmental arch and uncoped parapet walls; that to the R (S) is almost S-shaped in its irregularity; unmetalled carriageway.

A charming vernacular bridge traditionally said to have early origins.

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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