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Cof Cymru: National Historic Assets of Wales · Wales

Glasinfryn Viaduct (partly in Llandygai community)

Pentir, Gwynedd, Wales

The record

Designation
Listed building, Grade II
Broad class
Transport
Date of designation
22 September 1997
Locality
Glasinfryn
Town
Bangor
Community
Pentir
Unitary authority
Gwynedd
Country
Wales
Coordinates
53.20005, -4.11663
Cadw reference
18915

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

David Rumsey Map Collection, Stanford Libraries

Shown on 5 historical map sheets, the earliest the 1896 "Sheet 7. Ordnance Survey of England and Wales." (David Rumsey Map Collection, Stanford Libraries).

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This record in Cadw's own full report ↗

Cadw's description

The viaduct lies approximately 100m E of the N end of the village of Glasinfryn.

Built c1880 to carry the former Bangor to Bethesda Branch of the London and North-Western Railway across the deep valley of the Afon Cegin. It is now a footpath.

The viaduct is of rock-faced coursed stone, and is laid out on a very distinct curve extending for some 120m. It consists of eight arches with a broad central semi-eliptical skewed arch having 5-ring dry-toothed blue brick voussoirs. The central arch is flanked by narrower semi-circular straight arches, four on one side and three on the other. A margin-dressed rock faced string course forms the base of a similar parapet of 5 courses, coped with hog-backed stone.

Included as a fine example of railway engineering, of special interest as laid out on a curve.

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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