History in Structure

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Pont Nant-yr-ehedydd

A Grade II Listed Building in Mawddwy, Gwynedd

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Latitude: 52.7012 / 52°42'4"N

Longitude: -3.6247 / 3°37'29"W

OS Eastings: 290309

OS Northings: 312742

OS Grid: SH903127

Mapcode National: GBR 9C.2XY2

Mapcode Global: WH684.9C5J

Entry Name: Pont Nant-yr-ehedydd

Listing Date: 4 November 1999

Last Amended: 4 November 1999

Grade: II

Source: Cadw

Source ID: 22602

Building Class: Transport

Location: The bridge takes a hairpin bend of the A458 Mallwyd to Welshpool trunk road over the ravine of the Afon Clywedog, near its junction with the Afon Dugoed.

County: Gwynedd

Town: Machynlleth

Community: Mawddwy

Community: Mawddwy

Locality: Cwm Cewydd

Traditional County: Merionethshire

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The bridge was probably built in the mid C19 to carry the road on an even grade over the gorge of the river.


The bridge is built with local coursed shale and stone. The stilted semi-circular single arch is formed with flush even shale voussoirs rising to a keystone, flush spandrels and horizontal string, with a parapet. It spans approximately 6m, and carries a carriageway 5.5m wide with parapets of 50cm each side.

Reasons for Listing

Included as a typical well preserved bridge in a dramatic setting, part of the main road improvements that took place during the C19.

Other nearby listed buildings

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