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Bridge 145 over the Montgomeryshire Canal

A Grade II Listed Building in Llandyssil, Powys

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Latitude: 52.5515 / 52°33'5"N

Longitude: -3.2352 / 3°14'6"W

OS Eastings: 316341

OS Northings: 295564

OS Grid: SO163955

Mapcode National: GBR 9W.DB58

Mapcode Global: VH684.W40C

Entry Name: Bridge 145 over the Montgomeryshire Canal

Listing Date: 14 July 1997

Last Amended: 14 July 1997

Grade: II

Source: Cadw

Source ID: 18530

Building Class: Transport

Location: The bridge carries a trackway over the canal and is located to the N of bridge 146 and Brynderwen Lock. It is immediately E of the A483 Welshpool to Newtown road.

County: Powys

Community: Llandyssil (Llandysul)

Community: Llandyssil

Locality: Brynderwen

Traditional County: Montgomeryshire

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One of a group of ‘fish-bellied’ iron bridges probably designed and constructed by George Buck, engineer of the Montgomeryshire Canal. He was engineer of the Western branch in 1832-3, and bridges of this type were built over a considerable period of time up to c1850. It has been suggested that this may be the only one to retain the original girder positions.


Cast iron ‘fish-bellied’ beam bridge. There are 5 original beams supporting a replacment deck of concrete with a plywood soffit The parapets consist of timber posts, at the ends and in the centre, and 3 rows of iron rails. These continue to the W and are splayed. The iron beams sit on sandstone padstones, probably rebuilt, on brick abutments. The abutments have chamfered blue brick copings and are splayed to the E where the towpath is located. To the W the abutments are straight, with curved buttresses running outwards and terminating with piers.

Reasons for Listing

Listed as one of a small group of ‘fish-bellied’ iron bridges over the Montgomeryshire Canal. These bridges represent the early use of girders of this characteristic shape, designed to compensate for the low tensile strength of cast iron.

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