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Llanddetti Bridge (Canal Bridge No.139)

A Grade II Listed Building in Talybont-on-Usk, Powys

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Latitude: 51.8762 / 51°52'34"N

Longitude: -3.2732 / 3°16'23"W

OS Eastings: 312447

OS Northings: 220498

OS Grid: SO124204

Mapcode National: GBR YV.RSVZ

Mapcode Global: VH6CF.63YK

Entry Name: Llanddetti Bridge (Canal Bridge No.139)

Listing Date: 17 December 1998

Last Amended: 17 December 1998

Grade: II

Source: Cadw

Source ID: 21111

Building Class: Transport

Location: W of B4558, close to Llanddetty Hall Farm.

County: Powys

Community: Talybont-on-Usk (Tal-y-bont ar Wysg)

Community: Talybont-on-Usk

Locality: Llanddetti

Traditional County: Brecknockshire

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The Brecknock and Abergavenny Canal was promoted in 1792 to connect the upper Usk valley with the Monmouthshire Canal at Pontymoile and from there to the sea at Newport. First section, between Gilwern and Talybont, was cut between 1797 and 1799, with upper section between Talybont and Brecon opened in 1800, both sections engineered by Thomas Dadford. Lower section between Gilwern and Pontymoile completed 1812 and engineered by William Crosley. Linked to tramroads, the canal was an important artery for trade in iron, lime and coal. In 1865 the Brecknock and Abergavenny and the Monmouthshire Canals merged to become the Monmouthshire and Brecon Canal, which was later incorporated into the Great Western Railway. Many bridges had large cast iron weight restriction notices on poles erected at each end. Last toll was taken in 1933. Restoration of canal began 1964.


Hump-back bridge of rubble sandstone. Segmental arch has thin voussoirs and low parapet with flat coping. The abutments curve outwards on both sides and the parapet has square end piers. On the E side is a cast iron plaque with the bridge number cast in relief in keystone position. The towpath passes under bridge on N side and has a stone kerb; on S side is a stringcourse roughly at water level.

Deck surface is a grass and concrete farm track. Two lozenge-shaped cast iron weight restriction notices.

Reasons for Listing

One of a group of original Brecknock and Abergavenny Canal bridges.

Other nearby listed buildings

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