Full Report for Listed Buildings
The list description is not intended to be a complete inventory of what is listed: it is principally intended to aid identification. By law, the definition of a listed building includes the entire building (i) and any structure or object that is fixed to the said building and ancillary to it and (ii) any other structure or object that forms part of the land and has done so since before 1 July 1948, and was within the curtilage of the building, and ancillary to it, on the date on which said building was first included in the list, or on 1 January 1969, whichever was later.
Summary Description
Reference Number
21111
Building Number
Grade
II
Status
Designated
Date of Designation
17/12/1998
Date of Amendment
17/12/1998
Name of Property
Llanddetti Bridge (Canal Bridge No.139)
Address
Location
Unitary Authority
Powys
Community
Talybont-on-Usk
Town
Locality
Llanddetti
Easting
312447
Northing
220498
Street Side
Location
W of B4558, close to Llanddetty Hall Farm.
Description
Broad Class
Transport
Period
History
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.
Exterior
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.
Interior
Reason for designation
One of a group of original Brecknock and Abergavenny Canal bridges.
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