Llanddetti Bridge (Canal Bridge No.139) is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 17 December 1998. Bridge. 1 related planning application.

Llanddetti Bridge (Canal Bridge No.139)

WRENN ID
lost-hinge-gold
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
17 December 1998
Type
Bridge
Address
Llanddetti Bridge (Canal Bridge No.139), Talybont-On-Usk, Powys, LD3 7YR
OS grid reference
SO 124 204
Coordinates
51.87616, -3.27324
Source
Cadw listing

Also on this page: sale history · EPC · related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Llanddetti Bridge, also known as Canal Bridge No. 139, is a hump-backed bridge constructed of rubble sandstone. The segmental arch is formed of thin voussoirs, and it is flanked by a low parapet with flat coping. The abutments curve outwards on both sides, and the parapet includes square end piers. A cast iron plaque, bearing the bridge number in relief, is positioned in the keystone of the arch on the eastern side. The towpath runs beneath the bridge on the north side and features a stone kerb. A stringcourse is located roughly at water level on the south side. The bridge deck is currently surfaced with a grass and concrete farm track, and two lozenge-shaped cast iron notices indicating weight restrictions are in place.

Local climate

Llanddetti Bridge (Canal Bridge No.139) sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.

It experiences an average of 57 freeze-thaw cycles a year, more than 96% of listed buildings. Of these, 32 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 2 transactions since 1995
  • Related listed building consents — 1 application
  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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  1. Llanddetty Hall Farmhouse Grade II 57 m
  2. Llanddetty Hall barn and attached ranges Grade II 91 m
  3. Wenallt Lower Bridge (Canal Bridge No.140) Grade II 328 m
  4. Group of 5 chest tombs S of St Tetta's church Grade II 439 m
  5. Church of St Tetta Grade II* 447 m
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  7. Group of 3 chest tombs E of St Tetta's church Grade II 462 m
  8. Wenallt Upper Bridge (Canal Bridge No.141) Grade II 605 m
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  10. Ashford Cottage Grade II 895 m