Lower Lock Bridge (Canal Bridge No 132), including Lock No 64 is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 28 August 1998. Bridge.

Lower Lock Bridge (Canal Bridge No 132), including Lock No 64

WRENN ID
final-clay-bone
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
28 August 1998
Type
Bridge
Address
Lower Lock Bridge (Canal Bridge No 132), including Lock No 64, Cwm Crawnon, Llangynidr, Powys
OS grid reference
SO 147 199
Coordinates
51.87193, -3.24029
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Lower Lock Bridge, also known as Canal Bridge No 132, is a hump-backed bridge built of rubble sandstone. It features a segmental arch with thin voussoirs and keystones, and has a low parapet. The abutments curve outwards on both sides, and the parapet includes square end piers to the south. On the east side, there is a cast iron plaque displaying the bridge number in relief.

The canal banks on the east side retain the masonry channels of a surviving stop-lock, with a by-pass overflow to the south.

Lock No 64 is the first in a series of five locks that conclude a 37-kilometer pound and raise the canal by 17 meters towards Brecon. The lock chamber is faced in brick, and the lock gates were replaced in 1996.

Local climate

Lower Lock Bridge (Canal Bridge No 132), including Lock No 64 sits in a wetter-than-average part of the UK, with an average of 1,100 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 74% of listed buildings.

It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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.

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Nearby listed buildings

  1. Embanked Aqueduct carrying Monmouthshire and Brecon Canal over Afon Crawnon Grade II 334 m
  2. Limekiln at Monmouthshire and Brecon Canal Sanitary Station Grade II 346 m
  3. Lock No 65 Grade II 347 m
  4. Coombes Lock Bridge (Canal Bridge No 134) Grade II 370 m
  5. Bank of Limekilns beside Monmouthshire and Brecon Canal east of Bridge No 131 Grade II 545 m
  6. Llangynidr Bridge (partly in Llanfihangel Cwmdu with Bwlch and Cathedine community) Grade I 571 m
  7. Mowfield Cottage Grade II 578 m
  8. Lock No 66 Grade II 687 m
  9. Green Drive Lodge Grade II 745 m
  10. Lock No 67 Grade II 816 m