Lock No 67 is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 28 August 1998. Lock.

Lock No 67

WRENN ID
standing-lancet-fen
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
Lock
Address
Lock No 67, Cwm Crawnon, Llangynidr, Powys
OS grid reference
SO 138 198
Coordinates
51.8706, -3.25198
Source
Cadw listing

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

Description

Lock No 67 is part of a group of three locks that complete a flight of five located west of Llangynidr. This lock raises the canal by 17 meters over a distance of 37 kilometers towards Brecon. Like the neighboring locks, the chamber has been largely refaced in brick. At the time of inspection in January 1998, the lock was undergoing repairs, with one gate missing and the others having been replaced in 1994. The stone-faced banks and by-pass overflow to the west were exposed due to the lock being drained.

Local climate

Lock No 67 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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  • 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. Lock No 68 Grade II 58 m
  2. Lock No 66 Grade II 132 m
  3. Tofs Lock Bridge (Canal Bridge No 135) Grade II 184 m
  4. Coombes Lock Bridge (Canal Bridge No 134) Grade II 455 m
  5. Workhouse Bridge (Canal Bridge No 136) Grade II 481 m
  6. Limekiln at Monmouthshire and Brecon Canal Sanitary Station Grade II 482 m
  7. Workhouse Bridge (Canal Bridge No.136) Grade II 483 m
  8. Lock No 65 Grade II 510 m
  9. Embanked Aqueduct carrying Monmouthshire and Brecon Canal over Afon Crawnon Grade II 554 m
  10. Dan-y-graig Bridge (Canal Bridge No.137) Grade II 773 m