Bottom Lock and Bridge, Monmouthshire and Brecon Canal is a Grade II listed building in the Newport local planning authority area, Wales. First listed on 14 September 1999. Lock and bridge.

Bottom Lock and Bridge, Monmouthshire and Brecon Canal

WRENN ID
lone-step-grain
Grade
II
Local Planning Authority
Newport
Constituency
Newport West and Islwyn MP: Ruth Jones (Lab)
Country
Wales
Date first listed
14 September 1999
Type
Lock and bridge
Address
Bottom Lock and Bridge, Monmouthshire and Brecon Canal, Allt-Yr-Yn
OS grid reference
ST 300 892
Coordinates
51.5976, -3.01166
Source
Cadw listing

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

Description

The Bottom Lock and Bridge on the Monmouthshire and Brecon Canal is a lock chamber built from rubble, featuring tooled sandstone copings and quoins. There is a rebate for a removed lock gate to the northeast, with a small bridge located beyond it. The structure includes a segmental arch made of stone voussoirs. The southwest parapet is straight, while the northeast side is humped, with cemented copings. An iron plate on the northeast side reads ‘Gwasted No. 2 Bridge’. This bridge supports a track leading to a field gate. On the southeast side, there is a deep stone-lined overflow ditch, and at the southwest end, a rubble weir is present, accompanied by splayed retaining walls beyond.

Local climate

Bottom Lock and Bridge, Monmouthshire and Brecon Canal receives an average of 930 mm of rain a year. This makes it wetter than 71% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 72% of listed buildings.

It experiences an average of 35 freeze-thaw cycles a year, more than 55% of listed buildings. Of these, 14 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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