By-Pass Pond and Spillway with Sluice-Gate to south of upper lock chamber is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 5 April 1993. Post box.

By-Pass Pond and Spillway with Sluice-Gate to south of upper lock chamber

WRENN ID
dreaming-casement-oak
Grade
II
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
5 April 1993
Type
Post box
Address
By-Pass Pond and Spillway with Sluice-Gate to south of upper lock chamber, Carreghofa Locks, Carreghofa
OS grid reference
SJ 254 202
Coordinates
52.77479, -3.10649
Source
Cadw listing

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

Description

The by-pass pond and spillway with a sluice-gate located to the south of the upper lock chamber features a curving rubble revetment. The culverts are brick-lined and have repairs made in later 19th century blue brick. The spillway has been refaced using modern engineering bricks. In the center of the spillway, there is paddle gear, which operates a rack and pinion system built on a wooden frame with a separately braced ratchet catch.

Local climate

By-Pass Pond and Spillway with Sluice-Gate to south of upper lock chamber receives an average of 850 mm of rain a year. This makes it wetter than 58% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 66% of listed buildings.

It experiences an average of 41 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 22 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
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Nearby listed buildings

  1. Upper Lock Chamber Grade II 16 m
  2. Toll Gauger's Hut to E of No 1 The Locks Grade II 25 m
  3. Pigsty with Walled Pen to E of No 1 The Locks Grade II 40 m
  4. Lock Gates and Paddle Gear Grade II 44 m
  5. Former Wharfinger's House including brick boundary wall to road Grade II 62 m
  6. Lower Lock Chamber Grade II 75 m
  7. Lower Lock Chamber to W of No 1 THe Locks Grade II 91 m
  8. Lock Gates and Paddle Gear Grade II 91 m
  9. By-Pass Culvert and Overflow Grade II 93 m
  10. Pentref Grade II 248 m