Offa's Pool Dam is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 20 March 1998. Research centre.
Offa's Pool Dam
- WRENN ID
- veiled-plinth-twilight
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
- Country
- Wales
- Date first listed
- 20 March 1998
- Type
- Research centre
- Address
- Offa's Pool Dam, Offa's Dyke, Forden with Leighton and Trelystan
- OS grid reference
- SJ 254 047
- Coordinates
- 52.63495, -3.10355
- Source
- Cadw listing
Description
Offa's Pool Dam is a brick structure approximately 70 meters long, with each end returning into a natural bank. The inner face features shallow buttresses, and the wall is topped with a stone coping. On the outer side of the wall, there is an earthen ramp. Positioned midway along the inner face is a cast iron sluice box.
Local climate
Offa's Pool Dam receives an average of 860 mm of rain a year. This makes it wetter than 61% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 55% of listed buildings.
It experiences an average of 45 freeze-thaw cycles a year, more than 86% of listed buildings. Of these, 24 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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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- 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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