Trebannws Multi-Overflow & Outlet Sluice from the Swansea Canal is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 26 October 1979. Sluice.
Trebannws Multi-Overflow & Outlet Sluice from the Swansea Canal
- WRENN ID
- secret-entrance-evening
- Grade
- II
- Local Planning Authority
- Neath Port Talbot
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 26 October 1979
- Type
- Sluice
- Address
- Trebannws Multi-Overflow & Outlet Sluice from the Swansea Canal, Pontardawe, SA8 4BN
- OS grid reference
- SN 712 027
- Coordinates
- 51.70889, -3.86474
- Source
- Cadw listing
Description
The Trebannws Multi-Overflow and Outlet Sluice from the Swansea Canal is a Grade II listed structure featuring small sandstone weirs arranged in steps that direct water from the Swansea Canal to the Afon Tawe. At the top of the weirs, on the southeast side adjacent to the towpath, there is a two-bay primary overflow chamber, which is reported to be partly lined with timber. This chamber connects to a ground sluice equipped with working paddle gear located to the north. Since 1979, this area has been partially covered, and 20th-century control machinery has been added. The secondary overflow above the weir is still intact.
Local climate
Trebannws Multi-Overflow & Outlet Sluice from the Swansea Canal sits in one of the wettest parts of the UK, with an average of 1,400 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 97% of listed buildings.
It experiences an average of 21 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 8 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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