Furnace Dam is a Grade II listed building in the Monmouthshire local planning authority area, Wales. First listed on 29 September 2000. Dam.
Furnace Dam
- WRENN ID
- lone-flue-thunder
- Grade
- II
- Local Planning Authority
- Monmouthshire
- Constituency
- Monmouthshire MP: Catherine Fookes (Lab)
- Country
- Wales
- Date first listed
- 29 September 2000
- Type
- Dam
- Address
- Furnace Dam, Old Furnace, Chepstow, Wye Valley
- OS grid reference
- SO 515 002
- Coordinates
- 51.69874, -2.70228
- Source
- Cadw listing
Description
Furnace Dam is a structure made of rubble sandstone walling with a concrete abutment on the far bank. At the near end of the dam, there is a low arch with an elliptical head for the sluice. The dam features two central openings with rubble sides and varying sills for the spillways. The fourth opening on the far bank is now blocked with concrete, and the rubble sides have collapsed downstream. The central spillway has low parapets flanking a projecting ramp. Currently, the dam provides a head of water between 2 to 2.5 meters. It measures approximately 40 meters in length and about 2.5 meters in width. A modern wooden bridge is situated on top of the dam.
Local climate
Furnace Dam receives an average of 830 mm of rain a year. This makes it wetter than 55% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 59% of listed buildings.
It experiences an average of 39 freeze-thaw cycles a year, more than 76% of listed buildings. Of these, 18 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
- Sale history — 1 transaction since 2022
- 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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