French Mill and Tidal Barrier is a Grade II* listed building in the Pembrokeshire Coast National Park local planning authority area, Wales. First listed on 29 September 1971. Mill.
French Mill and Tidal Barrier
- WRENN ID
- guardian-steeple-reed
- Grade
- II*
- Local Planning Authority
- Pembrokeshire Coast National Park
- Constituency
- Mid and South Pembrokeshire MP: Henry Tufnell (Lab)
- Country
- Wales
- Date first listed
- 29 September 1971
- Type
- Mill
- Address
- French Mill and Tidal Barrier, Carew Village, Tenby, Carew
- OS grid reference
- SN 041 038
- Coordinates
- 51.69897, -4.83543
- Source
- Cadw listing
Description
The French Mill and Tidal Barrier is a Grade II* listed building consisting of three storeys plus an attic, constructed from local limestone with a rendered finish and a slate roof. The main elevations, facing east and west, feature five windows each, while the gable ends have two windows. The attic is illuminated by single windows in the gables. The small windows have cambered brick arches and 16-pane tilting casements, all of which have been restored. External steps lead down to the basement level at the southern end. The mill has several remedial tie rods that stretch across it and are anchored into external tie plates. The building is now accessed through the northern extension wing.
The Tidal Barrier is located across the estuary of the Carew River, approximately 300 meters west of Carew Castle. It consists of a stone-faced causeway with a clay core, about 150 meters long, featuring central floodgates and a spillway at the northern end. When operational, the barrier impounded a pool of over 9 hectares and provided a head of water of 3.3 meters.
Internally, the top floor serves as the bin-floor, beneath which is the stone-floor, and the ground level is designated as the meal-floor. The machinery has been restored, except for the northern wheel. The northern extension includes a reception area, which features an audio-visual room in its loft.
Local climate
French Mill and Tidal Barrier sits in one of the wettest parts of the UK, with an average of 1,190 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.
It experiences an average of 4 freeze-thaw cycles a year, fewer than 98% of listed buildings. Of these, 1 follows 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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