Dam to SW of former Felin Fawr Slate Works is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 26 July 2001. Dam.

Dam to SW of former Felin Fawr Slate Works

WRENN ID
ragged-flagstone-ash
Grade
II
Local Planning Authority
Gwynedd
Constituency
Bangor Aberconwy MP: Claire Hughes (Lab)
Country
Wales
Date first listed
26 July 2001
Type
Dam
Address
Dam to SW of former Felin Fawr Slate Works, Coed Y Parc, Llandygai
OS grid reference
SH 614 661
Coordinates
53.17477, -4.0749
Source
Cadw listing

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

Description

The high dam wall located to the southwest of the former Felin Fawr Slate Works is constructed from large slate blocks. The wall is roughly coursed and slightly battered, following a gentle curve across the valley floor. It features two cast-iron sluices and a brick-lined spillway in the center. At the base of the dam, there are remains of four cast-iron pipes that are partially supported on a stone causeway, which once directed water downstream to different areas of the slate works site.

Local climate

Dam to SW of former Felin Fawr Slate Works sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 90% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 19 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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  1. Pont Coed-y-parc Grade II 117 m
  2. Foundry at Felin Fawr Slate Works Grade II 160 m
  3. Fitting and Repair Shop at Felin Fawr Slate Works Grade II 169 m
  4. Western Slab Mill at Felin Fawr Slate Works Grade II* 178 m
  5. Water Wheel House between slab mills at Felin Fawr Slate Works Grade II* 184 m
  6. Eastern Slab Mill at Felin Fawr Slate Works Grade II* 193 m
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  10. 2 Bryn Eglwys Grade II 461 m