Reservoir of former Llantrisant Colliery is a Grade II listed building in the Rhondda Cynon Taf local planning authority area, Wales. First listed on 7 October 1994. Terrace house.

Reservoir of former Llantrisant Colliery

WRENN ID
lost-string-evening
Grade
II
Local Planning Authority
Rhondda Cynon Taf
Constituency
Pontypridd MP: Alex Davies-Jones (Lab)
Country
Wales
Date first listed
7 October 1994
Type
Terrace house
Address
Reservoir of former Llantrisant Colliery, Ynysmaerdy Farm, Llanharan, Rhondda Cynon Taff
OS grid reference
ST 031 840
Coordinates
51.54705, -3.3983
Source
Cadw listing

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

Description

The reservoir of the former Llantrisant Colliery is a circular structure built between the rock faces of a former quarry along a small stream. It has a diameter of approximately 30 meters and stands about 9 meters high. The reservoir is made of a thin reinforced concrete shell with straight vertical sides that are topped with a narrow lip and a dished bottom. The use of concrete in this way was uncommon at the time it was built, showcasing a notable level of design skill.

Local climate

Reservoir of former Llantrisant Colliery sits in a wetter-than-average part of the UK, with an average of 1,150 mm of rain a year. This makes it wetter than 89% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 92% 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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  • Detailed attributes — period, style, materials, features
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Nearby listed buildings

  1. Cow Shed at Ynysmaerdy Farm (formerly stores of Llantrisant Colliery) Grade II 136 m
  2. Engine Hall of former Llantrisant Colliery Grade II 137 m
  3. Barn and cow house at Ynysmaerdy Farm Grade II 165 m
  4. Hay barn at Ynysmaerdy Farm (former winding engine house of Llantrisant Colliery) Grade II 200 m
  5. Explosives store of former Llantrisant Colliery Grade II 203 m
  6. Garage at Ynysmaerdy Farm (formerly part of Llantrisant Colliery) Grade II 206 m
  7. Revetment wall of former Llantrisant Colliery Grade II 208 m
  8. Stable and cow house at Lanelay Farm Grade II 1.2 km
  9. Y Felin Wynt Tower Grade II 1.3 km
  10. Water Pump including surrounding revetment walls Grade II 1.3 km