Stone-walled leat adjoining north-east side of Watermill at Glynllifon is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 8 September 1998. Water management structure.

Stone-walled leat adjoining north-east side of Watermill at Glynllifon

WRENN ID
cold-parapet-onyx
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
8 September 1998
Type
Water management structure
OS grid reference
SH 455 552
Coordinates
53.0725, -4.30734
Source
Cadw listing

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

Description

The structure is a stone-walled leat located on the north-east side of the Watermill at Glynllifon. This deep leat, which is cement-rendered, curves from the west drive to the wheel pit that powers the overshot waterwheel. On the north-west side, there is a square reservoir featuring its own iron sluice gates. Near the wheel, the original paddle for operating the main sluice is still present, along with part of the sluice itself. Beyond this point, the leat steps down and continues for the remaining distance within a slate-lined trough.

Local climate

Stone-walled leat adjoining north-east side of Watermill at Glynllifon sits in one of the wettest parts of the UK, with an average of 1,370 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 98% of listed buildings.

It experiences an average of 20 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 9 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.

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Nearby listed buildings

  1. Watermill to south-west of Stables including archway into mill yard and attached L-shaped range Grade II 18 m
  2. Stone Bridge to west of Watermill Grade II 34 m
  3. Stone Bridge on the main drive south of the Stables at Glynllifon Grade II 40 m
  4. Hay-barn to south of Watermill Grade II 46 m
  5. Children's Mill or Boat House Grade II 72 m
  6. Stable Courtyard at Glynllifon Grade II* 78 m
  7. Fountain Pool to east of Stable Courtyard Grade II 115 m
  8. Footbridge over service drive to west of Glynllifon House Grade II 117 m
  9. Inner arched entrance to courtyard between Palm House and Workshops Grade II 118 m
  10. Rubble-walled rear service drive to west of Glynllifon House Grade II 118 m