Tower at Fort Williamsburg is a Grade II* listed building in the Gwynedd local planning authority area, Wales. First listed on 29 May 1968. Tower.

Tower at Fort Williamsburg

WRENN ID
swift-cobble-vetch
Grade
II*
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
29 May 1968
Type
Tower
Address
Tower at Fort Williamsburg, Glynllifon, Llandwrog
OS grid reference
SH 459 551
Coordinates
53.07088, -4.3001
Source
Cadw listing

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

Description

The Tower at Fort Williamsburg is a 2-stage octagonal structure built of brick with scribed cement render, set on a mound that offers wide views across the estate and out to sea. It features a crenellated parapet and a square vice tower on the south side. Band courses run above each floor, with the first floor having replaced semicircular headed horned sash windows, while the ground floor includes square-headed openings, including a doorway to the north-west and another leading to the stair tower. Above the main doorway is a stone plaque inscribed 'Williamsbourg Fort'.

The fort itself is roughly square, with redans at each of the four corners, surrounded by ditches and revetment walls. The tower has been much restored and lacks significant individual features. Inside, winding timber stairs lead to a single octagonal chamber on the first floor and continue up to the roof level.

Local climate

Tower at Fort Williamsburg 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.

More on this building

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Nearby listed buildings

  1. Magazine at Fort Williamsburg Grade II* 6 m
  2. Tunnel Passage at Fort Williamsburg Grade II* 21 m
  3. Gatehouse at Fort Williamsburg Grade II* 49 m
  4. Armoury at Fort Williamsburg including attached screen walls Grade II* 79 m
  5. Barracks at Fort Williamsburg Grade II* 94 m
  6. Outer Defensive Wall to Fort Williamsburg Grade II* 108 m
  7. Cascade at Glynllifon Grade II 234 m
  8. The Mill Folly Grotto including stone bridge, south of the Afon Llifon Grade II 242 m
  9. Fountain at end of east vista Grade II 255 m
  10. Eastern Cavern north of the path near main east vista fountain Grade II 281 m