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Dock System at Y Felinheli

A Grade II Listed Building in Y Felinheli, Gwynedd

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Latitude: 53.188 / 53°11'16"N

Longitude: -4.2047 / 4°12'17"W

OS Eastings: 252786

OS Northings: 367930

OS Grid: SH527679

Mapcode National: GBR 5L.3533

Mapcode Global: WH54D.C4Z9

Plus Code: 9C5Q5QQW+64

Entry Name: Dock System at Y Felinheli

Listing Date: 3 October 1996

Last Amended: 18 April 1997

Grade: II

Source: Cadw

Source ID: 17380

Building Class: Maritime

Location: Below village of Felinheli, aligned roughly E-W, curving slightly to follow line of natural inlet, the whole system some 500m long.

County: Gwynedd

Town: Y Felinheli

Community: Y Felinheli

Community: Y Felinheli

Built-Up Area: Y Felinheli

Traditional County: Caernarfonshire

Find accommodation in
Port Dinorwic


Complete dock system of 1900-02, with entrance lock, long dock crossed by swing-bridge and graving-dock at upper end, converted from a tidal inlet of Afon Heilyn, previously partially used as a quay. The system was to cost £18,527 in 1899, Philip Ayres, engineer, lock-gates and cast-iron bollards by Cleghorn & Wilkinson, Northwich. Port Dinorwic was successively developed and enlarged from the 1790's by the Assheton-Smith family of Vaynol, owners of the Dinorwic slate quarry, Llanberis. Their quarries produced by late 1890's almost one quarter of rhe entire output of Welsh slate. The outer end of the system probably incorporates stonework from the quays of the 1820s.


Dock system of 1900-1902, approx 500m long, following line of former natural inlet. At outer (W) end of system is entrance lock in dressed grey stone; 2 lock gates in wood with walkways over having railings consisting of iron posts and chains. Inner dock walls in red brick with massive stone capstones and dressings (some capstones replaced in concrete); ladders set into dock sides. Dock broadens inside lock before narrowing at draw-bridge. Steel draw-bridge pivots at S end (now electrically powered); sloping parapets become (at S end) semi-circular with teeth which engage in raising mechanism. E of drawbridge, the dock curves and varies in width, following line of the natural inlet. At inner end of system, is dry dock, or graving-dock, sealed by steel caisson. Dry-dock has stepped side-walls and polygonal E end.

Reasons for Listing

A remarkable example of a complete dock-system built to service a Welsh industry of world importance.

Recommended Books

Other nearby listed buildings

  • II Former Dock Offices at Y Felinheli
    At bottom of road from village to harbour, on S side of harbour, opposite drawbridge.
  • II No. 2 Bodarborth
    Situated on the SE side of main road, Stryd Bangor, some 200m NE of the War Memorial. Set behind contemporary low stone walls with matching timber gates.
  • II Bodarborth
    Situated on the SE side of main road, Stryd Bangor, some 200m NE of the War Memorial. Set behind contemporary low stone walls with matching timber gates.
  • II Ffinfa
    Situated on the SE side of main road, Stryd Bangor, NE of the War Memorial and between No 1 Bodarborth and Cae Gwyn. Set behind contemporary stone wall with panelled timber gate.
  • II Cae Gwyn
    Situated towards NE of Y Felinheli on SE side of main road, Stryd Bangor, some 100m NE of the War Memorial and next to Ffinfa. Set behind stone front wall with Gothic timber gate.
  • II War Memorial
    Situated diagonally set to main road, in corner of the grounds of Church House, by the road running SE to the former railway station.
  • II Former Railway Station
    At the end of a short road running SE off Stryd Bangor from the War Memorial.
  • II Vaynol Park Wall (the part in Y Felinheli Community)
    Part of the wall around Vaynol Park, this section in Y Felinheli community stretches from Glan-y-mor Lodge in the E to Bryntirion Lodge in the W.

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