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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: 15 August 2024
Grade: II
Source: Cadw
Source ID: 17380
Building Class: Maritime
ID on this website: 300017380
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
Locality: Port Dinorwic
Built-Up Area: Y Felinheli
Traditional County: Caernarfonshire
Tagged with: Dock
Complete dock system with entrance lock, long dock crossed by bascule bridge and graving-dock at upper end, converted from a tidal inlet of Afon Heulyn, previously partially used as a quay. It was designed and supervised by Frank Oswell BA (Associate Member, Institution of Civil Engineers), at a cost of £18,527. Lock-gates and cast-iron bollards by Cleghorn & Wilkinson, Northwich; the bridge was constructed by Pearson & Knowles, based in Warrington. Work began in April 1897 and was completed in December 1900.
Port Dinorwic was successively developed and enlarged from the 1790s by the Assheton-Smith family of Vaynol, owners of the Dinorwic slate quarry, Llanberis. Their quarries produced by late 1890s almost one quarter of the entire output of Welsh slate. The outer end of the system probably incorporates stonework from the quays of the 1820s.
Dock system 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 single-leaf bascule bridge. Steel bridge pivots at S end (modified with an electric drive motor in 1912); sloping parapets become (at S end) semi-circular with teeth which engage with raising mechanism. E of bridge, 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.
A remarkable example of a complete dock-system built to service a Welsh industry of world importance.
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