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Waen Lock, Monmouthshire and Brecon Canal

A Grade II Listed Building in Allt-yr-Yn, Newport

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Latitude: 51.5963 / 51°35'46"N

Longitude: -3.0129 / 3°0'46"W

OS Eastings: 329932

OS Northings: 189093

OS Grid: ST299890

Mapcode National: GBR J5.BLTM

Mapcode Global: VH7BC.Q4JL

Entry Name: Waen Lock, Monmouthshire and Brecon Canal

Listing Date: 14 September 1999

Last Amended: 14 September 1999

Grade: II

Source: Cadw

Source ID: 22331

Building Class: Transport

Location: Isolated location. Situated approximately 150 metres NE of Dock Lock.

County: Newport

Community: Allt-yr-yn (Allt-yr-ynn)

Community: Allt-yr-Yn

Locality: Allt-yr-yn

Built-Up Area: Newport

Traditional County: Monmouthshire

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The eastern branch of the Monmouthshire and Brecon Canal was authorised by Act of Parliament in 1792, and officially opened in 1799. It ran from Newport to Pontnewynydd, and was engineered by Thomas Dadford Jnr. The canal connected with several tramroads belonging to the same company (Monmouthshire Canal Navigational Company), carrying coal down to the wharves. The branch was 17.7 km long, and rose 136.2 metres through 42 locks. The contemporary western branch, 19 km long, ran to Crumlin. In 1812, the eastern branch was connected to the Brecon and Abergavenny Canal at Pontymoile Basin, and this became the main line. In 1853-55, the Monmouthshire Railway and Canal Company built a railway down to Newport, the company amalgamating with the Great Western Railway in 1880. The canal then became increasingly disused. The Crumlin branch closed in 1949, the main line in 1962.


Lock chamber of brick construction with intermittent ashlar blocks; tooled sandstone copings (some missing) and quoins. Rebate for removed lock gate to NE. with splayed rubble retaining walls for some 10 metres beyond; stone copings. Deep overflow ditch on SE side. Rubble weir at SW end, with splayed retaining walls beyond.

Reasons for Listing

Listed as a significant element of the engineering works associated with the Monmouthshire and Brecon Canal.

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