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Latitude: 51.5919 / 51°35'30"N
Longitude: -3.0272 / 3°1'37"W
OS Eastings: 328937
OS Northings: 188619
OS Grid: ST289886
Mapcode National: GBR J4.BWTC
Mapcode Global: VH7BC.H70Z
Plus Code: 9C3RHXRF+Q4
Entry Name: Cwrt-y-mwnws Lock, Monmouthshire and Brecon Canal
Listing Date: 14 September 1999
Last Amended: 14 September 1999
Grade: II
Source: Cadw
Source ID: 22327
Building Class: Transport
ID on this website: 300022327
Location: Isolated location, approximately 200 metres NW of Cwrt-y-mwnws. M4 motorway immediately N.
County: Newport
Community: Allt-yr-yn (Allt-yr-ynn)
Community: Allt-yr-Yn
Locality: Allt-yr-yn
Traditional County: Monmouthshire
Tagged with: Architectural structure
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.
Rectangular lock chamber of squared sandstone rubble; tooled sandstone copings. Rebate for removed lock gate to E; splayed retaining cheek walls beyond. Rubble weir at W end, with splayed retaining walls beyond. C20 timber bridge over lock chamber. Brick-lined overflow culvert to S.
Listed as a significant element of the engineering works associated with the Monmouthshire and Brecon Canal.
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