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Cof Cymru: National Historic Assets of Wales · Wales

Bottom Lock and Bridge, Monmouthshire and Brecon Canal

Allt-yr-Yn, Newport, Wales

A Grade II listed building in Allt-yr-yn, Newport, designated on 14 September 1999.

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Bottom Lock and Bridge, Monmouthshire and Brecon Canal, Allt-yr-Yn, Newport, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Listed building, Grade II
Broad class
Transport
Date of designation
14 September 1999
Locality
Allt-yr-yn
Community
Allt-yr-Yn
Unitary authority
Newport
Country
Wales
Coordinates
51.59760, -3.01165
Cadw reference
22330

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1636 map "Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ..." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1636 · Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ... (David Rumsey Map Collection, Stanford Libraries)
  • 1865 · England and Wales. England No. 6. (David Rumsey Map Collection, Stanford Libraries)
  • 1895 · Sheet 11. Ordnance Survey of England and Wales. (David Rumsey Map Collection, Stanford Libraries)
  • 1906 · 249 Newport (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1913 · Sheet 102. Newport. (David Rumsey Map Collection, Stanford Libraries)

Get directions ↗

This record in Cadw's own full report ↗

Cadw's description

Isolated location. Situated approximately 200 metres NE of Waen Lock. M4 motorway runs immediately NW.

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 rubble construction with tooled sandstone copings and quoins. Rebate for removed lock gate to NE with small bridge beyond. Semental arch, stone voussoirs. Straight SW parapet; humped to NE; cemented copings. Iron plate to NE side: ‘Gwasted No. 2 Bridge’. Bridge carries track to field gate. Deep stone-lined overflow ditch on SE side. Rubble weir at SW end, with splayed retaining walls beyond.

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

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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