History

Plas Llwyngwern is a gentry house in Powys (Glantwynmyn community), said to have been built by the owners of a local slate works. The associated bridge was built in 1853 and now serves as the approach to the Centre for Alternative Technology.

Exterior

Built of fine ashlar. An elliptical arch spanning 12m of well-formed voussoirs rising 5.1m above water level to a central raised keystone. Flush spandrels and parapet above a horizontal string course. At each end
wide slightly battered pilasters, each articulated with a blind pointed arch. The carriageway is level with a formation of 3.8m between the low 0.45m thick parapets, each capped with large copings between hipped stones. On the inner face, oval slate plaques; on one side a mantled coat of arms dividing the date 18 53, and on the other the name Pont Llwyngwern. The running surface has been raised and now partly obscures the fine lettering. The parapets extend to the W, entry, end, and form an oval embayment.

Reasons for Listing

Included as an elegant and well-constructed road bridge of high quality, and for its historic interest.

External Links

• Cadwr Listing
• Wikidata Q29505597

External links are from the relevant listing authority and, where applicable, Wikidata. Wikidata IDs may be related buildings as well as this specific building. If you want to add or update a link, you will need to do so by editing the Wikidata entry.

Recommended Books

• 
  Nottinghamshire (Pevsner Architectural Guides: Buildings of England)
• 
  Pevsner's Architectural Glossary (Pevsner Architectural Guides: Introductions)
• 
  Staffordshire (Pevsner Architectural Guides: Buildings of England)
• 
  Department for Communities Listed Historic Buildings of Northern Ireland: Information Guide for the 2nd Survey of Historic Buildings
• 
  Building Small Projects (New Best of Fine Woodworking)
• 
  The Listed Buildings and Other Principal Structures at the Royal Gunpowder Mills Waltham Abbey