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Roman Bridge Penmachno is a post-medieval stone arch bridge spanning the Afon Machno in the Snowdonia region of North Wales. Despite its name, the bridge is not of Roman origin but dates to later centuries, likely constructed during the 16th or 17th century when such structures became increasingly common across Welsh valleys. The bridge's foundations rest upon Caradoc Rocks, a sturdy sequence of mudstone, siltstone and sandstone laid down during the Ordovician period over 450 million years ago. This bedrock has provided reliable anchorage for the structure throughout its existence.
The bridge exemplifies regional building traditions, employing locally quarried stone in its construction. Its single arch design is characteristic of medieval and post-medieval Welsh bridge engineering, allowing the river to flow freely beneath whilst providing dependable passage across the Machno for both pedestrians and stock animals. The crossing became essential for communities in this upland terrain where river valleys presented significant obstacles to movement and trade.
The structure is now protected by Cadw, the Welsh Historic Monuments Service, under reference CN189, recognising its historical and architectural significance. As a vernacular monument in the Machno valley landscape, the bridge represents a continuity of river-crossing infrastructure and remains a notable feature of this area's built heritage.
Roman Bridge Penmachno is a scheduled monument protected by Cadw under reference CN189. View the official record →
Roman Bridge Penmachno is a post-medieval stone arch bridge spanning the Afon Machno in the Snowdonia region of North Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CN189.
Roman Bridge Penmachno dates from the post medieval/modern period, and is classified as a bridge. It is one of over 32,000 scheduled monuments protected across the UK.
Roman Bridge Penmachno is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is CN189.
Several scheduled monuments lie within 10 km, including Fedw Deg Medieval House (1.8 km), Pont Rhyd-Llanfair (2.2 km), Y Foel Cairns (2.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Roman Bridge Penmachno's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Roman Bridge Penmachno stands on Caradoc Rocks (Undifferentiated), bedrock that formed in the Caradocian. The rock here is mudstone, siltstone and sandstone.