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Heritage classified

Key figures

Origin and history

The Gaulian bridge of Sainte-Catherine is a primitive building located between the communes of Plounévézel (Finistère) and Treffrin (Côtes-d'Armor), in Brittany. It crosses a stream on the ancient Roman road between Carhaix and Lannion, demonstrating its strategic importance from ancient times. Built of grey-blue shale dry stones, it consists of three uneven arches and four spurs, with a flat slab apron. Its total length is about 60 meters.

The origin of the bridge dates back to two distinct periods: the third century (Gaulian or Gallo-Roman era) and the seventh century (High Middle Ages), reflecting its continuous use over centuries. It was listed as a historic monument in 1927, and was classified in 1964, recognizing its outstanding heritage value. Owned by the municipality, it illustrates the old construction techniques and the role of communication routes in Brittany.

The bridge is also known as the Sainte-Catherine Bridge, with reference to a nearby place (Kergonan). Its corbelled architecture and the absence of mortar underline its craftsmanship and durability. Although its geographical accuracy is estimated to be poor (level 5/10), it remains a rare vestige of ancient and medieval road infrastructure in Brittany.

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