Revitalising Pont Briwet

Pont Briwet is a Grade II listed viaduct which carries the Cambrian Railway and a single-lane toll road over the Afon Dwyryd estuary, a beautiful coastal landscape close to the Portmeirion tourist attraction featured in the cult 1960s show, The Prisoner.

Network Rail and Gwynedd County Council jointly propose to reconstruct the bridge to provide a new wider rail and two-lane road viaduct suitable for carrying heavier traffic, as well as linking the local footway and cycleway networks either side of the estuary. The new viaduct will remove the need for the onerous ongoing maintenance that is currently necessary to keep the existing bridge open.

Tony Gee has been employed by Network Rail to design and supervise the ground investigations and topographical surveys, all now complete, and to produce the designs for the new rail and road bridges and causeway approaches. The new viaduct, located in a Site of Special Scientific Interest and a Special Area of Conservation, will comprise seven 20 m integral spans, formed from prestressed beams supported on concrete crossheads and large diameter concrete piles installed into the estuarine sands and gravels.

December 2010

Pont Briwet