Cwm Prysor Viaduct

Cwm Prysor Viaduct is a stone railway bridge with nine arches that crosses the Afon Prysor valley. The structure rises significantly above the riverbed and displays the robust engineering methods typical of 19th century construction.

The Bala and Festiniog Railway built this bridge in 1882 as part of its route through the Welsh mountains. Operations ceased in 1961 when the railway line closed.

The structure demonstrates the craftsmanship of Welsh stonemasons and stands today as a visible reminder of the region's industrial past for those passing through.

You can explore the bridge on a walking path that follows the old railway track bed through the valley. The route offers reasonable access for visitors interested in experiencing the structure and surrounding landscape on foot.

Metal railings added during 1953 repairs are still visible on the original stone parapets. These later additions mark the final phase of maintenance before the line closed.

Location: Trawsfynydd

Elevation above the sea: 339.3 m

GPS coordinates: 52.93230,-3.82350

Latest update: December 12, 2025 16:42