After the Storm: Re-building Treforest’s Castle Inn Footbridge

Introduction – Storm Dennis and a Community Cut in Two

February 2020’s Storm Dennis left deep scars across Rhondda Cynon Taf. Among the hardest-hit assets was the Grade II listed Castle Inn Footbridge linking River Street, Treforest, with Cardiff Road, Glyntaff. The three-arch masonry bridge not only funnelled everyday foot traffic between homes, the University of South Wales campus and local shops, but its piers also trapped debris and worsened flood levels. Storm Dennis swept through, the piers became a dam and the old structure was fatally compromised. By 2021 the bridge had to be demolished, severing a decades-old shortcut and forcing residents onto a lengthy roadside detour.

Fast-forward to February 2024: a new 35-metre single-span steel truss bridge now soars across the River Taff, reconnecting the two communities and delivering vastly improved flood resilience. The replacement, delivered by Rhondda Cynon Taf County Borough Council and main contractor Knights Brown, relied on specialist fabrication, assembly and heavy-lift expertise from Beaver Bridges Ltd. Funded from a £3.6 million Welsh-Government Storm Dennis repair programme, the scheme embodies building back better in action.

1. Design for Resilience: A Single-Span Active-Travel Bridge

Early scoping by WSP and the Council concluded that any new crossing must:

• Remove in-river piers to restore hydraulic capacity and reduce flood risk;
• Meet Active Travel standards – 3.5 m clear deck for shared pedestrian–cycle use;
• Incorporate utility provision – a key sewer pipe slung beneath the deck;
• Respect local heritage – re-use stonework from the original bridge for abutment cladding.

Beaver Bridges fabricated the 100-tonne weathering-steel truss in transportable modules, each shot-blasted, trial-fit and coated off-site for rapid assembly. Re-engineered concrete abutments were poured clear of the river’s main flow, with scour protection and west-bank training walls cast to withstand future flood events.

2. Installation Challenge: Lifting 100 t over a Narrow Valley

The valley’s tight footprint left no room for incremental launching. Instead, Beaver Bridges pre-assembled the full truss in a compound on Cardiff Road, then teamed with Baldwins Cranes to execute a single 1000-t crawler-crane lift during a summer-holiday road closure. Extensive temporary works stabilised the crane pad – engineered fill, driven piles and load-spread mats – to handle ground-bearing pressures at the water’s edge.

By dawn on 30 August 2023 the bridge sat on its elastomeric bearings, perfectly aligned. Local spectators cheered from both banks – a visible milestone after years of detours and construction noise.

3. Working in the River: Pontoons, Cladding and Finishing Touches

Post-installation works stretched into 2024. Because winter salmon-run restrictions bar river access, Knights Brown and Beaver Bridges returned in May 2024 to complete stone-cladding of the west abutment. A pair of modular work pontoons enabled masons to reach the river-facing walls while the bridge stayed open to users – traffic lights on Cardiff Road briefly lifted materials in and out. The pontoons eliminated the need for scaffold towers in the high-flow channel and cut programme risk from summer thunderstorms.

4. Opening Day Relief: A Lifeline Restored

The new footbridge officially opened to pedestrians and cyclists on 14 February 2024. Within hours, families were once again strolling from Treforest estate to shops on Cardiff Road; university students shaved ten minutes off their walk to lectures; and the nightly jogging circuit along the Taff Trail felt whole again.

Councillor Andrew Morgan OBE summed up local sentiment:

“Replacing this bridge has restored a lifeline for our community. It’s safer, more flood-resilient, and built for active travel. Thank you to residents for their patience and to the project team for delivering such a complex scheme.”

5. Lessons Learned and Lasting Value

Beyond reinstating a foot route, the bridge now forms part of Rhondda Cynon Taf’s wider Active Travel network, inviting healthier commuting and tourism along the Taff corridor. Its flood-friendly design underpins future resilience; its modern deck and lighting provide inclusive, 24-hour access.

Conclusion

Castle Inn Footbridge proves that community recovery and engineering excellence can go hand-in-hand. From demolition of a storm-damaged relic to installation of a flood-ready, accessible crossing, Beaver Bridges and partners turned disaster into opportunity – delivering a structure that is stronger, wider and future-proof. As Wales continues to bolster its infrastructure against extreme weather, projects like Castle Inn demonstrate how building back better is less a slogan than a practical, people-centred reality.

For councils or developers facing similar post-flood reconstruction challenges, Beaver Bridges’ turnkey expertise – from detailed design through heavy lifts and river-work logistics – offers a proven path to restoring vital links quickly, safely and sustainably.

Interested in fast-track bridge solutions? Get in touch with Beaver Bridges. We’re ready to help communities reconnect and thrive.