From congestion to connectivity: delivering the Killaloe–Ballina Bypass and Brian Boru Bridge project

Introduction

The Killaloe Bypass, Shannon Bridge Crossing (officially named the Brian Boru Bridge), and R494 Improvement Scheme is a landmark infrastructure project in Ireland’s Mid-West region. Formally opened in May 2025, this comprehensive engineering solution addresses the critical transport bottleneck that has historically constrained the twin heritage towns of Killaloe, Co. Clare, and Ballina, Co. Tipperary.  The project was delivered by Clare County Council in partnership with Tipperary County Council and funded by the Department of Transport under Project Ireland 2040.

The Brian Ború Bridge, part of the Killaloe–Ballina Bypass, was officially opened on 22 May 2025, at a ceremony attended by Minister Darragh O’Brien and other dignitaries.

How the concept and the need came about

The need for this project was driven by the severe limitations of the existing 18th-century stone masonry bridge crossing the River Shannon. For decades, this 13-arch heritage bridge served as the primary link between the two towns, yet its narrow width of less than five meters could not accommodate two-way vehicular traffic and presented constant safety concerns for the other vulnerable road users that shared the bridge on a daily basis.

Key drivers for the project included:

• Infrastructure deficits: The historic bridge operated via a one-way shuttle traffic light system, which created extensive tailbacks and acted as a major bottleneck for the wider Lough Derg region particularly for traffic heading onwards from East Clare and North Tipperary.
• Safety hazards: Pedestrians and cyclists were forced to share the narrow bridge with heavy goods vehicles (HGVs), creating a high-risk environment.
• Economic constraint: The congestion discouraged local investment and hindered the development of the towns as prime tourism destinations.
• Long-term planning: Formal feasibility studies began as early as 1996, with the project eventually becoming a central pillar of regional transport strategies and the National Development Plan.

The challenges of building the project

Delivering a multi-element infrastructure scheme in a sensitive environment presented significant engineering and environmental hurdles:

• Environmental sensitivity: The River Shannon is a designated Special Area of Conservation (SAC). Construction required strict adherence to “in-stream” working windows mandated by Inland Fisheries Ireland to protect local aquatic life.
• Complex engineering: The Brian Boru Bridge is a 207-meter-long steel arched truss structure and its assembly required the use of Ireland’s largest crawler crane to lift and place heavy steelwork over the river while working from land.
• Topography and logistical constraints: The Killaloe Bypass involved deep cuttings through challenging terrain, requiring the management of large volumes of material under variable weather conditions.
• Architectural vision: A primary goal was to maintain the architectural vision of the late Kit Powell-Williams (1950–2024), ensuring the new bridge complemented the historic landscape while meeting modern structural and safety standards.

Source: Clare County Council

The benefits of the project

The scheme has fundamentally transformed regional connectivity and safety:

• Congestion relief: By providing a high-quality bypass and a new river crossing, the project has removed through-traffic and HGVs from the narrow streets of Killaloe and Ballina.
• Enhanced safety and wellness: The project delivered over 6km of segregated pedestrian and cycle facilities, encouraging active travel and significantly reducing the risk of collisions.
• Reduced journey times: End-to-end journey times through the area have been reduced by up to 50% during peak periods.
• Environmental impact: The reduction in traffic congestion and idle times has led to a measurable decrease in CO2 emissions within the town centres. The Designers, RPS optimised the bridge structure design by switching to a steel composite ladder deck and introducing pier openings, the project saved approximately 1,000m³ of concrete and 100 tonnes of reinforcement, resulting in a total embodied carbon saving of approximately 155 tonnes of CO2e.

Enabling the Killaloe Ballina Master Plan

• This infrastructure project serves as the vital “enabler” for the Killaloe Ballina Town Enhancement & Mobility Plan. Killaloe recently received RRDF funding for a major twin-town regeneration project focused on:
  • Public realm upgrades: Improved streetscapes, pedestrian and cycle routes, signage, and mobility features.
  • Cultural development: Repurposing the old Killaloe Courthouse into a cultural and music hub.
  • Sustainable transport: Enhancing pedestrianisation (including trial closure of the old bridge), better traffic management, and connectivity between Killaloe and Ballina.

The goal is to boost tourism, local business, and community vibrancy through infrastructure, cultural spaces, and sustainable mobility improvements. The Killaloe Bypass, Shannon Bridge Crossing & R494 Improvement Project has enabled this funding to be achieved and has acted as a catalyst for further development of the twin towns.

By redirecting heavy traffic away from the town centres, one of the most significant outcomes is the repurposing of the historic 18th-century bridge. With vehicular traffic removed, the old bridge has now transitioned into a pedestrian and cyclist-friendly zone. This creates a seamless, safe civic space linking the historic centres of Killaloe and Ballina, acting as a focal point for community integration and tourism.

The benefits of this shift are remarkable:

• Public realm transformation: The removal of vehicles from the old bridge has created a safe, scenic walkway that reunites the two towns as a cohesive pedestrian-friendly hub.
• Tourism synergy: The project connects to existing and proposed Greenways, potentially creating over 360km of linked active travel routes along the River Shannon, bolstering the “Destination Lough Derg” tourism strategy.
• Economic vitality: With a quieter, safer, and more aesthetic town centres, local businesses benefit from increased footfall, and the historic character of the towns is preserved for future generations.

In summarising the project, Clare County Council Deputy Chief Executive and Director of Services Alan Farrell said,

“The Brian Ború Bridge will support the vitality of Ballina, Killaloe, and the wider region for generations to come. Delivering this project was not without its challenges—from working in a sensitive river environment to coordinating complex engineering and traffic management—but the benefits are clear. We now have a modern crossing that improves connectivity, reduces congestion, and enhances safety for all road users, while also creating opportunities for tourism and economic growth across Clare and Tipperary.”