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3rd Menai Crossing

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Public information exhibitions are being held to provide an update on the Welsh Government proposals for major improvements to the A55/A494/A548 Deeside Corridor in North East Wales.
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We are looking to build a 3rd bridge over the Menai Strait.


Project status: planned
Region/county: north Wales (Gwynedd/Anglesey)
Start date: 2020/2021
End date: 2022/2023
Cost: over £130m dependant on option selected
Design Consultants: AECOM/RML/Knight Architects.

Why we are doing it

The A55 is important locally, nationally and internationally. It provides the main economic artery for North Wales and forms part of the route Euro 22 on the Trans European Road network. Britannia Bridge is the only section within the UK that is not dual carriageway, and this acts as a significant bottleneck to commuter and holiday traffic.

The aims of the scheme are to:
  • improve capacity, reliability and journey times
  • improve network resilience
  • improve opportunities for non motorised users 
  • improve safety.

Current progress

A recent study concluded that improving capacity by introducing a three lane tidal flow configuration on the existing Britannia Bridge did not meet the required safety standards

A Strategic Outline Business case was completed in Spring 2016 which confirmed the need for a 3rd Menai Crossing

We have appointed consultants AECOM and RML to undertake a route selection study with a view to selecting a preferred route for the crossing.


Start Procuring Technical Advisors: Autumn 2016
Route Selection Study: Late 16 to Spring 18
Announcement of preferred route: Summer 2018

Next steps

We will be undertaking a route selection study to assess various options to address congestion on the existing Britannia Bridge. The route study is likely to take 18 months to complete and a public consultation will be undertaking as part of the selecting a preferred route.

How we are consulting

We held a public consultation between November 2007 and February 2008. A further public consultation will be needed before a preferred route is decided.