The bridge has reached the end of its operational life and is beyond simple repair. Not replacing the bridge would mean restricting the weight of vehicles that use the bridge and closing lanes to carry out maintenance, causing considerable disruption to traffic and rail operations in the long term.
We are investing around £35m to rebuild the Power Road Bridge.
The bridge replacement works are part of our Road Modernisation Plan.
We will replace the bridge deck which sits beneath the carriageway and strengthen the abutments which support the bridge from below.
Work has begun and the project will be completed by the end of 2017.
The new structure replacing the existing bridge will have an expected design lifespan of 120 years.
Utilities (gas, electricity, water and telecommunications) in the existing carriageway will be relocated to a new service bridge. This will reduce the need to close traffic lanes on the road bridge during future maintenance of utility pipes or cables.
The new bridge will have wider footways and better facilities for pedestrians and cyclists making this section of the A406 safer for all users.
The project is divided into three key phases:
Our contractor Hochtief (UK) installed the new service bridge on the weekend of 16-17 July 2016.
Works are now underway to divert utilities from the existing carriageway to the new service bridge.
A single lane closure will be in place on the A406 North Circular Road (Gunnersbury Avenue) northbound until Sunday 23 October while we carry out these works.
Vehicle access to the A406 (Gunnersbury Avenue) bridge will still be possible from both directions during the works. A temporary 30mph speed restriction is in place.
Some temporary lane restrictions will be required during the works.
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At all times during the works we will ensure there is a safe route for pedestrians to cross the railway.
The footway on the western side of the bridge has been closed since the works started. Pedestrians should follow the signed diversion route on the eastern side of the bridge via the footbridge next to Princess Avenue.
During the works, pedestrians and cyclists might have to share the same space on the eastern side of the bridge. Cyclists are reminded to be considerate to pedestrians.
Preparation works are now underway for replacement of the main bridge. We are working increased hours, from 07:00 to 19:00 on weekdays and some Saturdays, Sundays and bank holidays.
To reduce noise, vibration and disruption during the works we are using a range of measures including:
We will also have recycling skips on site to ensure we recycle everything we can.
Local residents and businesses will be updated on the works.
We are delivering this project in partnership with Hochtief (UK) Construction, Ramboll and Parsons Brinckerhoff, and Skanska.
We are working closely with Network Rail, the London Boroughs of Hounslow and Ealing and the emergency services to minimise disruption and ensure the works proceed as safely, efficiently and as quickly as possible.