A35 Road and Bridge Essential Works (Redbridge Viaduct)

Last update: January 2018


Hampshire County Council is returning on Saturday 3 February 2018, weather permitting, to continue with repairs on the A35 Redbridge Viaduct and resurface the road to ensure the bridge can continue to be used by all traffic.

Redbridge Viaduct is a 50 year old bridge carrying westbound traffic out of Southampton over Test Lane, the railway and the river Test. Due to its age, the harsh marine environment and the large volumes of traffic that use this bridge it now requires essential repairs to the joints and concrete supports. The viaduct is 270 metres long, supported on nine reinforced concrete piers and 106 columns.

The current phase 1 of the bridge works involve replacing the old expansion joints between each span, which, due to their deterioration are leaking and causing water to run down the supports and columns underneath. The leaking water has caused deterioration of these reinforced concrete supports and columns and repairs are now necessary. In November 2017, thirteen expansion joints which lay across the bridge were replaced, along with tow thirds of a longitudinal joint that runs along the entire length of the bridge. This leaves only eight more expansion joints and the remaining third of the longitudinal joint to complete.

Work will continue on Saturday 3 February in a number of stages similar to the work carried out in November 2017 and is detailed below. Each stage has been designed to cause the least amount of disruption possible taking into consideration Southampton football match times, cruise ship time tables and bus travel, although unfortunately it is not possible to cause zero disruption. Concrete repairs under the structure will be completed at a later date once all the joints have been replaced.

In agreement with our neighbouring highway authorities: Highways England and Southampton City Council, a full closure of the westbound-only carriageway (outbound from Southampton) between Redbridge roundabout and Rushington roundabout will be required and diversion routes will be in operation. A full closure is required to ensure the safety of the travelling public and the workforce in such a tight space and allows a more expedient construction operation that improves the quality of the new joints and minimises the number of closures and inconvenience for the public

Cyclists and pedestrians will be diverted onto the north footway when necessary.

Where the work is taking place

View map of where the work is taking place.

Redbridge location map

When the work is taking place

The nature of the works make them highly weather dependant and a decision whether to go ahead with the works will be made in the days preceding each of the dates below.

Phase 1 – February and March 2018

  • A35 Westbound closed at 8pm on Saturday 3 February to 5am on Monday 5 February
  • A35 Westbound closed at 8pm on Saturday 10 February to 5am on Monday 12 February - due to a clash with a Southampton Football club fixture NO work will take place on this weekend
  • A35 Westbound closed at 8pm on Saturday 17 February to 5am on Monday 19 February
  • A35 Westbound closed at 8pm on Saturday 24 February to 5am on Monday 26 February
  • A35 Westbound closed at 8pm on Saturday 3 March to 5am on Monday 5 March

Phase 2 – March 2018 onwards

Resurfacing work will be carried out on the Eastbound carriageway from Rushington roundabout to the Redbridge Causeway starting in March 2018. This work will be undertaken under a full road closure on Saturday and Sunday nights between 8pm and 5am for approximately three weekends (weather permitting). These works will not include any daytime closures.

As with the phase 1 works, signed diversions will be provided to cater for non-motorway and motorway traffic. Additional routine maintenance operations such as drainage cleansing and safety fence repairs will be carried out at the same time.

Phase 3 – Autumn 2018

The final stage of the project is to repair the concrete supports underneath the bridge to avoid the need for reduced weight limits being imposed for traffic crossing the bridge. This work has been provisionally planned for Autumn 2018.

Diversion routes

Signed diversions will be in place during the closures. The majority of drivers will use the diversion along M271, M27 and A326. For drivers who are not able to use the motorway the diversion will be via Romsey. The motorway diversion will increase travel by approximately 12minutes (8miles).

The eastbound route into Southampton will not be affected during the Phase 1 works.

View the diversion route

  • Name Highways Bridges
  • Email roads@hants.gov.uk
  • Phone 0300 555 1388 (0300 555 1390: Minicom)
Economy, Transport and Environment Department
Hampshire County Council
The Castle

SO23 8UD