A435 Charlton Hill Landslip

The A435 at Charlton Hill to the south of Cheltenham runs north to south along the western slope of the Lilley Brook Valley and has been subject to ongoing cracking and movement of the road surface for many years. The road has been intermittently patched and resurfaced, and the southbound crawler lane has been partially closed.

We have been monitoring this site since 2014 and the findings suggest that there are four separate landslips along the section between Charlton Kings and the Seven Springs roundabout, all needing different approaches to resolve the problem.

 

What are we doing?

Having examined the options available, the proposal is to undertake slope stabilisation at the areas experiencing the most severe movement and where we have a good understanding of the type and depth of landslip.

The design to stabilise the landslip includes a sheet pile wall approximately 441m long and 12m deep. It is not currently possible to fix the entire length of road affected due to funding constraints. We will continue to monitor for further ground movements and will finalise the repairs needed on the rest of the road when funding becomes available.

The road will be resurfaced as part of the project from Seven Springs roundabout to Lilley Brook Golf Course.

The scope for the work at this location has also been reviewed and a larger package of improvements is now being proposed:

  • Slope stabilisation
  • Drainage improvements
  • Footway improvements
  • Carriageway resurfacing
  • Partial use of the crawler lane to provide a safe zone for cyclists travelling uphill

We aim to provide the full package of improvements and take advantage of the necessary road closure by carrying out all the work in one visit to help minimise disruption to the public as well as give best value for money.

We are currently finalising detailed design and will be looking to procure the construction contract over winter 2022.

Construction was originally scheduled to start in the summer of 2021 however, to allow time to identify further funding and plan for the full package of improvements, it was necessary to postpone the work until 2023. Construction is now planned for end of March 2023 – October 2023. Due to the construction activities required and for the safety of road users and construction staff, it will be necessary to close the road for the duration of the works to all users, including cyclists and pedestrians. The road closures and diversion routes will be posted on this web page in advance.

Why?

We are responsible for maintaining roads across the county. This is one of several sites identified for repair to ensure the safety of road users and to reduce future maintenance costs.

To report a problem on your highways please use our Report It form.

Further information

We will be holding a public drop-in event to give people an opportunity to find out details of the project and meet the contractor once the construction contract procurement has been completed. Once a date and location have been finalised, the details will be provided on our social media channels and on this web page.

If you have any further questions, please contact us by emailing highways@gloucestershire.gov.uk

Frequently asked questions

We have been monitoring the A435 at Charlton Hill since 2014 when part of the crawler lane collapsed. The findings suggest that there are four separate land slips along the section between Charlton Kings and the Seven Springs roundabout, all needing different approaches to fix the problem.

Semi-permanent traffic management has been put in place along sections of this stretch of road to protect users from the cracks in the crawler lane which were caused by the land slip.

Having examined the options available, the proposal is to undertake slope stabilisation at the areas experiencing the most severe movement and where we have a good understanding of the type and depth of landslip.

Several ground investigations have been carried out to identify the ground conditions and to enable the installation of monitoring equipment to observe ground movements.

The findings suggest that there are four separate land slips along this section, all needing different approaches to fix the problem.

We are currently finalising detailed design and will be looking to procure the construction contract over winter 2022 prior to construction in 2023.

The ground movements below the site are complex and we needed to fully understand what is going on underneath the road to make it safe for vehicles.

The repairs to the site will be expensive and funding needed to be available before work could progress.

As the works will require a road closure, we wanted to undertake a full package of improvements and take advantage of this by carrying out all the work in one visit to help minimise disruption to the public as well as give best value for money.

The design to stabilise the landslip includes a sheet pile wall approximately 441m long and 12m deep. It is not currently possible to fix the entire length of road affected due to funding constraints. We will continue to monitor for further ground movements and will finalise the repairs needed on the rest of the road when funding becomes available.

The road will be resurfaced as part of the project from Seven Springs roundabout to Lilley Brook Golf Course.

Construction is due to start at the end of March 2023 for approximately 6 months.

Once the construction dates have been finalised these will be posted on this web page in advance and on our social media channels.

Due to the construction activities required and for the safety of road users and construction staff it will be necessary to close the road during construction to all users, including cyclists and pedestrians.

We will be directly contacting residents affected by these works to discuss their access options.

The road closures and diversion routes will be posted on this web page in advance.

The estimated cost of the project is £3.5m. 

The project is being funded by Gloucestershire County Council and the Department for Transport.

These funds are specifically allocated for projects of this type and are not available for routine road maintenance.

When the road is closed, we will be maintaining access for residents and will be working hard to minimise disruption to the travelling public.

We have followed national guidelines for the diversion route and road signage, and will continue to monitor traffic in the local area and where appropriate provide additional signs. We strongly recommend vehicles and cyclists use our signed diversion when it is in place as it is suitable for all road users and will help avoid local congestion.

As part of the construction tender process, we will set out requirements for methods of working. This will set out the approach to minimise and mitigate the impacts of noise/pollution etc. during the construction period.

Yes, site survey work has been carried out to assess potential environmental impacts, and the scheme is being designed to take these into account. The environmental assessment will consider all the potential environmental impacts of the scheme and recommend how these can be alleviated.

Check this web page for regular updates on this scheme.

We will be holding a public drop-in event to give people an opportunity to find out details of the project and meet the contractor once the construction contract procurement has been completed. Once a date and location have been finalised, the details will be provided on our social media channels and on this web page.

 

Help us improve Highways

Don’t include personal or financial information like your National Insurance number or credit card details.