A435 Charlton Hill Landslip
We have been monitoring the A435 Charlton Hill since 2014 when part of one lane collapsed. 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.
Traffic management was initially put in place along this stretch of road to protect users from the cracks in the crawler lane which were caused by a land slip; however, these have now been replaced by semi-permanent bollards.
We need to fully understand what is going on underneath the road in order to make it safe for vehicles. At the moment the rest of the road is safe to use and traffic can still flow on Charlton Hill.
What are we doing?
Work is currently being done to design a solution for the worst affected areas of the road where we have a good understanding of the type and depth of landslip.
The scope for the work at this location on the A435 has been reviewed and a larger package of improvements is now being proposed:-
- Slope stabilisation
- Drainage improvements
- Footway improvements
- New southbound (uphill) cycleway to utilise the now redundant crawler lane as part of our commitment to sustainable travel
- Carriageway resurfacing
The total cost of this package of improvements exceeds the budget currently available for the work so we are now looking to identify further sources of funding.
We want to be able 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.
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 has now been necessary to postpone the work until 2022.
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.
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Frequently asked questions
What is happening on the A435?
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.
What have we been doing about it?
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.
Why has it taken so long to do something?
The ground movements below the site are complex and we need to fully understand what is going on underneath the road in order to make it safe for vehicles.
The repairs to the site will be expensive and funding needed to be available before work could progress.
How will the road be repaired?
The design to stabilise the landslip includes a sheet pile wall approximately 400m 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 work.
Will the road layout be restored to how it was before the landslip?
No; a new southbound (uphill only) cycleway will be constructed to replace the existing crawler lane. This will be a dedicated cycleway separated from the traffic.
Unfortunately, there is not space to include a northbound (downhill) cycle lane because of the limited width of the verge along sections of the carriageway.
When will the work start and finish?
Construction is due to start in 2022.
Once the construction dates have been finalised these will be posted on this web page in advance.
How long will the work take?
Construction work is expected to take approximately 6 months. We will try to keep the road open when possible during this period; however some closures will be necessary.
Further updates on the length of time needed for the work will be made available closer to the time on this webpage.
Will the road remain open for traffic and cyclists during construction?
We will try to keep the road open under traffic lights when possible. However for the safety of road users and construction staff it will be necessary to close the road for periods of time. The road closures and diversion routes will be posted on this webpage in advance.
Will pedestrian access be maintained during construction?
We will try to maintain pedestrian access where possible. However for the safety of the public and construction staff it will be necessary to prevent pedestrian access at times. Any restrictions to pedestrian access will be advised on this webpage in advance of the works.
What is the estimated cost of the scheme?
The estimated cost of the slope stabilisation work is £2.5m.
Who is paying for the scheme?
The slope stabilisation work is being funded by Gloucestershire County Council.
Why can't these funds be spent on routine maintenance, such as filling potholes?
These funds are specifically allocated for projects of this type and are not available for routine road maintenance.
When the road is closed this work is going to disrupt my journey, what will you be doing to help?
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 use our signed diversion when it is in place as it is suitable for all road users and will help avoid local congestion.
How will you avoid creating excessive noise and air pollution during construction?
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.
Have you considered the potential environmental impacts of the scheme?
Yes; site survey work will be carried out to assess potential environmental impacts, and the scheme will be designed to take these in to account. We will carry out an environmental assessment which will consider all the potential environmental impacts of the scheme, and how these can be alleviated.
Where can I find out more about the proposed scheme?
Check this webpage for regular updates on this scheme.