North Bristol relief sewer 

Construction of a new 6.5km pipeline began in summer 2019 and is planned to finish by spring 2023. It will connect Bristol’s existing trunk sewer in Lawrence Weston to the Frome Valley relief sewer near Cribbs Causeway and will direct waste more efficiently around North Bristol to our water recycling centre in Avonmouth.

The majority of the sewer has been constructed by tunnelling underground using a tunnel boring machine, reducing the need to dig trenches. We have even tunnelled underneath the M5 motorway and Network Rail’s Henbury Loop freight railway.

We are working with contractors J. Murphy & Sons Ltd to construct the tunnel and lay the pipework.

The North Bristol relief sewer forms an essential part of our long-term sewerage strategy for the next 100 years.

Our tunnel boring machine has recently finished its journey. Watch the video below to see how the tunnel is built and click the drop-down options to find out relevant information for each area of North Bristol where activity is happening.