HS2 has completed a landmark river re-naturalisation project in Warwickshire, delivering the most significant natural river realignment on the programme to date. At 749 metres in length, the realignment of the River Cole near Coleshill represents a major environmental achievement alongside the delivery of new rail infrastructure.
The project has reshaped the river to include new meander bends, restored natural flows, and created enhanced habitats both in the water and along its banks. These improvements are designed to maximise biodiversity and strengthen the ecological value of the area.
The works were necessary to enable construction of the Birmingham Spur of the Delta Junction—one of the most technically complex sections of the HS2 route. To accommodate two new viaducts and associated railway embankments, a section of the river had to be permanently realigned.
Designed by HS2’s Mott MacDonald SYSTRA Design Joint Venture and delivered by Balfour Beatty VINCI, the project combined engineering expertise with ecological best practice. Close consultation with stakeholders, including the Environment Agency, ensured a holistic, nature-based design. Excavation was completed in 2024, and following the removal of temporary dams, water now flows naturally through the new channel. Ongoing monitoring continues to track river flow, shape, and habitat establishment.
Alongside its environmental benefits, the scheme has been designed with communities in mind. When the area reopens, residents will be able to enjoy new public spaces including grassed embankments, footpaths, observation areas and Japanese-style stepping stones across water features. Inspired by the site’s history as an Edwardian boating lake, these recreational additions will enrich public enjoyment of the landscape.
This project forms part of HS2’s wider Green Corridor initiative, which is creating a connected network of climate-resilient habitats and new green spaces along the route—supporting both wildlife and local communities for the long term.
Simon Casey, HS2 Ltd’s Head of Environment for Main Works Civils said:
“As climate change continues to pose challenges, HS2 aims to create solutions that successfully integrate climate resilient infrastructure, environmental preservation and positive community benefit.
“The holistic approach to this River Cole realignment is a shining example of this and it’s incredibly exciting to see what the team has achieved. It is part of our wider Green Corridor programme and will create a valuable learning legacy for the civil engineering profession, providing a replicable model for future projects.”