For the first time in more than 200 years, the tide is moving through part of Greatham Marsh again. It is not an accident or a breach in the bank. It is the result of a carefully planned £4.5 million restoration intended to give a section of the Tees Estuary back some of its natural rhythm.
The Environment Agency has completed work to restore the original course of Greatham Beck and remove a tidal barrier from land that was claimed from the sea more than two centuries ago. The change allows seawater to the marsh on the tide, beginning the slow process of rebuilding that once formed a much larger part of the estuary.
Space for saltmarsh to return
About 21.3 hectares of coastal saltmarsh, mudflat and high-tide roosts are expected to develop through natural processes. The beck itself had been diverted around 50 years ago. Sections of an old flood bank and a sluice that was no longer needed have now been removed, allowing water to follow a more natural route.
That matters because saltmarsh is unusually useful ground. It gives wading birds somewhere to feed and rest, offers young fish and other wildlife shelter, traps nutrients before they can damage mudflat habitats and stores carbon in its soils. The Environment Agency says curlews and avocets are among the internationally important species expected to benefit, while migratory fish should be able to return after decades of absence.
The site borders the Teesmouth and Cleveland Coast Special Protection Area and Ramsar site, which is also a Site of Special Scientific Interest. The estuary has lost an 90 per cent of its historic intertidal habitat, so restoring even a modest-looking stretch of marsh has significance well beyond the project boundary.
Part of a wider Tees programme
Greatham is one element of the £30 million Tees Tidelands Programme. That wider effort includes work near Port Clarence and Portrack, along the banks of the Tees and on tributaries including Lustrum Beck, Ormesby Beck and Billingham Beck. Its aim is to restore more than 50 hectares of estuarine habitat while helping homes, businesses and cope with climate change and rising sea levels.
Northumbrian Water contributed £2.086 million to the Greatham scheme, in part to examine how well the restored marsh captures nutrients. The Greatham Foundation provided the land, with BAM Nuttall, JBA Consulting and Turner & Townsend among the delivery partners. The project team also had to work around extreme weather, archaeological finds and nesting birds.
The physical construction may be finished, but the landscape will keep changing. The next phase includes sowing nine hectares of neutral grassland and planting 1.7 kilometres of species-rich native hedgerow, alongside further tree planting. It will take time for the marsh to settle and for wildlife to respond, which is exactly the point. This is restoration measured in seasons, not in a ribbon-cutting moment.
For a heavily industrialised estuary, the return of a daily tide to Greatham is a practical sign that industry, flood protection and nature do not always have to pull in opposite directions.