Cumbria Beaver Group

There are three beaver enclosure sites in Cumbria: Lowther and two undisclosed locations. The Lowther enclosure project was established under licence in 2020.

The pair of beavers at Lowther Estate are in a private area to avoid disturbance, so open access to the public is not permitted.  

Beavers modify the habitats and landscapes in which they live. In the first instance, these changes can markedly alter the appearance of the local environment but research indicates a positive overall ecological functioning of catchments and river systems.

Beaver adaptations can bring enormous benefits to other species, including otters, water shrews, water voles, birds, invertebrates especially dragonflies, and breeding fish. Beavers naturally create and maintain diverse habitats providing catchment resilience and climate change adaptation. Their leaky dams can hold water in periods of drought, and can regulate flooding by slowing water flow. They can also improve water quality by holding silt behind dams and catching acidic and agricultural run-off. 

Beavers forage close to water with activity usually concentrated within 20m of the water’s edge. Beavers fell primarily broad-leafed trees and bushes, in order to eat the cambium (a thin layer between the bark and wood) during the winter and to construct their lodges and dams. Most coppiced trees will regenerate, diversifying the surrounding habitat structure. 

In some locations and circumstances, beavers require direct management intervention by people. A range of mitigation and management techniques are available such as installing overflow piping on dams to alter pool height, and wrapping trees in wire mesh to prevent gnawing. Beavers rarely eat conifers, although they can be felled by beavers as an emergency forage in rare instances,  and immature animals may attempt gnawing before quickly learning that they are unpalatable and unsuitable,  due to the tannins and sap present. Beavers generally do not live in water entirely surrounded by conifers. 

Impacts from burrowing on banks absent of trees, i.e. collapsed banks, are a factor on the Tay and have been cited by some anglers.

Evidence from Europe shows that shows that beaver damage is, in the vast majority of cases, small-scale, but they can forage crops close to rivers, cause bank erosion and collapse, and localised flooding. Beavers are not regarded as pests in Europe and where localised problems have occurred, there are a number of well-established methods in place. These include the removal of dams, the introduction of overflow piping, or the installation of fencing (as one does for deer and rabbits).

In general terms, beavers can actually help reduce the risk of flooding lower down in river systems by building dams and moderating water flow in smaller catchments. The modifications made to the streams can raise the water table locally, creating wetland areas to the benefit of biodiversity. Evidence from elsewhere in Europe shows that instances of beaver dams creating undesirable flooding are uncommon, localised and usually small-scale. In these situations, dams may be removed or flow devices are placed through them to manage water levels.

No. Beavers are herbivores. They eat woody plants and cambium from trees, aquatic plants, grasses and shrubs.

Beaver activities may have both positive and negative impacts on different fish species. Understanding the overall impact is complex. Beaver dams may act as barriers to migratory species such as salmon in some years and conditions, and cause localised siltation upstream of dams, affecting spawning habitat. On the other hand, positive impacts may include an increase in habitat variability for fish rearing and overwintering, an increase in refuge areas during high and low flow periods and an increase in aquatic invertebrate prey species. Furthermore, beaver dams can help improve water quality downstream of the dams, which can benefit fish. Read more about the potential impact on fish by the Scottish Wildlife Trust.

Research suggests that ponds and water pools created from beaver dams can have marked benefits on local water quality. The ponds can help to neutralise acidic run-off, act as sinks for pollutants and increase the self- purification of a watercourse. They can form considerable sediment traps, reducing very strongly erosive run-off and particulate loads in downstream water.

A Vertebrate Fauna of Lakeland by Macpherson, Rev. H. A., 1892, refers to a visit to the Cumberland Geological Society which indicates that beaver remains were found in the ‘Ressendale Valley’ (this is how Ravenstonedale was pronounced).

Beavers can carry host-specific parasites not currently present in Britain, though these are not known to infect or harm other species of wildlife, livestock or humans. Other parasites carried by beaver are already present in British wildlife, livestock and humans and these other sources of infection pose a more significant risk to water contamination than beavers. All beavers introduced to a site as part of a scientific trial are health screened. 

Licensed, free-living beavers first returned to the UK in 2009 with the Scottish Beaver Trial in Knapdale Forest, Argyll. In November 2016 the Scottish Government announced that the beavers could remain and expand naturally from Knapdale and a previously established population on the River Tay, marking their formal reintroduction in Scotland. In May 2019, Beavers were afforded legal protection as a European Protected Species by the Scottish Government.

A licensed, free-living beaver trial in England on the River Otter in Devon concluded in 2020, when the Government gave them permanent right to remain. 

In 2025 the UK Government announced that applications to return beavers into river catchments in England will be accepted. This paves the way for this native species to roam wild in British rivers and lakes once more, helping to create wetlands and increase biodiversity.