River Otter, Devon, United Kingdom
Project ended
Landscape level
The River Otter Beaver Trial (ROBT) represents the UK’s first licensed reintroduction of the Eurasian beaver (Castor fiber), a keystone species once extinct in Britain. Initiated in 2015 by Devon Wildlife Trust and partners, the project reintroduced several beaver families to restore natural river processes, improve water management, and enhance biodiversity. By 2020, beavers were granted permission to remain permanently after positive ecological and social outcomes demonstrated their role in reducing flood risk, improving water quality, and supporting community engagement in adaptive management.
Beavers became extinct in England in the 16th century due to hunting and habitat loss. Their absence led to simplified river systems prone to flash flooding and reduced wetland biodiversity. The River Otter catchment, historically modified for agriculture, experienced regular flood events and declining ecological health. Local support and adaptive governance enabled the reintroduction, which was an experimental effort to assess coexistence and nature-based flood management within a farmed landscape.
Beavers were reintroduced to the River Otter in 2015 to restore natural fluvial processes through dam-building and habitat modification. Their structures retain sediment and water, slowing flow and improving water storage during both flood and drought conditions. Over four years, 28 dams formed a network of ponds and wetlands, supporting a mosaic of biodiversity and delivering natural flood management benefits. Community co-management allowed proactive mitigation of localised farmland flooding through dam adjustments and “beaver deceivers.”
In 2015, several beaver (Castor fiber) families were reintroduced to the River Otter catchment in Devon under the River Otter Beaver Trial. The initial release was authorised by Natural England and operationally managed by the Devon Wildlife Trust, with additional logistical support from the University of Exeter and the RSPB. The intervention relied on re-establishing beavers as a keystone species to reinstate natural river processes through their dam-building and associated landscape modification in waterways and adjacent riparian areas.
Over the first four years, the two original beaver families constructed 28 dams across tributaries within the catchment and impounded almost two kilometres of river, creating a network of ponds, wetlands, and reservoirs. These structures were intended to slow water movement through the system, store water, trap sediment, and reduce downstream flood peaks. The dams and ditches formed by beaver activity also functioned to filter silt and chemicals, contributing to improved water quality.
Implementation required adaptive management to address localised impacts, particularly occasional flooding of agricultural land within the release site. This was handled through a community-involved approach in which local volunteers helped manage specific problem locations by lowering the height of selected dams and installing flow bypass devices to reduce unwanted inundation. Ongoing dialogue with surrounding communities and continued site monitoring supported this trial-and-error management approach, enabling adjustments when conflicts arose. Extensive monitoring accompanied the intervention, collecting data on biodiversity, water flows, and community impacts to track how beaver-driven changes influenced the landscape and to inform responsive mitigation actions.
Information not available yet.
