Floodbrook Clough is an Ancient Semi-Natural Woodland and Site of Special Scientific Interest located in the Beechwood area of Runcorn. It is a mixed broadleaved woodland in a long, deep steep-sided clough with Flood Brook running through the bottom. It has been relatively undisturbed due to the steep slopes and is one of the best examples in Cheshire of clough woodland on keuper marl. It has rich assemblages of wet woodland plants including two nationally rare species (thin spiked wood sedge and wood barley). There is no public access allowed and footpaths in the wood due to sheer cliff faces and unfavourable wet ground conditions, however it can be viewed from a public footpath that runs around the outside of the wood.