Since 1986 the Society has taken over the management of a former sludge lagoon which was used by British Waterways to dump the dredgings from the River Weaver Navigation but is no longer active. Situated on the SE bank of the river it covers 11.6 Ha (28.7 acres) of mixed habitat; open water, reedbed and scrub with the River Weaver to one side and a substantial mixed woodland on the other. It is this diversity of habitats which makes the area interesting from a natural history point of view. The open water of the lagoon hosts a variety of wildfowl and water birds with breeding Little Grebe, Mallard and Coot while in winter Gadwall, Teal, Tufted Duck and Pochard are regular visitors as are Kingfisher and Grey Heron. The reedbed hosts a good population of Reed Warblers while the woodland and scrub areas are good for Willow Warbler, Chiffchaff and other warblers. Marsh Tit were once regular breeders, even using the nest boxes, but as in many places they have declined with only the occasional sighting now. There is also a good variety of woodland plants with the spring display of Bluebells being particularly fine.

At present there is no access to the reserve due to work being carried out by the water company to renew the main pipes which carry water from Lake Vyrnwy to Liverpool and pass alongside the reserve entrance and under the river though hopefully this will change soon.