Bristol’s water supply. Site of Berkeley Castle's old duck decoy pond This is the site of the old decoy pond; the new one is due north east at Slimbridge Wildfowl and Wetlands Centre, and is maintained in full working order. Extract from The Book of Duck Decoys by Sir Ralph Payne Gallwey, 1886, ch7 p93 "...3 miles N. of the town of Berkeley, 12 miles SW. of Gloucester, and close to the south bank of the River Severn, within a mile E. of Purton. These are the only Decoys in the county. The pools, of which there are two within a mile of one another, are about an acre apiece in extent, and there are four pipes to each. The old pool is on the verge of the S. bank of the Berkeley and Gloucester Canal, which was formed so close to it that, fearing the Decoy would suffer therefrom, the new Decoy was constructed in 1840 between the canal and the Severn, on the New Grounds." References SSSI Source Natural England SSSI information on the citation Natural England SSSI information on the Purton Passage unit External links Friends of Purton website Natural England (SSSI information) Villages in Gloucestershire Stroud District