|Unitary Authority||East Anglia|
|SAC EU Code||UK0012647|
|Status||Designated Special Area of Conservation (SAC)|
|* This is the approximate central point of the SAC. In the case of large, linear or composite sites, this may not represent the location where a feature occurs within the SAC.|
General site character
Inland water bodies (Standing water, Running water) (42%)
Bogs, Marshes, Water fringed vegetation, Fens (12%)
Humid grassland, Mesophile grassland (40%)
Broad-leaved deciduous woodland (6%)
Download the Standard Data Form for this site as submitted to Europe (PDF <100kb)
Note When undertaking an appropriate assessment of impacts at a site, all features of European importance (both primary and non-primary) need to be considered.
Annex I habitats that are a primary reason for selection of this site
3260 Water courses of plain to montane levels with the Ranunculion fluitantis and Callitricho-Batrachion vegetation
The Wensum represents sub-type 1 in lowland eastern England. Although the river is extensively regulated by weirs, Ranunculus vegetation occurs sporadically throughout much of the river’s length. Stream water-crowfoot R. penicillatus ssp. pseudofluitans is the dominant Ranunculus species but thread-leaved water-crowfoot R. trichophyllus and fan-leaved water-crowfoot R. circinatus also occur.
Annex I habitats present as a qualifying feature, but not a primary reason for selection of this site
- Not Applicable
Annex II species that are a primary reason for selection of this site
1092 White-clawed (or Atlantic stream) crayfish Austropotamobius pallipes
The Wensum is a chalk-fed river in eastern England, and is an eastern example of riverine white-clawed crayfish Austropotamobius pallipes populations. As with most of the remaining crayfish populations in the south and east of England, the threats from non-native crayfish species and crayfish plague are severe. Designation of the river as a SAC provides as much protection as can be afforded to such vulnerable populations.
Annex II species present as a qualifying feature, but not a primary reason for site selection
Many designated sites are on private land: the listing of a site in these pages does not imply any right of public access.