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Location United Kingdom, South West
Central coordinates 2o 37.24' West  51o 20.06' North
IBA criteria B1i, C3
Area 574 ha
Altitude 60 m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description One of the largest freshwater bodies in south-west England, supporting a sparse open-water plant community, this large artificial reservoir supports breeding wetland species and attracts wintering and passage wildfowl. The IBA also includes areas of managed pasture.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Shoveler Spatula clypeata winter  2001-2006  514 individuals  good  B1i, C3  Least Concern 

IBA Monitoring

2007 low favourable low
Good - based on reliable and complete / representative data

No known threats no known threats happening now small area/few individuals (<10%) no or imperceptible deterioration low

Spatula clypeata Northern Shoveler 420 514 individuals 100 favourable

Whole area of site (>90%) covered by appropriate conservation designation  Unknown  Unknown  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Chew Valley Lake Site of Special Scientific Interest 576 is identical to site 574  
Mendip Hills Area of Outstanding Natural Beauty 19,800 protected area contains site 574  


IUCN habitat Habitat detail Extent (% of site)
Forest Mixed woodland  -
Grassland Mesophile grasslands; Steppes and dry calcareous grassland  -
Wetlands (inland) Standing freshwater; Water fringe vegetation  -

Land use

Land-use Extent (% of site)
tourism/recreation -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Chew Valley. Downloaded from on 28/10/2016

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