Hilfield Park Reservoir is a 76.3 ha (189 acres) construction built in 1953 between

Bushey Bushey is a town in the Hertsmere borough of Hertfordshire in the East of England. It has a population of over 25,000 inhabitants. Bushey Heath is a large neighbourhood south east of Bushey on the boundary with the London Borough of Harrow ...

and

Elstree Elstree is a large village in the Hertsmere borough of Hertfordshire, England. It is about northwest of central London on the former A5 road, that follows the course of Watling Street. In 2011, its population was 5,110. It forms part of t ...

in Hertfordshire, and owned by

Affinity Water Affinity Water is a UK supplier of drinking water to 3.8 million people in parts of London, eastern and south eastern England. The company is owned by a consortium of Allianz, HICL and DIF Tamblin. Affinity Water was established through the pur ...

. Declared a Local Nature Reserve (LNR) in 1969, it is managed by the

Herts and Middlesex Wildlife Trust Herts and Middlesex Wildlife Trust manages over 40 nature reserves covering nearly north of London, in Hertfordshire and the historic county of Middlesex, part of which is divided between the London boroughs of Barnet, Enfield, Harrow and Hill ...

(HMWT). It is the oldest LNR in Hertfordshire. This large reservoir is home to a wide range of bird species. It is of national importance for pochards,

tufted duck The tufted duck or tufted pochard (''Aythya fuligula'') is a small diving duck with a population of close to one million birds, found in northern Eurasia. The scientific name is derived from Ancient Greek '' aithuia'', an unidentified seabird ment ...

s and

common tern The common tern (''Sterna hirundo'') is a seabird in the family Laridae. This bird has a circumpolar distribution, its four subspecies breeding in temperate and subarctic regions of Europe, Asia and North America. It is strongly migrator ...

, and it is also significant for mallards,

shoveller The shovelers or shovellers are four species of dabbling ducks with long, broad spatula-shaped beaks: * Red shoveler, ''Anas platalea'' * Cape shoveler, ''Anas smithii'' * Australasian shoveler, ''Anas rhynchotis'' * Northern shoveler, ''Anas c ...

s and

teal alt=American teal duck (male), Green-winged teal (male) Teal is a greenish-blue colour. Its name comes from that of a bird — the Eurasian teal (''Anas crecca'') — which presents a similarly coloured stripe on its head. The word is oft ...

. The margins have marshy areas with many breeding birds and marsh plants, such as

reedmace ''Typha'' is a genus of about 30 species of monocotyledonous flowering plants in the family Typhaceae. These plants have a variety of common names, in British English as bulrush or reedmace, in American English as reed, cattail, or punks, in ...

and reed canarygrass. In 2011 an eastern crowned warbler was caught and ringed, only the second to be found in Britain. The site is kept locked and access is restricted to HMWT members.

References

{{coord, 51.6491, -0.3276, type:landmark_region:GB-BNE, display=title Local Nature Reserves in Hertfordshire Herts and Middlesex Wildlife Trust reserves Aldenham