The Turnford and Cheshunt Pits is a biological Site of Special Scientific Interest near

Cheshunt Cheshunt ( ) is a town in Hertfordshire, England, north of London on the River Lea and Lee Navigation. It contains a section of the Lee Valley Park, including much of the River Lee Country Park. To the north lies Broxbourne and Wormley, ...

in Hertfordshire and

Essex Essex () is a county in the East of England. One of the home counties, it borders Suffolk and Cambridgeshire to the north, the North Sea to the east, Hertfordshire to the west, Kent across the estuary of the River Thames to the south, and Grea ...

and covers a total of 428.17 acres (173.28 ha).English nature-Turnford & Cheshunt Pits
Retrieved 9 September 2008 It is part of the Lee Valley

Special Protection Area A Special Protection Area (SPA) is a designation under the European Union Directive on the Conservation of Wild Birds. Under the Directive, Member States of the European Union (EU) have a duty to safeguard the habitats of migratory birds and certa ...

Location

North Met Pit, Cheshunt Gravel Pits - geograph

Most of the site is owned by

Lee Valley Regional Park Authority Lee Valley Regional Park Authority (LVRPA) is a statutory body that is responsible for managing and developing the long, Lee Valley Regional Park. The park was established by Parliament of the United Kingdom in 1967. The headquarters of the ...

and managed as the

River Lee Country Park The River Lee Country Park is located in the Lee Valley Park and is managed by the Lee Valley Regional Park Authority. Covering on either side of the River Lee Navigation between Waltham Abbey and Broxbourne, it is an area of lakes, watercours ...

. The site is bounded to the west by

and Turnford and Fishers Green and Holyfield to the east.

Description

The SSSI includes ten former gravel pits, part of the Small River Lea, a further waterbody, Hall Marsh Scrape, which was constructed specifically for use by waterfowl. Also included in the site are areas of

marsh A marsh is a wetland that is dominated by herbaceous rather than woody plant species.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p Marshes can often be found a ...

grassland A grassland is an area where the vegetation is dominated by grasses ( Poaceae). However, sedge ( Cyperaceae) and rush ( Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur na ...

, ruderal herbs, scrubland and

woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the ''plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (se ...

. The pits which include North Metropolitan Pit known as Northmetpit was excavated in the 1940s to Hooks Marsh Lake which was dug in the 1970s and cover a span of over 40 years. The site are of national importance for the wintering gadwall and the wintering

northern shoveler The northern shoveler (; ''Spatula clypeata''), known simply in Britain as the shoveler, is a common and widespread duck. It breeds in northern areas of Europe and across the Palearctic and across most of North America, wintering in southern E ...

and of regional importance for wintering

coot Coots are medium-sized water birds that are members of the rail family, Rallidae. They constitute the genus ''Fulica'', the name being the Latin term for "coot". Coots have predominantly black plumage, and—unlike many rails—they are usually ...

and locally important for wintering

snipe A snipe is any of about 26 wading bird species in three genera in the family Scolopacidae. They are characterized by a very long, slender bill, eyes placed high on the head, and cryptic/ camouflaging plumage. The ''Gallinago'' snipes have a ...

and the

bittern Bitterns are birds belonging to the subfamily Botaurinae of the heron family Ardeidae. Bitterns tend to be shorter-necked and more secretive than other members of the family. They were called ''hæferblæte'' in Old English; the word "bittern ...

. Breeding bird species of local importance include the

great crested grebe The great crested grebe (''Podiceps cristatus'') is a member of the grebe family of water birds noted for its elaborate mating display. Taxonomy The great crested grebe was formally described by the Swedish naturalist Carl Linnaeus in 1758 in t ...

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 ...

, coot,

little ringed plover The little ringed plover (''Charadrius dubius'') is a small plover. The genus name ''Charadrius'' is a Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate. It derives from Ancient Greek ''kharadrios'' a bird found in river ...

sedge warbler The sedge warbler (''Acrocephalus schoenobaenus'') is an Old World warbler in the genus '' Acrocephalus''. It is a medium-sized warbler with a brown, streaked back and wings and a distinct pale supercilium. Sedge warblers are migratory, crossing ...

and the

reed warbler The ''Acrocephalus'' warblers are small, insectivorous passerine birds belonging to the genus ''Acrocephalus''. Formerly in the paraphyletic Old World warbler assemblage, they are now separated as the namesake of the marsh and tree warbler f ...

. Many species of aquatic

invertebrates Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordat ...

have been recorded from the site especially damselflies and

dragonflies A dragonfly is a flying insect belonging to the infraorder Anisoptera below the order Odonata. About 3,000 extant species of true dragonfly are known. Most are tropical, with fewer species in temperate regions. Loss of wetland habitat threa ...

including the scarce hairy dragonfly which has bred on the site and the red eyed damselfly is found in abundance. The various pits support varied aquatic and marinal

flora Flora is all the plant life present in a particular region or time, generally the naturally occurring (indigenous (ecology), indigenous) native plant, native plants. Sometimes bacteria and fungi are also referred to as flora, as in the terms '' ...

including the nationally scarce

whorled water milfoil ''Myriophyllum verticillatum'', the whorl-leaf watermilfoil or whorled water-milfoil, is a native to much of North America, North Africa, and Eurasia. It closely resembles another native milfoil, called northern water milfoil (''M. sibiricum'' ...

. Other species include the fan-leaved water-crowfoot,

flowering rush ''Butomus'' is the only known genus in the plant family Butomaceae, native to Europe and Asia. It is considered invasive in some parts of the United States. Taxonomy The Butomaceae family has been recognized by most taxonomists as a plant ...

, lesser reedmace, frogbit, blunt-leaved pondweed, lesser pondweed and the brown sedge. Many of the spits and islands have developed into areas of scrubland and woodland mostly of

willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist so ...

species and

alder Alders are trees comprising the genus ''Alnus'' in the birch family Betulaceae. The genus comprises about 35 species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few sp ...

. To the west of the North Metropolitan pit is the Nightingale Wood. This large block of woodland provides roosting and feeding sites for wintering and migratory

passerine A passerine () is any bird of the order Passeriformes (; from Latin 'sparrow' and '-shaped'), which includes more than half of all bird species. Sometimes known as perching birds, passerines are distinguished from other orders of birds by th ...

birds. The nationally scarce musk beetle aromia moschata is also present in these areas. Several pits have developed marsh and rank

, their principal value is for invertebrates, particularly an area close to Bowyer's Water where grasshoppers and

bush-cricket Insects in the family Tettigoniidae are commonly called katydids (especially in North America), or bush crickets. They have previously been known as "long-horned grasshoppers". More than 8,000 species are known. Part of the suborder Ensifera, t ...

s are present. This

orthopteran Orthoptera () is an order of insects that comprises the grasshoppers, locusts, and crickets, including closely related insects, such as the bush crickets or katydids and wētā. The order is subdivided into two suborders: Caelifera – grassho ...

fauna is believed to be the richest in Hertfordshire and includes several species more associated with coastal sites, such as the lesser marsh grasshopper and the nationally scarce roesel's bush-cricket. Small River Lea

Several areas of former gravel pit have been infilled with

power station A power station, also referred to as a power plant and sometimes generating station or generating plant, is an industrial facility for the generation of electric power. Power stations are generally connected to an electrical grid. Many ...

pulverised fuel ash, much of which was transported to the site by barge via the

River Lee Navigation The Lee Navigation is a canalised river incorporating the River Lea (also called the River Lee along the sections that are navigable). It flows from Hertford Castle Weir to the River Thames at Bow Creek; its first lock is Hertford Lock and its ...

. Much of the reclaimed land is poorly drained and exerts a strong

calcareous Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines. In zoology ''Calcareous'' is used as an ad ...

influence on the vegetation. The area supports some of the largest colonies of marsh orchid in Essex and Hertfordshire. Other orchids present in large numbers are the early marsh orchid and

southern marsh orchid ''Dactylorhiza praetermissa'', the southern marsh orchid or leopard marsh orchid, is a commonly occurring species of European orchid. Description ''Dactylorhiza praetermissa'' grows to tall, with leaves generally unspotted. The flowers, appea ...

, also present in smaller numbers are the

common spotted orchid ''Dactylorhiza fuchsii'', the common spotted orchid, is a species of flowering plant in the orchid family Orchidaceae. ''Dactylorhiza fuchsii'' is one of Europe's commonest wild orchids. It is widespread across much of Europe, with the range ...

and various hybrids between these species. To the north of the site at Turnford Pit North, are a number of small areas of grassland believed to represent relics of the habitat which preceded gravel extraction. These fragments of agriculturally unimproved grassland are of a dry, rather calcareous, type which is rarely found in a river valley. Plant species which are present here include the cowslip,

wild carrot ''Daucus carota'', whose common names include wild carrot, European wild carrot, bird's nest, bishop's lace, and Queen Anne's lace (North America), is a flowering plant in the family Apiaceae. It is native to temperate regions of the Old World ...

and the common centaury. The site also supports a wide range of

mammals Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur o ...

, reptiles and amphibians: including otter, harvest mice and a large population of

grass snake The grass snake (''Natrix natrix''), sometimes called the ringed snake or water snake, is a Eurasian non-venomous colubrid snake. It is often found near water and feeds almost exclusively on amphibians. Subspecies Many subspecies are recognized ...

Public access

The nearest station is Cheshunt railway station. Car parking is available adjacent to the site. Cycling and pedestrian access via the

Lea Valley Walk The Lea Valley Walk is a long-distance path located between Leagrave, the source of the River Lea near Luton, and the Thames, at Limehouse Basin, Limehouse, east London. From its source much of the walk is rural. At Hertford the path follows t ...

. Much of the site can be visited by the network of public footpaths and cycle tracks.Walking routes
Retrieved 11 September 2008

References

External links

Walking routes
{{SSSIs Hertfordshire Sites of Special Scientific Interest in Hertfordshire Sites of Special Scientific Interest in Essex Sites of Special Scientific Interest notified in 1995 Lee Valley Park Hoddesdon Epping Forest District

Location

Description

Public access

See also

References

External links