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((Short description|Estuary in Cornwall, England))
((Use dmy dates|date=November 2019))
((more citations needed|date=September 2015))
((Infobox body of water
| name = Hayle Estuary
| native_name =((native name|kw|Heyl))
| image = File:The Hayle Estuary - geograph.org.uk - 579594.jpg
| alt = A tidal estuary at low water
| caption = Looking towards Lelant from the causeway
| pushpin_map = Cornwall
| pushpin_map_alt = A map of Cornwall, England with a mark indicating the location of Hayle Estuary
| pushpin_label_position = right
| pushpin_map_caption = Location in Cornwall
| image_bathymetry = 
| alt_bathymetry = 
| caption_bathymetry = 
| location = [[Hayle]], [[Cornwall]]
| coordinates = ((coord|50.192|-5.435|type:landmark_region:GB|display=inline,title))
| type = 
| inflow = 
| rivers = Angarrack and [[River Hayle|Hayle]]
| outflow = [[St Ives Bay]]
| catchment = 
| basin_countries = 
| agency = 
| designation = Site of Special Scientific Interest (SSSI)
| length = 
| width = 
| area = 
| depth = 
| max-depth = 
| volume = 
| residence_time = 
| salinity = 
| shore = 
| elevation = 
| frozen = 
| islands = 
| sections = 
| islands_category = 
| trenches = 
| benches = 
| cities = 
| website = 
| reference = 
))

[[File:Hayle Towans from Lelant Towans - geograph.org.uk - 580477.jpg|thumb|Hayle Towans from Lelant Towans]]
The '''Hayle Estuary''' (((lang-kw|'''Heyl''')), meaning ''estuary'') is an [[estuary]] in west [[Cornwall]], England, United Kingdom. It is one of the few natural harbours on the north coast of south-west England and during the prehistoric and [[Early Middle Ages|early medieval]] periods was important for trade and the movement of people and ideas.

The estuary of the [[River Hayle]] consists of a main channel, with several other nearby tidal areas, including Lelant Saltings, Copperhouse Creek (((lang-kw|Est Logh)), meaning ''eastern inlet'') and Carnsew Pool (also known as Carnsew Basin). It is included in the [[Hayle Estuary and Carrack Gladden SSSI|Hayle Estuary and Carrack Gladden]] [[Site of Special Scientific Interest]]. The [[Royal Society for the Protection of Birds]] manages a [[nature reserve]] at the site.

==History==
Due to the estuary being one of the few natural harbours on the north coast of south-west England, it was important for trade and the movement of people and ideas. A hillfort, overlooks the estuary at Carnsew, and dates from the later prehistoric period. Prehistoric artifacts with Irish connections have been found around the estuary, and in the early medieval period some of the earliest post-Roman evidence for Christianity in Cornwall, which also had strong Irish influences.  Set into the lower slope of the hillfort is an early-Christian memorial stone known as the ″Cunaide Stone″, which was discovered in 1843. Research on the inscription suggests it dates to the 5th-century AD, has European inspiration and the name is possibly Irish in origin. Religion and trade continued during the early medieval period with pilgrimages to [[St Michael's Mount]] and European shrines, but trade declined during the later medieval period when the estuary became choked by silt due to tin extraction up river.((sfnp|Historic England|1006720|ps=))

The Cornish Copper Company moved to Hayle in 1757 and built a copper smelting works the following year on the eastern part of the estuary, on what is now known as Copperhouse Pool. Access to the open sea was difficult and one of the earliest surviving industrial buildings in Hayle. a canal and dock, was completed in 1769. Harvey's Foundry was established in 1779 at the head of Penpol Creek by John Harvey to serve local mines. Harvey's built South Quay in 1819 which increased silting in shipping channels; a problem initially resolved by impounding Copperhouse Pool. Carnsew Pool was created in 1834 to impound tidal water, following the building of East Quay by the Cornish Copper Company, which caused the deep water channels used by Harvey's to fill with silt. The sides of Carnsew Pool are built of rubble and slag, and New Pier was also built, to direct water through sluices, into the estuary; thus flushing silt out of the river channel adjacent to Harvey's foundry. The complex system maintained the port facilities which allowed the two competing foundries to increase their national and international roles. As well as building [[Beam engine|steam engines]], Harvey's developed their business with overseas exports, shipbuilding and ship-breaking. Harvey's fleet of 79 ships built at Hayle including the 4000 ton SS ''Ramleh'' in 1891; the largest ship to be built in Cornwall.((sfnp|Historic England|1160051|ps=))((sfnp|Historic England|1402648|ps=))

The two rival companies were responsible for the development of Hayle into a major industrial port in the 18th and 19th-centuries, servicing the tin and copper mining industry of West Cornwall.((sfnp|Historic England|1327613|ps=)) About 1811, Sea Lane (or Black Road) was built across Copperhouse Creek to further improve access between the works at Copperhouse and the company's main shipping facilities at North Quay. The buildings around the creek was mostly built from blocks of slag, called scoria; waste material from the smelter, providing a distinctive building material. Hence the name ″Black Road″.((sfnp|Historic England|1327613|ps=))((sfnp|Historic England|1143687|ps=))

===Transport===
In 1825 an [[Act of Parliament]] established the ''Hayle Bridge Causeway and Turnpike Trust'' which was required to construct a bridge, causeway and [[turnpike trust|turnpike]] over the Hayle River from Griggs Quay (((gbmapping|SW545363))) in the west to [[Phillack]] in the east. The turnpike was needed to ease the transport of [[copper ore]] to the port at Hayle for export. A second Act was passed in 1837 to establish the ''Griggs Quay to Penzance Turnpike'' and in 1839 an Act formed a third trust, the ''Hayle and Redruth Turnpike'' to complete the turnpike to [[Redruth]].((sfnp|Historic England|1405965|ps=)) The running of the turnpike was overseen by the winner of a public auction. For the year 1880, the winning bid was £591&nbsp;10s.<ref>((cite news|last1=Cornish|first1=Thomas|title=Hayle Bridge Causeway and Turnpike Road|work=The Cornishman|issue=115|date=23 September 1880|page=1))</ref> In 1885 the management of the causeway by the turnpike came to an end and the White house ([[tollhouse]]) on the eastern end, along with the garden and three granite posts was put up for auction on 30 October 1885.<ref>((cite news |title=Hayle Bridge Causeway and Turnpike Trust |work=The Cornishman |issue=379 |date=22 October 1885 |page=1))</ref>

The [[Hayle Railway]] was built in the 1830s, as a single-track for the movement of minerals from the mines at [[Camborne]] and [[Redruth]]. Its western terminal was at Penpol (under the viaduct of the current railway), followed part of the northern shore of Copperhouse Pool and then via an inclined plane at [[Angarrack]], on to [[Redruth]].((sfnp|Historic England|1143706|ps=))

==See also==
((Portal|Cornwall))
* [[Port of Hayle]]
* [[Hayle]]
* [[St Ives Bay]]

==References==
((Reflist))

===Sources===
((Refbegin))
* ((NHLE |num= 1006720|desc= Small multivallate hillfort, early Christian memorial stone and C19 landscaped paths at Carnsew| accessdate=12 October 2019|mode=cs2))
* ((NHLE |num= 1327613|desc= Copperhouse Dock| accessdate=13 October 2019|mode=cs2))
* ((NHLE |num= 1143687|desc= Black Bridge| accessdate=15 October 2019|mode=cs2))
* ((NHLE |num= 1405965|desc= Milestone standing at the entrance to the depot of Mounts Bay Coaches, at NGR SW4851231161| accessdate=12 October 2019|mode=cs2))
* ((NHLE |num= 1160051|desc= Carnsew Quay| accessdate=12 October 2019|mode=cs2))
* ((NHLE |num= 1402648|desc= Late C18-C19 mill complex, ropeworks and associated water management system immediately east of Millpond Avenue, Foundry | accessdate=15 October 2019|mode=cs2))
* ((NHLE |num= 1143706|desc= Former Railway Bridge over Copperhouse Creek at NGR SW566382| accessdate=15 October 2019|mode=cs2))

((Refend))

==External links==
((Commons category))
* [http://hayle.co.uk/attractions/estuary/ More information and images for Hayle Estuary]

((Cornwall|state=collapsed))

[[Category:Hayle]]
[[Category:Environment of Cornwall]]
[[Category:Landforms of Cornwall]]
[[Category:Nature reserves in Cornwall]]
[[Category:Royal Society for the Protection of Birds reserves in England]]
[[Category:Estuaries of England]]
[[Category:Cornish coast]]

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