Avon Gorge

Coordinates: 51°27′18″N 2°37′40″W / 51.4549°N 2.6279°W / 51.4549; -2.6279
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For the gorge in Scotland with the same name, see
Avon Gorge, Falkirk
.

River flowing though a steep sided valley. In the distance is a suspension bridge supported by towers. In the left foreground is a handrail.
The Avon Gorge and Clifton Suspension Bridge, looking south from the Downs

The Avon Gorge (

River Avon in Bristol, England. The gorge runs south to north through a limestone ridge 1.5 miles (2.4 km) west of Bristol city centre, and about 3 miles (5 km) from the mouth of the river at Avonmouth. The gorge forms the boundary between the unitary authorities of North Somerset
and Bristol, with the boundary running along the south bank. As Bristol was an important port, the gorge formed a defensive gateway to the city.

On the east of the gorge is the Bristol suburb of

observatory. The Clifton Suspension Bridge
, an icon of Bristol, crosses the gorge.

51°27′18″N 2°37′40″W / 51.4549°N 2.6279°W / 51.4549; -2.6279

Avon Gorge is located in Bristol
Avon Gorge
class=notpageimage|
Shown within Bristol and the UK

Geology and formation

River flowing through gorge with wooded sides. On the right hand bank is a road.
Looking north from the bridge, with Leigh Woods on the left and the Portway on the right.

The gorge cuts through a ridge mainly of limestone, with some sandstone. This particular ridge runs from Clifton to Clevedon, 10 miles (16 km) away on the Bristol Channel coast, although limestone is found throughout the Bristol area. The fossil shells and corals indicate that the limestone formed in shallow tropical seas in the Carboniferous, 350 million years ago.[1] For a long time it was unclear what caused the Avon to cut through the limestone ridge, rather than run southwest through the Ashton Vale towards Weston-super-Mare. However, Bristol was at the southern edge of glaciation during the Anglian ice age, and it has been suggested that ice blocked the river's natural route through Ashton Vale to the west.[2][3] At the Clifton Suspension Bridge the Gorge is more than 700 feet (213 m) wide and 300 feet (91 m) deep.[4]

In the 18th century the gorge was quarried to produce building stone for the city. Stone was taken by boat into the

habitat for Peregrine falcons
and other wildlife.

Ecology

Observatory
.

The steep walls of the gorge support some rare fauna and flora, including species unique to the gorge. There are a total of 24 rare plant species and two unique trees: the

autumn squill[10] and honewort.[11] Because of its steep sides, there are many parts of the gorge on which trees cannot grow, making way for smaller plants. The gorge is also home to rare invertebrate species.[9] The gorge has a microclimate around 1 degree warmer than the surrounding land.[2]
The steep south-west facing sides receive the afternoon sunlight, but are partially sheltered from the prevailing winds. When winds come from the Bristol Channel in the north west they may be funnelled into the gorge, creating harsh and wet conditions.

The steep gorge walls make an ideal habitat for

horseshoe bats, both of which find homes in the caves and bridge buttresses.[8]

Painting of river, with a sailing boat on it, with trees and grassy areas to the left
The Avon Gorge viewed from Ashton Meadow, by Francis Danby 1822

Due to its geology and ecology, an area of 155.4 hectares (384.0 acres) of the gorge and surrounding woodland has been protected as a

The Downs on the city side of the gorge are owned by Bristol City Council and managed as a large public park. The gorge side is protected in partnership with Bristol Zoo, WWF and English Nature.[9]
The council's management of the gorge involves balancing the need to protect its ecology with recreational uses such as rock climbing.

Spiked speedwell grows on both sides of the gorge: the first British record of this plant was from the gorge, in 1641.[21]

History of human use

St Vincent's Rocks, Avon Gorge, before the construction of the Suspension Bridge, c.1830s

The gorge area was inhabited at least as early as the

scheduled ancient monument.[23] A second hill fort was situated across Nightingale Valley, but has since been built on, and bridge road cuts through it. The third hill fort was situated on the opposite side of the gorge, in what is now observatory green. Archaeology, plus the configuration of the three forts, suggest they played a role in defending the gorge.[8]

Giants Cave
view point on the gorge face.

During the

Act of Parliament was passed to protect them as a park for the people of Bristol. In 1754 a bridge to span the gorge was proposed, but it was nearly 80 years before work began on Isambard Kingdom Brunel's Clifton Suspension Bridge, and a further 30 years before it was completed.[26][27]
Today the bridge is perhaps the best known landmark in Bristol.

Throughout Bristol's history the gorge has been an important transport route, carrying the River Avon, major roads and two railways. It is the gateway to Bristol Harbour, and provided protection against storms or attack. The Bristol Channel and Avon estuary have a very high tidal range of 15 metres (49 ft),[28] second only to Bay of Fundy in Eastern Canada;[29][30] and the gorge is relatively narrow and meandering, making it notoriously difficult to navigate. Several vessels have grounded in the gorge including the SS Demerara soon after her launch in 1851, the schooner Gipsy in 1878, the steam tug Black Eagle in 1861 and the Llandaff City.[31] The phrase "ship shape and Bristol fashion" arises from when the main harbour in Bristol was tidal, the bottom of which was rocky. If ships were not of stout construction then they would simply break up as the tide receded, hence the phrase.[32]

Stone tunnel with railway tracks emerging from it, surrounded by vegetation.
The Portishead Railway runs through a short tunnel under the bridge buttress.

A railway, the

A4 road, linking Bristol city centre to the M5 motorway, which bypasses the city near Avonmouth
. In the late 1990s the wide pavement through nearly all the Avon Gorge was designated to be legally usable by both cyclists and the fewer pedestrians.

Two railways still run through the gorge. On the east side the

Beeching Axe in the 1960s, but has since been reopened for freight traffic as far as Royal Portbury Dock, 2.5 miles (4 km) downstream,[33] and funding is now in place to reopen the rest of the line and reintroduce passenger services to Portishead.[34][35] Between 1893 and 1934, the Clifton Rocks Railway linked the passenger steamer pier at Hotwells with Clifton on the rim of the gorge.[36]

A footpath and National Cycle Network cycleway run alongside the Portishead Railway and along the old towpath.

The gorge's proximity to the urban population of Bristol made it a popular venue for rock climbing from the 1940s[37] – a time when most UK climbing was centred in mountain areas. The first guide to climbing routes in Avon Gorge was published in 1955 by the University of Bristol Mountaineering Club. The same year, British mountaineer Chris Bonington climbed Main Wall putting up Mercavity.[38] The 2017 edition of The Climbers' Club Guide to Avon Gorge by Martin Crocker[39] lists 400 pages of routes and guidance. Avon Gorge is often criticised as being so over-climbed many of the routes are "polished".[40]

Mythology

Sculpture of Goram the Giant in the grounds of Ashton Court

The formation of the Avon Gorge is the subject of mediaeval mythology. The myths tell tales of two giant brothers,

Blaise Castle estate, but consumed too much beer and fell asleep. Vincent dug the Avon Gorge and drained the lake, winning the affection of Avona. Upon waking Goram stamped his foot, creating "The Giant's Footprint" in the Blaise Castle estate, and threw himself into the Bristol Channel, turning to stone and leaving his head and shoulder above water as the islands of Flat Holm and Steep Holm.[41]

References

Notes

  1. ^ "Geology and biodiversitymaking the links" (PDF). English Nature. Archived from the original (PDF) on 19 March 2009. Retrieved 10 September 2008.
  2. ^ a b c River Avon Trail, 'Avon Gorge'. Accessed 5 May 2006.
  3. ISBN 978-1-4564-1631-7
    .
  4. ^ "Geology". Avon Gorge and Downs. Archived from the original on 18 September 2007. Retrieved 11 September 2008.
  5. ^ C.G. Down, 1968. "Paradise Bottom." The Industrial Railway Record No. 22 – p352-354
  6. JSTOR 1586914
    .
  7. ^ Hutton, Stanley (1907). Bristol and its famous associations. Bristol: J. W. Arrowsmith.
  8. ^ a b c BBC Bristol, "The Avon Gorge – Bristol's Great Glacier?" Accessed 5 May 2006.
  9. ^ a b c d Avon Wildlife Trust, "The wildlife and habitats of Avon Archived 12 July 2011 at the Wayback Machine." Accessed 24 March 2009.
  10. ^ a b Leivers, Mandy. "Discover the wildlife of the Avon Gorge & Downs". Bristol Zoo. Archived from the original on 19 March 2009. Retrieved 10 September 2008.
  11. ^ Myles (2000), page 161
  12. ^ "Woldlife and Geology". Avon Gorge and Downs. Archived from the original on 10 October 2008. Retrieved 11 September 2008.
  13. ^ Myles (2000) page 249
  14. ^ Myles (2000) page 251
  15. ^ Myles (2000) page 252
  16. ^ Myles (2000) page 68
  17. ^ Myles (2000), page 101
  18. ^ Myles (2000), page 102
  19. ^ Myles (2000), page 155
  20. ^ Myles (2000), page 156
  21. ^ Myles (2000), page 186
  22. ^ a b "Avon Gorge". BBC Bristol — Nature. BBC. Retrieved 10 September 2008.
  23. ^ "Stokeleigh Camp". Pastscape. English Nature. Retrieved 10 September 2008.
  24. ^ "The Downs". Environment — Parks and Open spaces. Bristol City Council. Archived from the original on 7 November 2009. Retrieved 29 November 2009.
  25. ISBN 0-7195-5748-8
    .
  26. ^ Beckett (1980). Chapter 6: "Bridges".
  27. ^ "Severn Estuary Barrage". UK Environment Agency. 31 May 2006. Archived from the original on 30 September 2007. Retrieved 3 September 2007.
  28. ISBN 0-8137-2370-1
    .
  29. ^ "Coast: Bristol Channel". BBC. Retrieved 27 August 2007.
  30. ^ "Wrecks on the River Avon". Bristol Radical History Group. Retrieved 3 March 2013.
  31. ^ Ship-shape and Bristol fashion on www.phrases.org.uk (retrieved 20 August 2007)
  32. ^ Portishead Railway Group, 2006. "History of the Portishead Railway Archived 7 October 2008 at the Wayback Machine." Accessed 15 April 2006
  33. ^ "Money for Portishead". Railfuture. 17 April 2019.
  34. ^ Wilson, Kate (26 June 2019). "Plans to reopen Bristol to Portishead railway ready to be submitted and line could open in 2023". Bristol Live.
  35. ^ "Clifton Rocks Railway — History". Subterranea Britannica. Archived from the original on 17 June 2007. Retrieved 3 June 2007.
  36. ^ "THE HISTORY OF CLIMBING IN THE AVON GORGE". Climb Bristol. Retrieved 14 March 2018.
  37. ^ Bonnington, Chris (1957). "Three Climbs at Avon" (PDF). Climbers Club Journal: 36–37.
  38. OCLC 1023538943
    .
  39. ^ "Gronk – My favourite route at Avon! | Dick's Climbing". www.dicksclimbing.com. Retrieved 14 March 2018.
  40. ^ Eugene Byrne & Simon Gurr, 2002. "Bristol Myths and Legends." Bristol 2008: St Vincent's Rock.

Bibliography

External links


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