There are FOUR separate articles on this webpage about the history of the River Avon with a mini-menu visible to users viewing the Desktop version of this website.
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The name Avon is derived from an ancient Celtic word 'Afon' which simply means 'river' . There are five rivers in England named 'Avon', three in Scotland and one in Wales.
The most famous of the English Avons is probably that associated with Stratford upon Avon in Warwickshire. That example may have influenced the choice of names for roads constructed here in Stratford sub Castle during the 20th century - Shakespeare Road, Verona Road, Capulet Road, Warwick Close - as part of new housing developments.
There are two sources for the Salisbury Avon, one near Pewsey, some 30 miles north of Stratford sub Castle and a second east of Devizes. They merge at Upavon and continue on a 60 mile journey passing close to the Stonehenge Landscape, then flowing between the Woodford and Durnford valleys before passing to the west of Stratford sub Castle, on through the centre of Salisbury towards Hampshire and ultimately, Christchurch Harbour and the English Channel. Much of its length is designated a Site of Special Scientific Interest (SSSI). The Salisbury Avon has more species of fish than any other British river .
All the significant direct and indirect tributaries of the Avon, including the Nadder, Wylye, Bourne & Ebble converge within a short distance around Salisbury. 
The Avon at Stratford Bridge
 SSSIs in and around Stratford sub Castle
Maps - Google Maps Accessed 17/1/21
From the Woodford Road, two channels of the Avon flow south with the water meadows patterns between them [WM]. That on the west passing under the Avon bridge is wiggly, the more easterly passing under Stratford Bridge is straight.
The straighter line to the east is manmade, it is the mill leat, running at a higher level (head) than the western channel, which we cannot say has never been altered by man but is the more natural river course.
Aerial Image Google Earth
[WM] Details of the local water meadows are here
©Wiltshire Museum, Devizes
The footbridge at the end of Mill Lane, with Avonside in the trees
This view is at least 100 years old (pre-1923). The wooden bridge predates the current one. Avonside (late 18th C) is clad in foliage with no building to its east. There is a flat-capped boatman near the east bank. There was a ford on the upstream side of the bridge. The slope down the west bank is still visible today. There are now more trees along the path west of the bridge.
'Ebb & Flow' is a video produced by Wessex Archaeology for the Council for British Archaeology (CBA)
Festival of Archaeology in 2020.
(This was a virtual Festival due to Covid-19 restrictions.)
With a theme 'Climate and Environment', the video records a discussion between Geoarchaeologist Claire Mellett and Artist James Aldridge as they walk alongside the River Avon from the outskirts of Stratford sub Castle into and then through, Salisbury. [WA]
Click the image to view the Wessex Archaeology webpage for more information and to access this and other related videos.
Other relevant webpages on the stratfordsubcastle.org.uk website