|Gwydir River (Guida)|
|Big Bundarra River, Bundara River, Big River, Rocky River|
|Major perennial river|
Gwydir River, near Bingara
|Name origin: In honour of Lord Gwydir|
|State||New South Wales|
|Districts||New England, North West Slopes, Orana|
|Municipalities||Uralla, Gwydir, Moree Plains, Walgett|
|Part of||Barwon River, Murray–Darling basin|
|- left||Horton River|
|- right||Moredun Creek|
|Primary source||Rocky River|
|- location||at Yarrowyck, near Uralla|
|- elevation||760 m (2,493 ft)|
|Secondary source||Boorolong Creek|
|Source confluence||Mehi River|
|- location||near Moree|
|- elevation||202 m (663 ft)|
|Mouth||confluence with the Barwon River|
|- location||north east of Collarenebri|
|- elevation||144 m (472 ft)|
|Length||488 km (303 mi)|
|Basin||26,588 km2 (10,266 sq mi)|
|Reservoirs||Lake Copeton, Collymongle Lagoon|
Gwydir River //, a major inland perennial river of the Barwon catchment within the Murray-Darling basin, is located in the Northern Tablelands, North West Slopes, and Orana districts of New South Wales, Australia.
The river rises at the junction of the Rocky River and Boorolong Creek, at Yarrowyck, northwest of Uralla and flows generally northwest and west, joined by over thirty-four tributaries, including the Horton and Mehi rivers, before reaching its confluence with the Barwon River, north east of Collarenebri; descending 616 metres (2,021 ft) over its 488 kilometres (303 mi) course.
The flow of the river is impounded by Copeton Dam, with storage used for town water supply, stock, domestic use and irrigation. The Gwydir River below Copeton Dam provides some of the wildest whitewater rafting available in Australia. Before the construction of Copeton Dam and much diversionary work, the Gwydir River flowed into the Gingham and Lower Gwydir Wetlands.
The Gwydir Highway was named after the river.
The Gwydir river rises on the southern part of the Northern Tablelands, near the town of Uralla, and flows about 668 km (415 mi) generally north west and then west onto the plains where it branches somewhat, eventually joining the Barwon River, mostly as its main branch the Mehi River, which branches off to the east of Moree, before passing though it. The upper Gwydir River also passes the towns of Bundarra, Bingara, Gravesend, and Pallamallawa. Further tributaries above Moree are the Carole/GilGil Creeks to the north that flow into the Barwon River when during times of high rainfall/runoff.
The Gwydir River further splits into two anabranches west of Moree - the Lower Gwydir or "Big Leather Watercourse" is the southern channel, and the "Gingham Channel" is the northern branch. The Gingham Channel flows west, joining the Ballone Creek before it flows into the Big Leather Watercourse. The Big Leather Watercourse then joins the Mehi River to the south. In turn, the Mehi River joins the Barwon River near the town of Collarenebri.
Over its entire distance, the Gwydir River falls around 616 metres (2,021 ft) in elevation from its headwaters, at an elevation of 760 metres (2,490 ft) above sea level to when it joins the Barwon River at an elevation of 144 metres (472 ft) above sea level. The Gwydir River's total length is 488 kilometres (303 mi), in which space and thirty-four tributaries feed into it over its entire length; including the Horton River, Warialda Creek, Laura Creek and Moredun Creek.
Explorer Allan Cunningham crossed the river at Gravesend in 1827 and named it after his patron, Lord Gwydir, who took his title from Gwydir Castle in Wales. The Commonwealth Electoral Division of Gwydir, which was created in 1901 and ceased to exist at the 2007 federal election, was named for the Gwydir River. In Australia the name is pronounced as // to rhyme with "wider," whereas the Welsh name is pronounced roughly "Gwidd-eer."
The iron lattice bridges crossing the Gwydir River at Bundarra and Bingara are regarded as significant bridges of the colonial period. Around mid-1838 a war of extirpation, according to local magistrate Edmund Denny Day, was waged all along the Gwydir River. Aborigines in the district were repeatedly pursued by parties of mounted and armed stockmen and Day claimed that great numbers of them had been killed at various spots.
A lot of irrigated cotton is grown near Moree, as well as many other crops, livestock and agricultural enterprises. The cotton industry relies on irrigation and has been affected by recent drought with water allocations to farms severely reduced. In 2006 it was calculated that the cotton industry consumed 87% of the agricultural water taken from the Gwydir River.
Irrigation in the upper Gwydir led to a severe reduction in environmental flows downstream. The reduction in water flow has affected landholders who traditionally used waters from the river to supplement stock drinking water and for minor watering of pasture and small areas of crops. It also stopped periodical flushes of water into ephemeral creeks, watercourses and wetlands in the more remote off-river properties. These conflicts resulted in the establishment of the Gwydir Regulated River Management Committee in 1997 and a management plan which came into effect on 1 July 2004.
Some 1,021 square kilometres (394 sq mi) of the Gwydir Wetlands have been identified by BirdLife International as an Important Bird Area because, when they receive adequate water inflows, they support more breeding waterbirds than any other site in the country. At times more than half a million nesting waterbirds have been present, including over 1% of the world populations of Nankeen Night Herons, Intermediate Egrets, and of White and Straw-necked Ibises. The endangered Australasian Bittern has been recorded.
- "Gwydir River". Geographical Names Register (GNR) of NSW. Geographical Names Board of New South Wales. Retrieved 6 February 2013.
- "Map of Gwydir River (1)". Bonzle.com. Retrieved 6 February 2013.
- "Map of Gwydir River (2)". Bonzle.com. Retrieved 6 February 2013.
- "Map of Gwydir River (3)". Bonzle.com. Retrieved 6 February 2013.
- "Map of Gwydir River (4)". Bonzle.com. Retrieved 6 February 2013.
- "Landscape - carbon, nutrients, water and productivity - Gwydir River". Australian Natural Resource Atlas. Retrieved 30 April 2008.
- Wilkinson, Marian (16 August 2008). "Cotton sucking life out of Murray". The Sydney Morning Herald. Retrieved 30 June 2009.
- Pigram, John J. (2007). Australia's Water Resources: From use to management. Collingwood, Victoria: CSIRO Publishing. pp. 138—139. ISBN 978-0-643-09442-0.
- "The Annotated Ramsar List: Australia". The Ramsar Convention on Wetlands. 4 January 2000. Retrieved 29 March 2010.
- "IBA: Gwydir Wetlands". Birdata. Birds Australia. Retrieved 5 July 2011.
- Threatened Species of the New England Tablelands & NW Slopes of NSW. NSW National Parks & Wildlife Service. 2003. ISBN 0-7313-6673-5.
- "Gwydir River catchment" (map). Office of Environment and Heritage. Government of New South Wales.
- Origin of the name "Gwydir"