Castlereagh River

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Castlereagh River
Mostly perennial river[1]
Castlereagh R.JPG
The river seen from the Castlereagh Highway, south of Walgett
Name origin: in honour of Lord Castlereagh[1]
Country Australia
State New South Wales
Regions IBRA: Brigalow Belt South, Darling Riverine Plains
Districts Central West, Orana
Municipalities Warrumbungle, Coonamble, Walgett
Towns and Settlements Coonabarabran, Binnaway, Mendooran
Gilgandra, Gulargambone, Coonamble
Source Warrumbungles
 - location west of Coonabarabran
 - elevation 630 m (2,067 ft)
Mouth confluence with the Macquarie River
 - location west of Walgett
 - elevation 121 m (397 ft)
Length 541 km (336 mi)

Castlereagh River, a mostly perennial river[1] that is part of the Macquarie catchment within the Murray–Darling basin, is located in the central–western district of New South Wales, Australia.

The river rises in the heart of the Warrumbungle mountains and initially flows east through the town of Coonabarabran. It then follows a looping course to the south, west, and finally northwest, joined by 26 minor tributaries, towards its confluence with the Macquarie River; dropping 509 metres (1,670 ft) over its course of 541 kilometres (336 mi).[2] The Castlereagh River has a highly variable flow, and often, low to no flow.[3]

From upstream towards downstream, the Castlereagh River flows through or near the towns of Coonabarabran, Binnaway, Mendooran, Gilgandra and Coonamble.

The Castlereagh River is partly a subterranean river.[citation needed] When there is no water on the surface of the river there is always a stream of water running underground.


Aboriginal history[edit]

European history[edit]

The Castlereagh River was discovered in 1818 by George Evans and explored by John Oxley,[4] who named the river in honour of Lord Castlereagh the same year.[1]

In January 2010, major flooding along the river inundated more than 400 rural properties.[5] Fodder drops were needed and some livestock had to be moved.

See also[edit]


  1. ^ a b c d "Castlereagh River". Geographical Names Register (GNR) of NSW. Geographical Names Board of New South Wales. Retrieved 18 January 2013. 
  2. ^ a b "Map of Castlereagh River". Retrieved 18 January 2013. 
  3. ^ "Macquarie–Castlereagh". Explore the Basin. Murray-Darling Basin Authority. 2008. Retrieved 18 January 2013. 
  4. ^ "Search for the Inland Sea". Exploration. State Library of New South Wales. 2005. Archived from the original on 26 June 2006. Retrieved 13 July 2006. 
  5. ^ "New South Wales in 2010: La Niña brings wettest year in half a century". Annual Climate Summary for New South Wales. Bureau of Meteorology. 4 January 2011. Retrieved 26 September 2011. 

External links[edit]

Coordinates: 30°12′S 147°32′E / 30.200°S 147.533°E / -30.200; 147.533