Blackmore River

Blackmore River flows into Darwin Harbour close to Darwin in the Northern Territory of Australia.[2]

Location of the Blackmore River mouth in the Northern Territory
TerritoryNorthern Territory
Physical characteristics
  locationWild Horse Plain, Australia
  elevation21 m (69 ft)
Darwin Harbour, Australia
12°38′27″S 130°57′03″E
0 m (0 ft)
Length25 km (16 mi)
Basin size848 km2 (327 sq mi)


The headwaters of the river rise at an elevation of 21 metres (69 ft) on the Wild Horse Plain and flow northwards past Tumbling Waters and through the Blackmore River Conservation Reserve. The river discharges into Darwin Harbour.

The Elizabeth River and Blackmore River catchments together occupy an area of 1,150 square kilometres (444 sq mi),[3] with the Blackmore catchment occupying 848 square kilometres (327 sq mi).

The estuary formed at the river mouth is tidal in nature and in near pristine condition.[4]


The climate of the Blackmore River region is monsoon tropical with two distinct seasons: the Dry and the Wet. The Dry lasts for 6 months between April and September with an average rainfall of 24 mm, whereas the Wet lasts between October and March with an average monthly rainfall of 254 mm/month (according to the Bureau of Meteorology, 1999). The majority of the rain falls between December and April. Runoff varies between 250–1000 mm.

Peak flow for the Blackmore River occurs in February with 605Ml/day, after which it slowly decreases until July when there is no freshwater input into Darwin Harbour until the onset of the following wet season (Padovan 1997). Cyclone frequency is low to moderate.[2]

Water quality

The water quality at the upper estuary and freshwater monitoring sites of the Department of Land Resource Management of the Northern Territory Government was 2011 in moderate condition.[5]


The underlying lithology is dominated by Permian siltstones and sandstones.[2]

See also


  1. "Map of Blackmore River, NT". Bonzle Digital Atlas of Australia. Retrieved 18 May 2015.
  2. N Smit, R Billyard and L Ferns: Beagle Gulf Benthic Survey: Characterisation of soft substrates. Archived 2012-03-28 at the Wayback Machine Technical Report No. 66 (2000), Parks and Wildlife Commission of the Northern Territory.
  3. "Elizabeth & Blackmore River Catchments - Flood Study" (PDF). Cardno. 11 April 2014. Archived from the original (PDF) on 19 May 2015. Retrieved 18 May 2015.
  4. "Australian Catchment, River and Estuary Assessment" (PDF). Natural Heritage Trust. 2002. Archived from the original (PDF) on 13 February 2014. Retrieved 19 May 2015.
  5. Blackmore River and Estuary Archived April 1, 2015, at the Wayback Machine
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