|Length||81 kilometres (50 mi)|
|Source elevation||249 metres (817 ft)|
|Mouth elevation||146 metres (479 ft)|
|Avg. discharge||17,800,000 cubic metres (23,300,000 cu yd) per annum|
|Basin area||16,800 square kilometres (6,487 sq mi)|
The headwaters of the river rise near Belmunging then flow in a northerly direction crossing the Goldfields Road and continuing in a north-westerly direction to finally flow parallel to the Northam York Road and crossing Great Eastern Highway. The river discharges into the Avon River, of which it is a tributary, just west of Northam.
There are three tributaries of the Mortlock River; Mortlock River North, Mortlock River East and Meenaar South Creek.
The river is saline and delivers the most salt (approximately 91 tonnes per year) into the Avon River.
- "Bonzle Digital Atlas – Map of Mortlock River". 2009. Retrieved 6 March 2009.
- "Avon River Basin Natural Resource Management Plan" (PDF). 2004. Retrieved 6 March 2009.[dead link]
- Western Australian Land Information Authority. "History of river names – M". Retrieved 1 September 2011.
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