|Name origin: Henry Mortlock Ommanney, a surveyor|
|Part of||Avon River|
|- location||near Belmunging|
|- elevation||249 m (817 ft)|
|- location||west of Northam|
|- elevation||146 m (479 ft)|
|Length||81 km (50 mi)|
|Basin||16,800 km2 (6,487 sq mi)|
|- average||17,800,000 m3/s (628,601,068 cu ft/s)|
Course and features
The headwaters of the river rise near Belmunging then flow in a northerly direction, crossed by the Goldfields Road and continuing in a north-westerly direction to finally flow parallel to the Northam York Road and crossed by the Great Eastern Highway. The river is joined by three minor tributaries; Mortlock River North, Mortlock River East and Meenaar South Creek. The river discharges into the Avon River, just west of Northam. The Mortlock descends 103 metres (338 ft) over its 81-kilometre (50 mi) course.
The river is saline and delivers the most salt (approximately 91 tonnes (90 long tons) per year) into the Avon River.
- "Map of Mortlock River, WA". Bonzle Digital Atlas of Australia. Retrieved 18 September 2015.
- "Avon River Basin Natural Resource Management Plan" (PDF). 2004. Retrieved 6 March 2009.[dead link]
- Western Australian Land Information Authority. "History of river names". Archived from the original on 16 February 2015. Retrieved 1 September 2011.
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