Deep River (Western Australia)
Fernhook Falls on the Deep River
|Length||120 kilometres (75 mi)|
|Source elevation||183 metres (600 ft)|
|Avg. discharge||172,000 ML/year |
|Basin area||100 km2 |
The river is under tidal influence for the last 6 kilometres (4 mi) of its length.
Although generally shallow the Deep River has depths of up to 6.5 metres (21 ft) in places. The Deep River is one of the few perennial rivers in Western Australia although 80% of its discharge occurs in winter and spring.
The rivers water quality is very good, fresh and low in nutrients. The majority of the catchment of the Deep River is not cleared. The silt and clay content can be high during the winter period. The Deep River begins just west of Lake Muir about 50 km from the coast on the edge of the Yilgarn Plateau. It flows through a valley between granite hills then wanders across the coastal plain finally entering the Nornalup Inlet on the western side.
Some features of the river include wide unobstructed pools interspersed with rapids such as Rowell’s Pool and two waterfalls, Fernhook Falls and Gladstone Falls. 
Originally sighted in 1831 by Captaian Thomas Bannister, he river was not named until 1841 by the Colonial Secretary, Peter Brown. It had been known as the Frankland River by sealers that operated in the area. The explorer W.N. Clark named it West River on his charts but Brown later decided on the current name.
- "Bonzle Digital Atlas - Map of Deep River, WA". 2008. Retrieved 23 November 2008.
- "South Coast Rivercare - Deep River". 2007. Retrieved 17 June 2007.[dead link]
- "Walpole Nornalup Indicative Management Plan". 2006. Retrieved 11 June 2007.
- "Walpole Wilderness Proposal". 1998. Retrieved 9 August 2009.
- Western Australian Land Information Authority. "History of river names". Retrieved 3 September 2011.
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