|Region||South Eastern Highlands (IBRA), Central Victoria|
|Local government area||Yarra Ranges Shire|
|Source||Yarra Ranges, Great Dividing Range|
|⁃ location||below Mount Vinegar|
|⁃ elevation||865 m (2,838 ft)|
|Mouth||confluence with the Yarra River|
|south of Healesville|
|77 m (253 ft)|
|Length||29 km (18 mi)|
|River system||Port Phillip and Western Port catchment|
|⁃ right||Meyers Creek|
Location and features
The Watts River rises below Mount Vinegar within the Yarra Ranges, a part of the Great Dividing Range, within the Watts River Reference Area, near the settlement of Somers Park, north east of Healesville. The river flows generally south, then northwest, then southwest where it is impounded by the Maroondah Dam to create the 22,000-megalitre (780×106 cu ft) Maroondah Reservoir. After flowing over the dam spillway, the river flows generally west by south, joined by the Meyers Creek, before reaching its confluence with the Yarra River south of Healesville. The river descends 788 metres (2,585 ft) over its 29 kilometres (18 mi) course.
The river became part of Melbourne's water supply system in 1891, with the construction of a diversion weir and the Maroondah Aqueduct. At that time, the catchments were closed and cleared of human habitation. The river was dammed in 1927 to form Maroondah Reservoir. It is largely contained in the forested reservoir catchment within the Yarra Ranges National Park.
- "Watts River: 29030: Traditional name: Broong-ku-galk". Vicnames. Government of Victoria. 12 August 2011. Retrieved 9 March 2014.
- "Watts River: 29030". Vicnames. Government of Victoria. 2 May 1966. Retrieved 9 March 2014.
- "Map of Watts River, VIC". Bonzle Digital Atlas of Australia. Retrieved 9 March 2014.
- Ritchie, E. G. (October 1934). "Melbourne's Water Supply Undertaking". Journal of Institution of Engineers Australia. 6: 379–382. Archived from the original (PDF) on 5 April 2011.
- "Port Phillip and Westernport Regional River Health Strategy". Melbourne Water and Port Phillip and Westernport Catchment Management Authority. Retrieved 14 September 2010.
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