Thomson River (Victoria)
A bridge over the Thomson River, pictured in 1910.
|Etymology||In honour of Sir Edward Thomson|
|Region||South East Coastal Plain (IBRA), West Gippsland|
|Local government area||Shire of Wellington|
|Source||Baw Baw Plateau, Great Dividing Range|
|- location||near Newlands|
|- elevation||972 m (3,189 ft)|
|Mouth||confluence with the Latrobe River|
|2 m (6 ft 7 in)|
|Length||170 km (110 mi)|
|River system||West Gippsland catchment|
|- left||Matlock Creek, Jordan River, Aberfeldy River, Stringers Creek, Lammers Creek, Stoney Creek, Macalister River|
Location and features
The Thomson River rises below Newlands at the north western end of the Baw Baw Plateau of the Great Dividing Range, where it shares a watershed with the Yarra and Tanjil rivers. From its source, the river flows generally north, then east, then south southeast through its impoundment, then southeast, then east, and finally east by south, joined by seventeen tributaries including the Jordan, Aberfeldy, and Macalister rivers, before reaching its confluence with the Latrobe River near Sale. The river descends 970 metres (3,180 ft) over its 170-kilometre (110 mi) course.
The Thomson Valley was intensively mined for gold during the latter half of the 19th and early 20th centuries. Prospector "Ned" Stringer discovered significant quantities of alluvial gold at the junction of what is now known as Stringers Creek. A short distance up that creek the gold mining township of Walhalla was established. The first person to walk the entire length of the river was Ronald Le Sage, father of David Le Sage, who explored its viability for a cattle droving route in 1959.
The river is impounded not far below its source by the Thomson Dam, creating Thomson Reservoir. The reservoir provides around 70% of Melbourne's water storage and supplies about 30% of Melbourne's water needs. This takes about 50% of the river's natural flow, which places a great environmental stress downstream. It particularly affects the Gippsland Lakes, which include Lake Wellington, Lake Victoria and Lake King. This area has international significance as a Ramsar listed wetland site.
The 170-metre (560 ft) Victorian heritage-listed diversion tunnel is located on the river near its junction with Coopers Creek (and the locality of Platina), approximately 4 kilometres (2.5 mi) south-west of Walhalla. Tunnelling commenced in August 1911 and was completed around October 1912; making the diversion tunnel one of thirteen river diversions surviving from the Victorian gold rush.
- "Thomson River: 27701: Traditional Name: Tambo". Vicnames. Government of Victoria. 12 August 2011. Archived from the original on 22 February 2014. Retrieved 9 February 2014.
- "Thomson River: 27701: Traditional name: Carrang-carrang". Vicnames. Government of Victoria. 12 May 2011. Archived from the original on 22 February 2014. Retrieved 9 February 2014.
- "Thomson River: 27701: Traditional name: Carrang-carran". Vicnames. Government of Victoria. 12 May 2011. Archived from the original on 22 February 2014. Retrieved 9 February 2014.
- Blake, Les (1977). Place names of Victoria. Adelaide: Rigby. p. 198. ISBN 0-7270-0250-3.
- "Thomson River: 27701: Historical Information". Vicnames. Government of Victoria. 24 January 2014. Archived from the original on 22 February 2014. Retrieved 9 February 2014.
- "Map of Thomson River, VIC". Bonzle Digital Atlas of Australia. Retrieved 9 February 2014.
- West Gippsland Catchment Management Authority; Department of Sustainability and Environment; Melbourne Water Corporation; Southern Rural Water (September 2003). "Thomson River Environmental Flow Requirements and Options to Manage Flow Stress" (PDF). Archived from the original (PDF) on 1 March 2011. Retrieved 8 February 2011.
- Premier of Victoria (24 October 2010). "All Water Returned to the Yarra and Thomson Rivers" (Press release). Archived from the original on 19 February 2011. Retrieved 8 February 2011.
- Environment Victoria - Thomson River
- "Thomson River Diversion Tunnel, Victorian Heritage Register (VHR) Number H1990, Heritage Overlay Number HO261". Victorian Heritage Database. Heritage Victoria. Retrieved 13 September 2010.