Riddoch Highway

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Riddoch Highway
South Australia
Riddoch Highway SA.jpg
Riddoch Highway near Padthaway
General information
Type Highway
Length 239 km (149 mi)
Route number(s)
  • A66
  • (Keith - Mount Gambier)
  • B66
  • (Mount Gambier - Port MacDonnell)
Major junctions
North end Dukes Highway, Keith, South Australia
South end Cape Northumberland, Port MacDonnell, South Australia
Major settlements Padthaway, Naracoorte, Coonawarra, Penola, Tarpeena, Mount Gambier
Highway system
The Riddoch Highway connects Keith, Naracoorte, Mount Gambier and Port MacDonnell in southeastern South Australia.

The Riddoch Highway in south-eastern South Australia branches from the Dukes Highway at Keith and travels south through Padthaway, Naracoorte, Penola, Nangwarry, Tarpeena, and Mount Gambier to Port MacDonnell and nearby Cape Northumberland.[1]

The highway has been designated as State Route A66 between Keith and Mount Gambier. The remainder, between Mount Gambier and Port MacDonnell has been labelled State Route B66, although this is not officially known as the Riddoch Highway.

It passes through grazing and cereal-growing land, horticultural and vineyards (within the following wine regions - Padthaway, Wrattonbully, Coonawarra and Mount Gambier), and plantation timber, predominantly pinus radiata.[2]

The Royal Automobile Association of South Australia has rated the highway at 5/10.[3]

The Riddoch Highway is named after John Riddoch, the first white settler landholder and vigneron in Coonawarra.

Major intersections

LGA Location km[4] mi Destinations Notes
Tatiara Keith 0.0 0.0 Dukes Highway (National A8) – Adelaide, Melbourne
Naracoorte Lucindale The Gap, Cadgee, Lochaber, Keppoch 83.5 51.9 Bordertown-Naracoorte Road
Naracoorte 109 68 Wimmera Highway (C240) –Hynam, Edenhope
Wattle Range Glenroy 141 88 Edenhope-Penola Road (C212) – Edenhope, Victoria
Wattle Range Penola 159 99 Casterton Road (C198) – Casterton, Victoria, Melbourne
Mount Gambier Mount Gambier 210 130 / Princes HighwayPortland, Victoria, Millicent, Kingston SE
Grant Port MacDonnell 238 148 Cape Northumberland
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

Australia road sign W5-29.svg Australian Roads portal


  1. ^ "Naming of State Rural Roads South East (RACK PLAN 994)" (PDF). Department of Planning, Transport and Infrastructure. Retrieved 18 November 2014. 
  2. ^ Longbottom, Mardi; Maschmedt, David and Pichler, Markus (2011), Unearthing viticulture in the Limestone Coast (PDF), p. 12, ISBN 978-0-646-56744-0, archived from the original (PDF) on 6 November 2014, retrieved 5 November 2014 
  3. ^ "roadwatch report – riddoch highway" (PDF). RAA. September 2006. Retrieved 2007-10-16. 
  4. ^ Google (6 February 2018). "Riddoch Highway" (Map). Google Maps. Google. Retrieved 6 February 2018. 

External links

  • Riddoch Highway webpage on Ozroads website

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