Riddoch Highway
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Riddoch Highway South Australia |
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| Riddoch Highway near Padthaway | |
| Type | Highway |
| Length | 239 km (149 mi) |
| Route number(s) |
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| North end |
 Dukes Highway, Keith, South Australia
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| South end | Cape Northumberland, Port MacDonnell, South Australia |
| Major settlements | Padthaway, Naracoorte, Coonawarra, Penola, Tarpeena, Mount Gambier |
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Highways in Australia National Highway • Freeways in Australia Highways in South Australia |
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A66
B66
B57 Bordertown-Naracoorte RoadThe 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.
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.
The Royal Automobile Association of South Australia has rated the highway at 5/10.
The Riddoch Highway is named after John Riddoch, the original landholder and vigneron in Coonawarra.
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Wikipedia