Riddoch Highway
Highway in South Australia
title: "Riddoch Highway" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["highways-in-south-australia", "roads-in-south-australia"] description: "Highway in South Australia" topic_path: "geography/australia" source: "https://en.wikipedia.org/wiki/Riddoch_Highway" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Highway in South Australia ::
::data[format=table title="Infobox Australian road"]
| Field | Value |
|---|---|
| type | highway |
| road_name | Riddoch Highway |
| state | sa |
| image | Riddoch_Highway_SA.jpg |
| caption | The Riddoch Highway near Padthaway |
| length | 239 |
| length_ref | |
| route | {{plainlist |
| direction_a | North |
| direction_b | South |
| coordinates_a | |
| coordinates_b | |
| pushpin_label_position_a | left |
| pushpin_label_position_b | left |
| end_a | Dukes Highway |
| Keith, South Australia | |
| end_b | Sea Parade |
| Port MacDonnell, South Australia | |
| exits | {{plainlist |
| region | Limestone Coast |
| through | , |
| :: |
| type = highway | road_name = Riddoch Highway | state = sa | image = Riddoch_Highway_SA.jpg | caption = The Riddoch Highway near Padthaway | length = 239 | length_ref = | est = | route = {{plainlist|
- A66 (1998–present) (Keith–Mount Gambier)
- B66 (1998–present) (Mount Gambier–Port MacDonnell) | direction_a = North | direction_b = South | coordinates_a = | coordinates_b = | pushpin_label_position_a = left | pushpin_label_position_b = left | end_a = Dukes Highway Keith, South Australia | end_b = Sea Parade Port MacDonnell, South Australia | exits = {{plainlist|
- Bordertown–Naracoorte Road
- Wimmera Highway
- Edenhope-Penola Road
- Princes Highway}} | region = Limestone Coast | through = , Riddoch Highway is a rural highway in south-eastern South Australia, designated as route A66 between Keith and Mount Gambier, with the remainder between Mount Gambier and Port MacDonnell designated as route B66. It is named after John Riddoch, the first white settler landholder and vigneron in Coonawarra.
Route
The Riddoch Highway 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.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.
Safety
The Royal Automobile Association of South Australia has rated the highway at 5/10.
Major intersections
|LGA-DC=Tatiara |location=Keith |type=trans |km=0.0 |road= Dukes Highway (A8), Melbourne |notes=Northern terminus of highway and route A66 |LGA-Co=Naracoorte Lucindale |LGAspan=2 |location=The Gap |km=83.5 |road= Bordertown–Naracoorte Road (B57) |notes= |location=Naracoorte |km=109 |road= Wimmera Highway (C240), |notes=Continues into VIC as route B240 along Wimmera Highway eventually to Marong |LGA-Co=Wattle Range |LGAspan=2 |location_special=Glenroy |km=141 |road= Edenhope Road (C212) |notes=Continues into VIC as route C212 along Edenhope-Penola Road eventually to Edenhope |location=Penola |km=159 |road= Casterton Road (C198) |notes=Continues into VIC as route C198 along Casterton-Penola Road eventually to Casterton |LGAC=Mount Gambier |location=Mount Gambier |type=trans |km=210 |road= Princes Highway (A1 east, B1 west), |notes=Route transition: A66 north, B66 south |LGADC=Grant |location=Port MacDonnell |type=trans |km=238 |road=Sea Parade – Cape Northumberland |notes=Southern terminus of highway and route B66
References
References
- "Riddoch Highway".
- "Location SA Map viewer with regional layers". [[Government of South Australia]].
- (2011). "Unearthing viticulture in the Limestone Coast".
- (September 2006). "roadwatch report – riddoch highway". [[Royal Automobile Association.
- "Location SA Map viewer with LGA layers". [[Government of South Australia]].
- "Location SA Map viewer with suburb layers". [[Government of South Australia]].
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