Riddoch Highway is a rural highway in south-eastern
South Australia
South Australia (commonly abbreviated as SA) is a States and territories of Australia, state in the southern central part of Australia. With a total land area of , it is the fourth-largest of Australia's states and territories by area, which in ...
, 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
Dukes Highway is a 190 kilometre highway corridor in South Australia, which is part of the link between the Australian cities of Adelaide and Melbourne. It is part of the National Highway system spanning Australia, and is signed as route A8.
R ...
at
Keith and travels south through
Padthaway,
Naracoorte,
Penola,
Nangwarry,
Tarpeena, and
Mount Gambier
Mount Gambier is the second most populated city in South Australia, with a population of 25,591 as of the 2021 census. The city is located on the slopes of Mount Gambier (volcano), Mount Gambier, a volcano in the south east of the state, about ...
to
Port MacDonnell and nearby
Cape Northumberland.
It passes through
grazing
In agriculture, grazing is a method of animal husbandry whereby domestic livestock are allowed outdoors to free range (roam around) and consume wild vegetations in order to feed conversion ratio, convert the otherwise indigestible (by human diges ...
and
cereal
A cereal is a grass cultivated for its edible grain. Cereals are the world's largest crops, and are therefore staple foods. They include rice, wheat, rye, oats, barley, millet, and maize ( Corn). Edible grains from other plant families, ...
-growing land,
horticultural
Horticulture (from ) is the art and science of growing fruits, vegetables, flowers, trees, shrubs and ornamental plants. Horticulture is commonly associated with the more professional and technical aspects of plant cultivation on a smaller and mo ...
and
vineyards
A vineyard ( , ) is a plantation of grape-bearing vines. Many vineyards exist for winemaking; others for the production of raisins, table grapes, and non-alcoholic grape juice. The science, practice and study of vineyard production is kno ...
(within the following wine regions –
Padthaway,
Wrattonbully,
Coonawarra and
Mount Gambier
Mount Gambier is the second most populated city in South Australia, with a population of 25,591 as of the 2021 census. The city is located on the slopes of Mount Gambier (volcano), Mount Gambier, a volcano in the south east of the state, about ...
), and
plantation timber, predominantly
pinus radiata
''Pinus radiata'' ( syn. ''Pinus insignis''), the Monterey pine, insignis pine or radiata pine, is a species of pine native to the Central Coast of California and Mexico (on Guadalupe Island and Cedros island). It is an evergreen conifer in t ...
.
Safety
The
Royal Automobile Association of South Australia has rated the highway at 5/10.
Major intersections
See also
*
Highways in Australia
*
List of highways in South Australia
References
External links
Riddoch Highway webpage on Ozroads website
{{Road infrastructure in South Australia
Highways in South Australia
Roads in South Australia