A long gravel run through rugged backcountry, linking the St Arnaud and Nelson Lakes area with the Hanmer Springs side. Originally built to service the transmission lines, it crosses Rainbow Station's private land before reaching the Molesworth boundary. The northern end is steeper, with the road hugging river valleys, while it opens out near Lake Tennyson and the southern stretch.

Mostly well-graded gravel with optional river and stream fords, and bridges if you'd rather keep dry. Expect potholes on the southern section and rocky, loose going up north, where airing down helps. Crossings can rise after heavy rain. Most vehicles cope fine, and folks have done the lot in 2WD on a good day. The scenery is the drawcard: alpine peaks, native bush and quiet valleys with spots to fish or pull over for lunch. The camping near Lake Tennyson is well worth it.

Access is $60 per vehicle, paid in cash at the homestead near the northern end, where they often sell local honey too, so carry extra. Gates open 7am to 6pm. No fuel or services along the way, so bring water, food and insect repellent for the sandflies at the camps. Leave gates as found and take your rubbish out.