The road to the main weir and Burke and wills campsite at Mindee lakes Nsware a very corrugated road for app 6 or 8 km's.

But worth going there as its a nice spot and can relax by the Darling river and ever see pelicans on the river.

I have been to Minindee lakes now 3 times in the last 6 years, doing app 15 to 20 kmh on corrugated road you still get shaked around a bit, not sure how often it is graded?

http://www.exploreaustralia.net.au/New-South-Wales/Outback/Menindee-Lakes/Burke-and-Wills-Campsite