Grawin Opalmania

There's an opal field called Grawin way out back of Lightning Ridge,
It's hard to get to at the moment as there never was a bridge
'Cross the flooded Barwon River where the floodwaters still flow,
Eighteen months it been now, and the locals still don't know
When the Camborah road will open so they can get to town,
It's getting pretty tedious going the long way round.