Heavy rain falling in Westland is again bringing rock and gravel down on to State Highway 6 at Diana Falls, closing the highway to all traffic from Haast to Makarora.
The NZ Transport Agency's Performance Manager Pete Connors says rain has been steadily falling in the area since early this morning, closing the road at 1.30pm.
"We will review the situation again at 9am tomorrow (Thursday 3 October)."
With the rain and waterfalls running across the slip face, he says more rock and gravel is being washed on to the highway making it unsafe for motorists to drive through the area.
"Our contractors will be on site at first light tomorrow to check what has come down overnight and whether we will be able to re-open the highway."
Mr Connors warned heavy rain was again forecast for Friday and as a result, motorists were advised there could be further disruptions.
"The slip which happened earlier last month has yet to stabilise which means there is continued uncertainty with access along this section of State Highway 6 when there is heavy rain in the area."
