A large rockfall near Mount Aspiring has closed State Highway 6 south of Makarora until at least midday tomorrow.
NZ Transport Agency senior network manager John Jarvis said the 2000 cu m rockfall came down at 6am this morning about 15km south of Makarora.
The rockfall was roughly 50 metres long and 4-6m deep.
"We currently have a helicopter using a monsoon bucket to sluice away any remaining loose rock from the top of the rock fall site.
"This rock fall is larger than one two years ago about 100 metres further north."