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The road between Makarora and Haast was closed yesterday after heavy rain, but was now under stop/go traffic management.
The New Zealand Transport Agency advised travellers that delays were expected and to take care while driving in the area.
Expensive road safety work was completed five years ago at the troublesome Diana Falls area.
An NZTA spokeswoman said a ''catch fence'' had done its job during the recent deluge on March 26, although it now needed to be emptied so it worked as designed.
The fence - capable of catching a 16-tonne boulder travelling at 90kmh - was part of $8 million of work done after a huge slip of 40,000cu m in September 2013.
The highway was closed for 11 days on that occasion and then at night for more than a year, causing economic hardship for towns from Hokitika to Wanaka, as tourists were forced to take another route.
MetService meteorologist Claire Nickson said by mid-afternoon yesterday, Milford Airport had received 129mm, Franz Josef Glacier 108mm and Haast 50mm of rain.
Further up the road, the West Coast Regional Council ended the deadlock over the south side of the Waiho (Waiau) River, agreeing to urgently rebuild a wall damaged in recent floods.
With no hint of government funding to relocate 80 or so residents south of the Waiho, the council agreed to immediately begin rebuilding the wall that was 80% destroyed by the March 26 flood.
Councillors backed a motion from Cr Birchfield to advance $250,000 immediately from the catastrophe fund, claim insurance and hire equipment on site.
A small delegation from Franz Josef travelled to the council meeting in Greymouth on Tuesday.
Chief executive Mike Meehan said the Waiho rating district had $100,000 in the bank, and it would claim insurance for the damaged stopbank.
Initial costings put the repairs at $2.6 million, with $3.7 million to extend it to Rata Knoll.
Mr Meehan said it was ''clear'' the Government would not be putting in compensation money to relocate landowners.
Rebuilding the wall would take about 13 weeks. Rock may be extracted from part of the Waiho Loop, which is road reserve.