Although rain is easing off in Mid and South Canterbury, it's unlikely some key roads including State Highway 1 will reopen today, Waka Kotahi says.
With rain lessening further south of Christchurch, flood waters on roads were expected to recede in those areas later today, journey manager Waka Kotahi NZ Transport Agency Tresca Forrester said.
However, Selwyn / Waikirikiri river had caused deep flooding on SH1 at Dunsandel which meant the highway link south of Christchurch was among the roads unlikely to open today.
"In North Canterbury rain is continuing and we have a number of areas we need to assess, for example SH73, Porter's Pass to the West Coast, which will remain closed.
"Engineers are assessing the two Kowai River bridges and Porter River bridge approaches on SH73 today, and there is a lot of river shingle covering this highway which needs to be shifted before it can reopen.
"The Lewis Pass via Waipara, SH7, the other route linking Canterbury and the West Coast, is open."
UPDATE 1:05PM— Waka Kotahi NZTA Canterbury & West Coast (@WakaKotahiCWC) May 31, 2021
SH73 Darfield to Springfield is OPEN. Aviod travel as there are seven other closures on SH1 Temuka to Hinds, SH1 Burnham to Dunsandel, SH73 Springfield to Castle Hill, SH75 Little River, SH77 Darfield to Winchmore, SH79 Fairlie to Rangitata & SH8 Fairlie to Tekapo. pic.twitter.com/s0nG3VGnzT
She urged people to avoid travel in Canterbury today given the changing situation. People should check Waka Kotahi's South Island Facebook page before heading out, she said.
"Many local roads are also under water, so your local council's Facebook pages and Emergency Management pages are the best places to check."
A summary of closed highways in Canterbury as at lunchtime today:
- SH73 Darfield to Castle Hill - slips, flooding, bridge approaches washed out in three places
- SH77, the inland route Darfield to the Rakaia Gorge - slips and flooding
- SH75 the Akaroa highway - closed from Barrys Bay to Birdlings Flat
- SH1, south of Christchurch - closed at the Selwyn River/ Waikirikiri, Dunsandel where water is a metre deep over the road at this point and not dropping currently
- SH1 closed several places from Mid to south Canterbury - Hinds to Temuka, water is 600mm deep north of the Hinds River bridge
- SH77 Methven to Windwhistle and Darfield - the inland scenic route - closed due to flooding several places
- SH79 Rangitata to Fairlie and Geraldine - road flooded in several places
- SH8 Fairlie to Tekapo via Burkes Pass, closed due to flooding.
People were urged not to drive through floodwaters even if they were subsiding as they could have hidden hazards.
The Timaru District Council Civil Defence said receding floodwaters could scour part of the road away, leaving holes behind.
Mid-Canterbury Federated Farmers president David Clark said he had already witnessed several road rescues.
Clark said people should stay off the roads unless it was absolutely necessary.
Mid-Canterbury dairy farmer Brian Beeston whose business partner had to be rescued by helicopter yesterday said the floodwaters had created chaos.
Beeston runs 1200 cows on two dairy farms in Ashburton.
He said yesterday morning his business partner was trying to shift stock when a raging torrent washed him a kilometre downstream.
He spent three hours clinging to a tree in the floodwaters before he was rescued and taken to hospital, where he was treated for hypothermia.
Beeston said they had lost stock in the floodwaters and it would be three or four days before they knew the full extent of the damage.