Watch: Coromandel's SH25A wiped out by extreme weather

Footage of State Highway 25A in the Coromandel shows part of the road has been completely decimated by extreme weather that hit the region over the weekend.

From the video, it appears an entire section of the road has fallen down the side of a hill, leaving a chasm between the other side.

Both lanes have disappeared - all that remains is the safety barrier, which hangs over the weather-made canyon.

On Monday, Waka Kotahi NZTA issued a statement regarding SH25A saying: "SH25A in the Coromandel will be closed for quite some time. Plans are being worked on for a longer-term solution, but that solution will require drier warmer weather."

Waka Kotahi's David Spears said the road is fixable, but how long it will be out of action for is a question of time and resources.

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"It will be a very large job to restore the road to function.

"At this stage, the site is still quite dynamic, still moving — until it dries out and stops moving, it's virtually impossible for the geotech engineers to get in and work out what kind of basement we've got left to start building from."

He said Waka Kotahi is in a very good position regarding SH25A, saying contractors are working as hard as they can to get the road cleared.

"Our geotec engineers are some of the best in the world to deal with this," he said.

Spears said the next step is to assess the extent of the slip and figure out how they are going to repair it.

Emergency Management Minister Kieran McAnulty travelled up to the site earlier today and called it "extraordinary".

"We saw the pictures, and we knew it was a big deal, but for that to double in size in one day and for it still to be moving, we're talking about an event which is going to cause massive disruption to the region, and it's gonna take a long time to fix."

A number of roads across the North Island have been closed due to severe damage caused by flooding and heavy rain.