State Highway 3 remains closed through Taranaki's Awakino Gorge following a large mudslide yesterday afternoon

Contractors are assessing the road, and clearing debris.

Crews are also clearing a number of smaller slips on the highway, between Tongaporutu and Piopio, which came down during heavy rain overnight.

MetService forecaster Thapi Makgabutlane says rain's also been causing some surface flooding in Porirua.