A slip has closed one lane of State Highway 29 Lower Kaimai Range.
Motorists have been asked to take special care when travelling on the highway.
With heavy rain continuing to fall road closures and travel restrictions were likely to remain in place for some time, New Zealand Transport Agency said.
Regional Performance manager Mark Owens said the agency was keeping a close eye on conditions.
"Our contractors are constantly monitoring road and weather conditions so they can quickly respond to flooding, slips and rock falls," he said.
