A partial road closure remains in place on a Bay of Plenty highway.

State Highway 30 has been plagued with slips and road washouts following recent heavy rain events.

"Due to significant underslips, a partial road closure remains in place as geotechnical investigations are completed," says the latest update from Waka Kotahi NZ Transport Agency.

"Currently, SH30 is closed to westbound traffic between SH34 (Kawerau) and SH30 (Tikitere). A detour via Matata and Paengaroa is required.

"Eastbound traffic may still travel this section of SH30 with caution "

Image: Waka Kotahi NZ Transport Agency.

Alternative route: Westbound traffic detour from SH30, to SH34, to SH2, to SH33 and back on to SH30.

The partial road closure is expected to be in place until further notice.