Diversions are in place at the Puketona roundabout (the intersection with SH10) and at Haruru Falls Rd.
Light vehicles travelling from Paihia will be able to U-turn at Haruru Falls Rd intersection.
Heavy vehicles will need to travel via Haruru Falls Rd, through Waitangi, to return to Paihia.
Police warned drivers to expect travel delays.
An NZTA spokesperson said traffic would be detoured via State Highway 11 from Kawakawa. Motorists were advised to check the NZTA Journey Planner website (journeys.nzta.govt.nz) for up-to-date information on the closure before they travel.