"Diversions are in place, motorists are asked to please avoid the area and delay travel if possible."
Motorist Kelly Stuart was caught up in the backlog of traffic. She arrived at the scene about 10 minutes after it happened but headed back to Turangi via the National Park.
Meanwhile, SH27 at Kaihere in the Waikato is closed after a truck carrying food rolled just before 3.30pm.
The road also remained closed this evening. Diversions are in place from Kaihere Rd to State Highway 2.
Fire and emergency shift manager Karen Larking said they had four crews at the scene, from Waiouru and Turangi.
They were currently helping police and vet staff remove cattle from the truck.