While the heaviest falls were reported on the Taupo plateau side of the highway there were moderate falls across the Titiokura range on the Bay side.
"We had a fair bit in some areas."
Contractors had been working with graders and snow clearance machines to clear it.
It was the first major snowfall of the year across the highway and the first closure of the year.
Mr Dowdell said conditions had begun ti clear and the situation was being monitored "by the hour".
He advised people planning to travel north to check for road condition updates on the New Zealand Transport Agency website.
He said even if the highway were to re-open later today or tomorrow people should use it "only if absolutely necessary" as there was still the prosect of possible ice building up in some areas.
There were no weather-related issues on other highways through the Bay.