Bureau of Meteorology's senior meteorologist Deb Tabor said the largest downpour was in the east with 275 millimetres record at Gray, St Patrick's Head had 180 millimetres and other areas had in excess of 100 millimetres across the East Coast.

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Ms Tabor said it was a "standout day" for Tasmania, which doesn't often receive rainfall totals as those recorded overnight.

"To have rainfall tallies in excess of 50 millimetres and just under 300 millimetres is not an uncommon occurrence for Tasmania. We have seen it before but doesn't happen regularly," she said.

The major flood warning issued for the South Esk River was downgraded on Thursday morning. However, Ms Tabor still advised people to stay aware and take caution on the roads.

State Emergency Service crews responded to 15 requests for assistance in the northern region, mostly in the Break O'Day Council area.

A department spokesperson said the call outs related to damaged roods, water inundation into properties and through ceilings of homes.

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"SES assisted these properties with sandbagging and installing tarps," they said.

But, fortunately, none of those incidents reported were not considered serious.

St Helens Inspector Michael Johnston said police were working with local government and other authorities to reopen roads as soon as they could.

He said the best way to stay up to date on what roads were closed was to check the Tasmania Police community alerts website.

"We haven't had multiple call outs, but we have had inquiries on what roads are open and what are closed," he said.

"At the moment about half a dozen minor roads in St Helens remain closed. The only main road is the one through to Binalong, but there is an alternative route people can take."

Inspector Johnston said the advice they had was unless there was further rainfall, the flooding should recede in the next few days.

"Our advice to drivers in the area would be even if a road has been reopened, drive to the conditions," he said.

"Be aware of any damage to roadways or any debris on the road that may be hidden as the water recedes to keep yourself safe."

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