State Emergency Service (SES) crews working around the clock after major Namoi River flood in Gunnedah

The Namoi River hit about 8.2m on Wednesday and stayed there for hours, causing some homes and properties to be inundated.

Volunteers and a specialist flood rescue strike team from the State Emergency Service (SES) were kept busy responding to calls for assistance, including to help landowners move livestock out of deep water.

SES spokesperson David Rankine said crews and choppers were on call across the region to assist anyone isolated by floodwaters.

"Volunteers have been very active," he said on Wednesday.

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Rapid damage assessment teams are doing the rounds as the water subsides.

The peak could go on to affect Wee Waa in the coming days, which Mr Rankine warned may be cut off from all sides if the major flood level is reached.

The SES has turned its attention to the gloomy weather forecast, urging residents to be prepared and call 132 500 without hesitation if they need help.

Call Triple Zero (000) in a life-threatening emergency.

"We're focusing very much on the possible impacts of this rain in the next couple of days," he said.

The Bureau of Meteorology (BoM) is predicting more of the wet stuff to fall in already soaking and overflowing catchments.

Roads across the Gunnedah shire and Tamworth area remained closed, including the Kamilaroi Highway between Gunnedah and Boggabri. The Oxley Highway between Gunnedah and Tamworth reopened.

A handful of flood rescues earlier this week have prompted a fresh plea from emergency services to obey road signs and never enter floodwater.

The Peel River in Tamworth dropped below the minor flood level in Tamworth on Wednesday though further rises are possible with rain on the horizon.