The water sports hot spot and tourist destination is back from the brink and filling fast as floodwaters flow.

Keepit Dam levels reached almost 54 per cent on Thursday afternoon after a raging Namoi River brought recent rain into the supply.

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This time last year Lake Keepit was struggling at just 12 per cent, and had jumped up to 44 per cent by the time 2021 rolled around.

Heavy rainfall in the Namoi catchment in the past few days caused the river to surge over the weir in Manilla and downstream into the dam.

It's brought about a noticable change in the dam level, with the water rising almost two metres in the past week.

Inflows to the dam have been significant during that time, with more than 30,000ML of the resource running into Keepit on Tuesday and Wednesday alone.

That's the largest daily inflows for the dam in the past 12 months, and is enough water to fill an Olympic swimming pool more than 12,000 times.

The Namoi River was expected to reach minor flood levels in Gunnedah and Boggabri overnight.

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