The Welney Causeway (A1101) is open again after flood waters receded.
The road was closed on Friday, 23 November after prolonged rain caused the Ouse Washes to flood.
At the end of December, temporary flood defences were put up to contain the water, which was 1.44 metres high on the Causeway Road.
Around 30 one-tonne sandbags were put across the road for the first time since 2007.
The river level is now 2.42 metres at Welney, which is still slightly higher than the typical range.