The A1101 Welney Causeway has been closed because of a flood warning.
Cambridgeshire County Council tweeted that diversions were in place.
According to the Environment Agency website, the river level at the causeway was 2.43m at 12.45pm yesterday, above its typical range of 0.46m to 2.40m.
Cambridgeshire County Council said the river is expected to rise further.
Julie Foley, EA area manager, said “We are working closely with Norfolk County Council who make decisions on road closures. I would urge motorists not to ignore the road closed signs.
“Floodwater can be dangerous and just 30cm of flowing water is enough to move an average family car.”
The Environment Agency Operations Team are monitoring rivers levels and working hard to ensure water can drain off the Washes as quickly as possible.
The EA has been checking Welmore Lake Sluice on a daily basis while water levels have been rising to ensure it is able to discharge as much water as possible.
You can keep up to date with flood warnings for your area via the website www.gov.uk/check-if-you-are-at-risk-of-flooding or by calling Floodline 0800 988 1188
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here