Slippage of a river bank has prompted the closure of a road in Ten Mile Bank.
Engine Road is currently closed while the Environment Agency investigates the cause of a crack which appeared in the river bank.
Norfolk County Council has now closed the road until the investigation has been completed. That is likely to take several weeks.
A council spokesman said: “The Environment Agency has spoken to the residents most affected to advise them of the situation and action being taken.
“A temporary Flood Warning Area has also been created as a precaution in order to warn local residents if needed.
“We are currently investigating the cause of the bank slippage and will be carrying out emergency repairs.
“There are a number of factors which could have caused it, including ground conditions, but it is rare for this type of bank slippage to happen.”
The current road closure runs from a point 850 metres from Modney Bridge Road to Lowes Farm Cottages.
A fully signed diversion remains in place via Littleport.
The county spokesman added: “Emergency services care informed of the closure so that alternative arrangements can be made.
“Norfolk County Council and the Environment Agency recognise the closure may be disruptive and apologise for any inconvenience.”