Divers have been investigating issues at an 800-year-old bridge which is set to remain closed for months longer than first expected.
The bridge in Potter Heigham was due to reopen on Thursday, January 12, after a hole "the size of a size 10 boot" appeared in the road last month.
But after further inspection, it was not deemed safe for vehicles and work to fix the issues is going to take longer than first thought.
National Highways is working with English Heritage to fix the problems affecting the ancient heritage asset, which could be nearly 800 years old.
Teams are currently in the investigation stage of the process and will await results before proceeding with the necessary work.
The bridge is expected to be closed until at least April 12.
Richard Price, county councillor for Potter Heigham, said: "This is not a quick fix. There are so many potential reasons and explanations for the problems, which are being investigated.
"It is not a simple process and has to be done properly to make sure nothing worse will happen.
"This will be a long process and we cannot rush it."
Dye tests were carried out to find the source of the problems of the bridge as the dye shows where the gaps and leaks in the structure are.
These were reported to have gone well and showed faults in the arch under the bridge, as well as further down in the structure under the water line.
Following this, divers entered the water to investigate the issues.
The bridge has been assessed as safe for pedestrians and cyclists to continue using.
There is a small diversion in place for drivers and temporary bus stops have been created so services can continue.
A spokesperson from Norfolk County Council said: "Work is being carried out to inspect the bridge and understand the cause of water seepage.
"Once this has been completed and any defects found we will schedule repair work.
"There is no risk to public safety."
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