People are putting themselves at risk by vandalising barriers to cross a "dangerous" bridge, police and councillors have warned.
The former railway bridge off Linden Farm Drive, in Countesthorpe, was temporary closed in November after a structural survey by the county council found it was in a dangerous condition.
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However, the fences have been vandalised three times since November and police tape has been torn down.
More fencing was installed on Tuesday and people have been warned again to stop using the bridge.
Pc Martin Aston, who patrols Countesthorpe, saw footprints in the snow on the bridge this month.
In a message on Twitter, he wrote: "Have seen some irresponsible person has removed police tape from barriers on bridge off Linden Farm Drive. Substantial fencing now to be erected.
"Be warned, any person caught going through barriers and using the bridge risks arrest and going to court.
"People continue to risk serious harm or injury using the bridge. The bridge structure is unsafe. That means it could collapse."
A county council spokeswoman said the authority had been in communication with the person believed to own the bridge and their legal representatives.
She said it would remain closed until it was deemed safe.
The spokeswoman said: "The bridge is privately owned.
"However, as it forms part of a public right of way, we have imposed a temporary closure following a structural report that showed it is in a dangerous condition.
"Safety fencing has been erected but, unfortunately, has been broken down on several occasions and has required replacing.
"We would ask people not to force entry on to the bridge as it is not safe."
David Jennings, parish, district and county councillor for the area, said the railway line under the bridge had been closed to passenger trains in 1961.
He urged people to take note of the barriers.
"It is a real and dangerous situation," he said.
"I do not know who is removing the barriers and crossing the bridge but I wish I did because I would report them to the police," he said.
"It's not a bit of fun – the barriers are there to keep people safe."
He said the bridge could eventually be repaired or removed.