The road between the A6136 through Catterick Garrison and Tunstall could be closed for months after a vehicle damaged a bridge for the third time this year.
Brough Bridge, near Brough Hall, was badly damaged on Thursday night.
The road has now been closed by North Yorkshire County Council Highways.
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North Yorkshire County Council leader and Catterick Bridgeward councillor, Carl Les, inspected the damage this afternoon.
He said: “I’m very disappointed as it’s at least the third time the bridge has been hit this year.
“The road could be closed for months now as the bridge wall has been completely knocked down, unless some temporary barriers can be erected.”
However, the councillor said the damage was so bad that this may not be possible as it could be a safety risk.
He said the work cost the council many thousands of pounds and would take time as the bridge was listed and planning permission would be needed from Richmondshire District Council.
He said the damage was especially disappointing as concrete bollards had been installed to protect the bridge.
A North Yorkshire County Council spokesman added: “Brough Bridge is closed again following a third strike this year.
“The bridge is narrow and in order to protect it, NYCC Highways have erected signs and barriers to reduce the available road width. Unfortunately, these are continually being ignored by larger vehicles, which are causing the damage. The signs and barriers are in addition to the weight limit Traffic Regulation Order.
“Brough Bridge is Grade II listed and, following an assessment of the damage yesterday, the decision to close the bridge was made for safety reasons. The bridge will be repaired and rebuilt as soon as possible.’’