The bridge, which spans the River Forth, was build in 1831
Repairs to one of Stirling's oldest bridges is to begin this weekend.
The B-listed Stevenson Bridge, which carries more than 16,500 vehicles a day on the A9, was built to span the Forth by Robert Stevenson in 1831.
Stirling Council said the five-span masonry structure had developed internal weaknesses and needed urgent repairs.
Work to fix pipelines buried within the bridge will begin on Sunday, 28 June and last seven weeks.
As a result, the route will be reduced to one-way northbound traffic only.
The road will be closed to all southbound traffic accessing the bridge from the Causewayhead and Cornton direction. Diversion routes will be in place.
The bridge serves as a direct route into Stirling from sites such as the Wallace Monument and Stirling University.
The timing of the repairs has attracted criticism from those within the tourism industry who fear it could cause disruption for visitors to the area.
Stirling Council has also warned that all necessary work to ensure the structure could continue to support the A9 would take "several years".