A £280,000 project to repair water damage to a bridge on the A82 Fort William to Glasgow road is due to start on Monday.
However, trunk road maintenance agency Bear Scotland is promising that it will have “little impact on motorists”.
The work will repair scour – damage caused by swiftly moving water – beneath the bridge, which spans the tidal River Kiachnish south of Fort William in Lochaber.
It will also involve concrete repairs to the walls underneath the road.
Traffic management will be in place for a few hours on some days to allow delivery of materials and vehicles to access the site during off-peak times.
The full programme of repairs under the bridge are scheduled to take up to 12 weeks to complete, with the works taking place between 8am and 6pm Monday to Friday.
Bear’s north west representative Eddie Ross said: “Recent safety inspections of the bridge have highlighted the need for scour repairs to be completed beneath the bridge to strengthen the walls of the structure, ensuring it continues to function safely for years to come.
“We recognise that the A82 is one of the main routes into the Highlands, so we’ve planned the project to take place off-road, meaning the scheme will have little impact to motorists using the A82 carriageway.
“We do however ask motorists to pay attention to any traffic management that is in place for their safety and adhere to any warning signs as required for the protection of our teams.”
