The By-pass bridge over the River Cree will be shut to traffic overnight for two weekends to allow engineers to carry out improvements.
During the two weekends, Friday 12 to Sunday 14 June and Friday 3 to Sunday 5 July, all traffic on the A75 will be re-routed through Newton Stewart and across the Cree Bridge.
East-bound traffic will be taken via Barnkirk and Douglas Terrace then over the Cree Bridge and west-bound traffic will be brought into town via the New Galloway road, over the Cree Bridge and up via Queen Street onto the A75.
A spokesman for the contractors said: “Scotland TranServ, working on behalf of Transport Scotland will carry out a programme of works on the A75 at Cree Bridge beginning Friday 12 June. With the road surface coming towards the end of its operational life Scotland TranServ will improve the quality of the surface and waterproof the bridge deck. Temporary, two way traffic signals will be in place throughout the works, which will be carried out over three weeks. There will also be two, weekend total closures of the Bridge between 8pm and 6am from Friday 12 until Sunday 14 June and Friday 3 until Sunday 5 July.”
Gordon Wilson, contract director, Scotland TranServ said: “This maintenance scheme will not only improve the road surface but also ensure the A75 at Cree Bridge is in optimum condition ahead of the busy summer season.
“Work will take place traffic flows are lighter in order to minimise disruption however I would urge motorists to plan their journeys.”
Advanced warning signs will also be in place on the approach to the works to inform motorists that roadworks are taking place.
Eastbound A714, right turn onto King Street - left onto B7079 New Galloway Road, A712 re-join A75 at Bankirk.
Westbound right turn onto A712 – left New Galloway Road – left Victoria Street, Newton Stewart Roundabout to rejoin the carriageway.