Motorists are advised to allow extra time from next week if crossing Cooreei Bridge on Stroud Hill Road at Dungog.
Transport for NSW will carry out essential maintenance work from Monday April 19, which includes repainting the bridge.
The work is expected to be complete in six weeks, weather permitting.
There will be some temporary traffic changes during work hours, from 7am to 5pm on weekdays, to ensure the work zone is safe for workers and road users. The bridge will be operating under traffic control at times and motorists may experience short delays.
Motorists are advised to allow extra travel time, drive to the conditions, and follow the directions of signs and traffic control.
For the latest traffic updates download the Live Traffic NSW App, visit livetraffic.com or call 132 701.