Work started last week on repairs to Drefechan Bridge on the Pentre Llanrhaeadr to Llanynys road.
The bridge was closed after damage caused by Storm Dennis last month and Denbighshire County Council has been assessing the condition of the bridge.
It is hoped the bridge could be open by the end of March, if conditions allow, but the Council is working hard to minimise this unexpected disruption.
Diversions are in place via Rhewl and the Council apologises for the inconvenience caused by the closure.
Cllr Brian Jones, the Council’s lead member for Waste, Transport and the Environment, said:
“To ensure the safety of residents we have closed the bridge and we would like to thank members of the public for their understanding.
“We intend for this work to be completed by the end of March with further work required in the summer months.”