The road between Doneyloop and the Crossroads Village in East Donegal will be closed for the next few days.
This is due to a bridge collapse in Tiernisk, Castlefin.
The alternative route is the N15 national road from Liscooley to Castlefin.
Lifford-Stranorlar Councillor Patrick McGowan is urging motorists to leave extra time for journeys:
