The Department of Infrastructure says Orrisdale Road will be closed until no later than 22 February.
Efforts are under way to remove fallen trees and clear stones washed ashore due to Storm Bram.
The works will see daytime closures on the A24 between Foxdale and St Marks for a fortnight.
Severe gales brought by Storm Darragh cause the suspension of all Manx flights, ferries and buses.
A visiting cyclist was injured in the collision with a car on the A26 in St Marks on Wednesday.
Work on the pipeline between St Marks and Grenaby will begin on 19 April, Manx Utilities says.
Revised proposals for safer access to properties in St Marks are put forward for approval.
Twenty-five elms will no longer be removed if new road access plans are passed, the government says.
The naturalist calls for alternatives to be sought in a row over the felling of 25 trees in St Marks.
