It comes amid the Met Office yellow "be aware" warning for rain which will remain in force until midnight tonight.
BEAR Scotland operatives and a specialist subcontractor are on site looking at the possibility of opening the Old Military Road diversion route, however this will depend on a full geotechnical assessment determining the safety of this option.
The standard incident diversion route, which is about 60 miles, is being put in place while the assessment takes place as a precaution.
The Met Office warned yesterday that the west of Scotland would feel the brunt of the rain today, with the east of the country staying drier.
More disruption is expected across the country on Friday with strong gales of up to 80mph expected.