Severe weather forces Rest And Be Thankful road shut
Road officials closed the route on Tuesday morning after around 2,500 tonnes of debris reached the catch-fences above the carriageway.
A 60-mile diversion has been put in place.
It came amid heavy rain and strong winds which hit western parts of Scotland, with a yellow weather warning in place.
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Hide AdFour recently installed fences stopped most of the material from reaching the A83 carriageway, but a large boulder damaged one and some debris reached the route.
The Old Military Road below - sometimes used as a diversion - was also affected and remains shut.
Traffic Scotland has said the Rest And Be Thankful road closure will be in place until further notice.