The A83 Rest and Be Thankful has reopened under convoy amid safety concerns.
The Tarbert to Inveraray road was shut to all motorists this morning following concerns for the stability of the hillside.
Bear Scotland officials confirmed that heavy downpours overnight triggered a 500-tonne debris landslip.
Engineers were onsite monitoring the situation at first light as drivers were turned away from the area.
A convoy system has since been introduced diverting traffic onto the old Military Road as a precautionary measure.
The measures are likely to remain in place until Tuesday, whereby officials will decide whether the A83 can be reopened.
Motorists are being warned to expect delays of up to 20 -minutes as traffic is diverted around the area.
Eddie Ross, Bear Scotland project manager said: “The on-site traffic management team swiftly alerted of discoloured water and debris coming down a hillside channel at 7:30am this morning and the A83 was immediately closed as a safety precaution.
“The prompt mobilisation of the Old Military Road has minimised the use of the longer diversion route and ensured that Argyll and Bute remain open for business.
“Road users should expect delays of around 20 minutes whilst they are safely led through the short diversion route. We will review the situation over the course of the next few days to ensure it is safe to reopen the A83 fully, under traffic signal control.”
Fencing saved A83 from major landslide
Engineers inspected the hillside this morning to gauge an understanding of the severity of the landslide.
Geotechnical engineers confirmed the materials were successfully intercepted by the debris fences and pits installed in the area.
Mr Ross added: “The debris fences and pit have retained all of the debris from what was a considerable landslide event. They have protected road users and protected the road itself from damage and will greatly speed up the clear-up operation.”
The route has seen countless closures over the years after falling victim to serious landslips.
The A83 has been reduced to single-lane traffic since August 2020 as experts work to identify a solution to the problem.
On Friday, The Press and Journal exclusively revealed an “eye-watering” £16million has so far been spent by government officials over the last four years on consulting works.
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