Heavy rainfall has caused fresh damage at a Lyell Highway landslip, forcing authorities to drop the speed limit to 30km/h and narrow the road by a metre.
The trouble spot between Hayes and Rosegarland has been plagued by rising water levels, despite contractors installing rock protection and monitoring conditions alongside Hydro Tasmania.
Geotechnical experts inspected the area on Friday and confirmed it remains safe for motorists.
However, barriers have been moved further back from the crumbling edge as a precaution.
“The damage is contained behind the safety barriers, within the work site,” State Growth said in an update.
The highway remains open to a single lane, though it could close without notice if conditions worsen or flooding occurs.
State Growth contractors have been working around the clock to monitor the site and assess the damage.
“Despite these efforts, the extreme conditions have impacted the area,” their update said.
Heavy vehicles up to three metres wide – including both general access and restricted access vehicles – can still travel through, but all others must take alternative routes.
The landslip first occurred in September 2024 when the River Derwent flooded.
The highway has been operating under single-lane restrictions ever since.
Repair work began in late August this year following extensive investigations and specialist assessments.
The project had already been delayed by bad weather and high river levels.
