From tomorrow (18 April), work will begin to shore up a collapsing quarry face in the Vale.
Building the barrier at L'Epine will allow the minor lane next to it to reopen.
The road was closed without warning last June because it was considered dangerous.
The Vale Constables were told by Guernsey Water that the barrier, or 'bund' is a sizeable structure.
The stone will be brought in by tractor, so parking in the access road will be suspended on weekdays.
"Tropical nights" forecast for the Channel Islands
Daytime highs in the 30s and nighttime temperatures around 20°C are forecast for the Channel Islands.
Guernsey rabbits at risk from two deadly diseases
The GSPCA is warning rabbit owners of two fatal diseases spreading through Guernsey.
Exhibition to celebrate 90 Years of Guernsey's Ambulance Service
Nine decades of Guernsey's Ambulance & Rescue Service will be commemorated this summer.
Guernsey sewage pipe repairs "unlikely to be a quick"
Swimmers in Guernsey may need to avoid the waters around Soldier's Bay for some time.
Guernsey FC to fight for promotion at Victoria Park
The Green Lions are getting ready to host Peacehaven & Telscombe FC in the Southern Combination Football League Play-off Final.
Move to return St Julian's House to Guernsey's emergency shelter
Homelessness charity 'At Home in Guernsey' says it is crucial St Julian's House has free beds for emergency situations.
Jersey and Guernsey included in UK-Gulf trade deal
Jersey and Guernsey have been included in a landmark UK deal with Gulf states that is being hailed a 'significant' boost to the islands' economies.
St Pier says States put investigation before his experience in P&R seat vote
Deputy Gavin St Pier says public perception, not who is best for the job, influenced decisions.
