Repair work to the slipway at Douit du Moulin begins this week.
The work, which should be completed in May, will reinstate the access route to the beach.
A section of the slipway suffered damage during bad weather towards the end of last year.
At that time urgent remedial repair works were done to prevent additional damage that could undermine the structural integrity of the slipway.
Now the weather has settled, long-term repairs can be made.
Agriculture, Countryside & Land Management Services says cast concrete is the most economical and practical solution at £65,000.
It says the alternative - a full masonry repair to reinstate the original granite - would have cost an extra £95,000 and taken three times longer.
The repair will match one at the top of the slip where it meets the coast road.

Ban for Guernsey supporter cautioned over Muratti trouble
Guernsey gets hooked on fresh fish
Brittany Ferries yet to open winter Guernsey-Portsmouth bookings
Direct flights to Sardinia next summer
GST take cut by £3m as Guernsey's tax reform debate looms
Location chosen for more homeless sleeping pods in Guernsey
Enhancements planned for Guernsey's second harbour
European praying mantis spotted in Guernsey garden