Big swells battered the coastline, and winds reached gale force 8 on Sunday.
The cobbled slipway at Route du Port, just north of Fort Grey, bore the brunt of it.
Agriculture, Countryside and Land Management Services staff and engineers from the States’ Property Services have been assessing the situation.
Jan Dockerill from ACLMS said the next steps were to stabilise the slipway.
‘Very soon, over the next few tides and then we’ll look to do full-scale repair and the best way to do this,’ she said.
Ms Dockerill said they were told of the damage on Sunday lunchtime and an engineer from the States Property Services was called out that afternoon to assess the damage.
‘Tides are very strong, these things happen from time to time,’ she said.
Engineers were carrying out an assessment of the damage yesterday and said that they expect the hole, which is currently around 12 by eight metres in size, to increase as the tide comes back in.
‘Just yesterday afternoon, at a similar sort of time to now [about 2pm], about a third of this was in place,’ said one engineer.
They said that the reason for the quick loss of even more of the slipway was that there was not a great deal of substance supporting it.
The slipway is closed while work on the damage is underway.
ACLMS have said that they welcome reports from islanders who spot any damage on Guernsey beaches. Its email address is aclms@gov.gg.
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