Officers from St Ouen’s honorary police closed the area on Thursday morning, after fears were expressed that further sections of the structure could fall into the sea.
Centenier Richard Buchanan said that the area could be closed for some time.
‘I am no structural engineer, but it is not good towards the northern end of the pier – it is likely to continue to erode away.
‘There is a big crack across the car park and some of the railings have fallen away. The Infrastructure Department have been notified and are going down to sort it out but they are clearly stretched to the limit at the moment. In the meantime, I would advise people not to go down there – it is definitely not safe.’
Mr Buchanan said he had not seen such large waves at Grève de Lecq for many years.
‘I could see the waves curling round from Grosnez and they were at least 20 ft high – I have not seen it that bad for a number of years.
‘The car park will remain closed until it is stabilised,’ he said.
Meanwhile, Adam Querée, owner of the nearby Colleen’s Café, said that although his business had sustained some damage during high tide on Wednesday, it got through Thursday unscathed.
He added that the café was due to reopen on Saturday following the Christmas break and that there were still a large number of parking spaces available in the bay.