The slip and breakwater at St Catherine are being surveyed to determine the level of repairs needed to secure the structure.
Sections of the slip were damaged during Storm Ciarán, leaving large cracks and heavy erosion of the stonework at the lower end.
The survey will be completed using drones, ground penetrating radar and multi channel analysis of surface waves to assess the full extent of the damage.
Access to parking spaces, the breakwater and slipway will be restricted for a time while large pieces of equipment are being used.
Ports of Jersey says the work is essential before being able to plan any repairs, which will be undertaken once the results have been analysed.
Jersey's oldest gorilla dies from cervical cancer
More revealed about missing Adam McGrath's last movements
37 affordable homes approved for St John
'Music Manifesto' asks government to support Jersey's music sector
Fort Regent plans will include skate park and children's play area
Ban on new fossil fuel boilers delayed
Jersey's Royal Marines Cadets crowned Britain's best
Politicians recommend improvements to Jersey's assisted dying proposals