Work to remove 40-year-old sea defences on Hayling Island begins today.
The 140m wooden structure on West Beach was severely damaged in storms in 2019 and 2020, but Havant Borough Council said it would not be replaced.
The beach area around the structure will be closed to the public and a section of car park will become a temporary compound for contractors.
Footpath diversion routes will also be in place.
More than 3,000 people signed a petition urging the council to better protect the beach from erosion.
Coastal communities councillor Leah Turner said: "Following their removal it is expected the waterline will change as the beach adjusts back to its natural contours."