The mangrove boardwalk in Tumby Bay will be partially removed to prevent public access after it was deemed unsafe by an independent consultant.
A Tonkin Consulting report provided to the council on July 1 outlined a number of compliance issues and major structural concerns with the boardwalk's concrete supports.
Significant flaking in the concrete supports was observed at the eastern end, while at the western end some concrete supports "appeared close to full collapse".
The 70-metre boardwalk was built about 25 years ago.
"Tonkin do not recommend that the boardwalk remain accessible to the public in its current condition due to the real risk of collapse or injury to one of its users," the report said.
"...structural issues have advanced to a point where remediation is not an option but full replacement of supports would be required...this would essentially necessitate full boardwalk replacement."
The council's works manager Damian Windsor recommended the partial removal of the boardwalk to prevent public access and for the council to consider budgeting for the full removal of the structure at its first budget review.
"There is a high risk associated with leaving that open to public access," he said.
He said the decision was something that had needed to be made for a while and partial removal would begin in the coming weeks.
Mr Windsor will also prepare preliminary cost estimates for a replacement structure for the council to consider.