North Mole Drive south of the heliport at Rous Head will be closed for eight weeks from 30 September for seawall works, announced Fremantle Ports Western Australia.
The seawall was damaged during storms in June this year.
The works include repair and raising of the height of part of the seawall, and repair of the adjacent dual-use path.
The 250m part of the seawall that needs repair was built about 24 years ago and is adjacent to the new seawall built four years ago.
After it is repaired, this 250m section will also be raised in height through the addition of armour rock (granite), making it the same height as the new part of the seawall.
Raising of the height of the seawall in this section is seen as necessary to prevent future damage to the dual-use path during storms.
North Mole Drive north of the works will be open to the public as usual (7am-6pm each day) during the works.