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Dunedin City Council transport projects team leader Gareth Evans said the work, which was almost finished, was part of regular sea wall maintenance.
''It's just a matter of us repairing it so we get another 50 years of life out of it.''
The council had a $700,000 annual budget for the work.
After the Magnet St work, areas near Aramoana, Coast Rd near Waikouaiti and Kitchener St would be done.
Mr Evans said the sea wall was replaced ''like with like''.
Areas of stacked rock would be replaced with stacked rock, and at Magnet St with rocks piled up.
He said the power poles near the harbour were not in danger of falling, but ''that's the sort of thing we try to prevent''.