Lord mayor Graham Quirk and councillor Amanda Cooper at Kingsford Smith Drive.Credit:Jocelyn Garcia,Fairfax Media
Cr Quirk said geotechnical work by a contractor had revealed a section of the project was causing a problem for council.
"There is a section between Toorak Road and Grays Road which has been an issue for us,"he said.
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"The river conditions are very varied and as a result of that,there is going to be a need for ground anchors to be placed around 50 metres into the bedrock to ensure the long-term structural soundness of that,if you like retaining wall in the river.
"So this has meant that the section in the middle of the project will be delayed."
Cr Quirk said the council was working towards dealing with the issue,but the delay meant the main section bin the Grays Road area would be delayed.