A crane will be needed to help install a temporary fix on a weak pile in Whangārei's Town Basin.
Whangārei District Council parks and recreation manager Sue Hodge said the failing pile was discovered last week.
She said the council had the pile inspected by engineers.
The engineers recommended restricting public access and carrying out a temporary fix until a permanent solution is implemented.
The pile is underneath the cantilevered deck near the marina office. Fences have been put up to restrict public access to the affected section of deck and the gangway has been limited to one person at a time.