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WORK will start on Tuesday to prevent corrosion on the two Cockle Creek bridges on Five Islands Road at Speers Point.
Roads and Maritime Services (RMS) will install a cathodic protection system on the bridges.
Cathodic protection is used on large steel reinforced concrete structures to extend their life and reduce maintenance costs.
Connecting the reinforcing steel of the bridge to a more easily corroded metal helps protect the critical parts of the structure.
The cathodic protection system was successfully trialled on the bridge last year.
This system will now be installed on the supports of the original southbound north arm and south arm Cockle Creek bridges.
RMS will carry out the first stage of work on the north arm Cockle Creek Bridge then continue on the south arm bridge next year.
The first stage of work is scheduled to start on Tuesday, April 21, and is expected to be completed by the end of the year.
Work will be carried out on weekdays from 6am to 4pm.
Most of the work will be carried out from a barge in Cockle Creek with only minor traffic impact expected.
There will be no impact to boaters.