The bridge's boardwalk has come to the end of its serviceable life and some of the handrails and posts need repairing or replacing.
The work will start on Monday 9 January and is due to be complete on 3 February.
The bridge will be closed during this time. However, if conditions allow, the nature of the work means it could be opened some weekends during this period, but this will depend on the weather and the progress of work.
All the boards, forming the boardwalk, will be replaced with new decking made from recycled plastic materials. The new decking will have the appearance and feel of wood but will last many more years.
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Parapet posts and rails that are unrepairable will be replaced with a sweet chestnut wood replicating the original design.
Councillor Ray Bryan, Dorset Council Portfolio Holder for Highways, Travel and Environment said: "The bridge has suffered from the effects of the weather since it was built in 2011 so the new boardwalk, made of longer-lasting materials, will help provide a structure that can remain safe and accessible for years to come.
"Many thanks to the rangers for their assistance at the site and our specialist team who will be carrying out the work. I’d also like to thank businesses, visitors and residents for their patience while we look after this important fixture.
"Finally, please always use sense and caution when visiting any of Dorset's beaches. The Jurassic Coast is a wonderful place to visit, but it’s important to use common sense and caution – and always pay attention to warning signs and messages about staying safe."
The work is being carried out by Dorset Council's construction team from its highways department. Using government funding, the council is responsible for the maintenance and improvement of its 2,500 bridges.
