The structure, located near Maxwell Park station. was closed in August due to the bridge's deterioration and safety concerns.
The first phase of the replacement project will take place from Saturday, 25 November until 22 December. Scaffolding will be erected around the bridge to prepare to divert utilities such as water and electricity off the structure.
The second phase of the scheme, beginning in January next year, involves removing the existing bridge and erecting a new structure which is fully compliant with modern road and rail safety standards.
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Features include removing excess vegetation from around the structure, as well as temporarily removing then reinstalling overhead power lines while demolishing the old bridge deck and craning in the new one.
Owen Ferry, Network Rail project manager, said: "The work we are undertaking is vital to the long-term operation of the railway and will also provide road users with a much improved structure free of the current restrictions.
"The plans we have put in place are the most effective and quickest way to deliver the project and remove this unstable structure, and the risk it represents, from our railway.
"We understand the inconvenience this work will cause to some residents and are committed to completing the project as quickly as we can and with a minimum of disruption."
The project is scheduled for completion in May 2018.
(LM/MH)
