Work is scheduled to start on site in May for completion in February 2015.
The current 22-span structure carries the single track Cambrian Coast railway from Dovey Junction to Pwllheli and a single-track toll road across the Afon Dwyryd for cars. Heavier and larger vehicles, such as lorries and buses, are unable to use the existing bridge and face an extra eight-mile journey from Penrhydeudraeth to the Harlech road.
The proposed new structure will continue to carry the single track railway but also provide a two-lane public highway and cycle route. Toll fees will be removed when the project is complete.
The new bridge will be 18m wide, compared to the existing 8.5m-wide structure. It will be built in phases to minimise disruption to train services. A temporary bridge will be provided for road traffic.
The line speed across the new bridge will also be raised from 30km/h to 65km/h.
Design development has been delivered by both Network Rail and Gwynedd Council, who have worked together on ground investigation and environmental surveys. Gwynedd Council is managing the project.
Mark Langman, Network Rail’s Wales route managing director, said: "This scheme joins a number of other rail improvement projects in North Wales that will help deliver better journeys and boost economic growth in the area. The work at Pont Briwet bridge will make it easier to get to travel between Harlech, Penryndeudraeth and Porthmadog and we would like to thank people for their patience whilst this important work is carried out."
Funding for the project comes partly from Network Rail but also includes £9m from the European Regional Development Fund to allow for a full replacement of the existing structure rather than continuing to make on-going repairs.
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