Work to replace Witton Park Bridge, near Bishop Auckland, is set to begin next week (Monday 15).
A £2.5m scheme will see the demolition and replacement of the crossing, which was found to be suffering from structural issues in 2018.
Since its temporary closure two years ago, engineers have been exploring a number of options for its replacement.
As a result, a detailed design and construction programme was developed. This included the demolition of the existing structure, repairs to the abutments and piers and the installation of the new bridge.
The replacement bridge is scheduled to open in late autumn 2020.
Cllr Brian Stephens said: “This is an important crossing for local residents. I am delighted our engineers have been able to identify a solution and work can now start on the replacement.”
Brian Buckley, strategic highways manager at Durham County Council said: “The planning of this project has been a thorough process. The installation of the new bridge is a complicated one, due to the rail bridge which passes diagonally over. But it is necessary work and is important to ensure safety and long-lasting accessibility.
“The health and safety of our workers is paramount and will dictate how we work going forward. We will ensure that current government guidance is adhered to in relation to social distancing.”
The C93 will remain closed between the villages of Witton Park and High Grange, with a signed diversion continuing via the A68 and the neighbouring village of Witton-le-Wear.
More information on works can be found at www.durham.gov.uk/wittonpark