Durham County Council has begun work on a £2.5m scheme to demolish and replace a road bridge near Bishop Auckland.
Witton Park Bridge was closed in 2018 after it was found to be suffering from ‘structural issues’.
A detailed design and construction programme has been developed, involving the demolition of the existing structure, repairs to the abutments and piers and the installation of the new bridge.
The council confirmed last year that it would fund the replacement works.
Strategic highways manager Brian Buckley 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.’
Cllr Brian Stephens, cabinet member for neighbourhoods and local partnerships, 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.’
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.
The replacement bridge is scheduled to open in late autumn 2020.