Work to build a new structure to replace the existing A138 Chelmer viaduct and river bridge will start next month. The existing structure will be demolished when the new structure is completed and open for traffic.
The Chelmer viaduct and river bridge carries the three-lane A138 over the River Chelmer and its flood plain in Chelmsford, Essex. It carries heavy traffic but is deteriorating rapidly. Although the A138 has been de-trunked, the Highwasy Agency has retained responsibility for the viaduct until it has been replaced.
The 400-metre long, 17-span viaduct structure will be constructed of weathering steel (unpainted) beams with a concrete deck on elliptical columns. The river bridge will be constructed of weathering steel beams with an external concrete arch edging with an engraved stone inlay. The solid reinforced concrete abutments will be faced in stonework.
Contractor John Graham Construction is expected to take two years to complete the project.