The works had been expected to start next week but will not take place until the next financial year as it is understood that South Gloucestershire Council was unable to appoint a contractor in time.
Girder repairs are needed following an accident in February 2015 when a vehicle hit the14ft 3in height restricted bridge which carries the Bristol & Bath Railway Path and the steam railway over the A431. The bridge will also be repainted and the parapets replaced.
The council says it still intends to carry out the works but before setting a new date will need to consult with relevant stakeholders, including Avon Valley Railway. The works will last about two weeks and will see traffic diverted via Oldland Common to Bridgeyate, along the A420 to the ring road at Longwell Green and then along the A431 to Willsbridge (and vice versa).
Signposted diversions will also be in place for cyclists and other railway path users.