Contractor Balfour Beatty, which is refurbishing the structure, said the work was progressing well.
The bridge’s old white iron lattices are back in place and the workmen’s hoisting crane and barge will pack up soon.
The lattices no longer support the structure as it has been successfully reinforced with 24 steel girders and three new pier supports. These transfer the weight of passing vehicles on to new foundation piles set 30m into the river bed.
The engineers will soon begin resurfacing the road in readiness for the bridge to re-open.