The refurbishment of Newport Bridge in Teeside has been delayed due to unforeseen damage on the Grade II-listed structure.
The cost has jumped from £1.6M to £4.1M, and the scheme will not be finished until next Spring at the earliest, according to the Evening Gazette.
Pyeroy Group is main contractor on the revamp of the 80-year-old bridge, which involves repairs and repainting.
It started work on the project in July, but some 50,000m2 of metal was found to be damaged, and it is now estimated that more than 40% of the bridge is suffering from corrosion.
A birdcage scaffold will be constructed to allow the A1032 to reopen at the end of October for motorists, while the remaining repairs and painting take place.
The bridge was originally due to reopen on 7 September, with repainting completed by 7 November.
Stockton Council’s head of technical services Richard McGuckin said “categorically” that the Newport Bridge “was safe”.
But he said the council had been forced to “resequence the work” as a result of the damage, which will mean the project runs into next year.
The Newport Bridge was the first of its type to be built in Britain, and when it opened in 1934, it was the largest “vertical lift bridge” in the world.
It is upstream from the more famous Tees Transporter Bridge.