The various staiths at Blyth were demolished at slightly different times. The higher structures were known as the 'superstructure', and the sections in the water were the 'substructure'. The Blyth Harbour Commission owns the 'substructures' and they are now 'listed buildings'. The 'superstructures were owned and maintained by the railway company NER / BR.
The huge South Staith which was the town side of the river was dismantled during 1966. Shortly after that, the Cowpen Coal staiths were removed 1968, to make way for the Alcan terminal which opened 1971 and the first offload at Alcan took place on the 29 June 1971. Then after that the North Staith was dismantled during 1972, famous for the film Get Carter and Michael Cain which was filmed late 1970 and first shown 10 March 1971, the staith certainly all gone by 1975. The West Staith remained in use until I think 1993/4 and after the diesel locomotive depot was closed at North Blyth in 1994, the West Staith was removed 1996. The large Bate's Staith with it's carriages was dismantled June 2014.
P