Blackhall Mill, timber posts in River Derwent

A series of timber uprights are visible on the northern bank of the River Derwent at Blackhall Mill at low tide. Two lines of posts run parallel with the riverbank for a considerable distance and converge to a point at one end. They presumably were part of a loading platform, quay or staith for the mill (HER 3405) or the steel works (HER 1017).