This site is currently occupied by a small electricity substation surrounded by regenerative scrub. This plant probably relates to the site of Sheffield Power Station (demolished) on the opposite bank of the river Don. The area of this polygon represents the area of river bank enclosed by the goits of the Owlerton Rolling and Slitting Mill dated by Crossley et al (1989, 9) to the period 1753-1936. The dam and goits have been infilled but may be visible as slight depressions. Buildings demolished 1936. Fragmentary legibility of possible water power earthworks