There were medieval corn mills at Bradfield, Damflask and Owlerton, and cutlers wheels were in use at Wisewood in 1521, at Ashton Carr in 1549, and at Slack Wheel, near the confluence with the Don, in 1581. Development after 1720 was rapid, and a shift to heavier industry occurred from the early 19th century, with forges replacing cutlers wheels, or in some cases being built alongside them. Many of 24 known mills, wheels and forges were swept away or damaged in 1864 by the flood, but although steam power was gradually replacing water power elsewhere, most of those rebuilt continued to use water power, at least in part. Although the mill buildings have mostly gone, several of the weirs and dams remain, and there are still water wheels at Malin Bridge corn mill and Low Matlock rolling mill.