Slade Brook (grid reference SO564055) is a 3.63-hectare (9.0-acre) biological and geological Site of Special Scientific Interest in Gloucestershire, notified in 2003.

[1][2] The site, which includes an active tufa-forming stream, is in the Forest of Dean plateau and Wye Valley Area of Outstanding Natural Beauty.

[1] The process is assisted by vegetation (which includes tree litter such as twigs and branches), algae and mosses.

They enable research into the origins of fossil tufa dams as well as modern formations[1] The white-letter hairstreak butterfly is recorded at this site.

[3] Natural England reports in March 2009 that the site remains in a favourable active condition.