Thwaite Watermills is an industrial museum in the city of Leeds, England. It is part of the Leeds Museums and Galleries group and is a real water mill dated 1823-1825, but fully functional. It has been classified as one of the improvements, sadly, even the last remaining examples of a water mill in Great Britain. The mill, the director's house and three associated buildings are all Grade II listed buildings. Over the centuries, the mill has been used for several purposes. Given its favorable position, on an island between the River Aire and the Aire and Calder shipping, the mill was extremely self-sufficient: it even produced its own energy from two water wheels and a Marshall engine that had been purchased to power the Raymond Mill in the 1930s. T he Thwaite Watermills became a museum in 1990 but as early as 1975 the water wheels stopped turning. The museum, in addition to the water wheels, later repaired, and now working, contains an interesting collection of machinery used in various eras. The director's house itself has been restored to tell what life was like there in the 1940s. The museum site also hosts a 1946 steam crane and wildlife areas.