The island's prime location at the intersection of several transport routes made it an important location for industrial activity in the nineteenth and early twentieth centuries. Several large factories were constructed, some of which still survive. However, after the second world war the city experienced a period of deindustrialisation, and many of the businesses which occupied the island have closed. Consequently, many of the large mills have become derelict, and have been damaged by vandals and by fire. Some manufacturing activity does still occur on the island, however, and some of the island's industrial features – such as the railway arches – have been repurposed for commercial use.
St Leonard's Works (Frisby Jarvis Building) St Leonard's Works were opened in 1867 and extended in 1881. The mill originally spun
worsted, and was constructed in the
Italian palazzo style. On both occasions, the building work was completed by Shenton and Baker, a local architectural practice. The company was a major employer in the area. Upon the closure of Frisby Jarvis in 1992, the mill was taken over by Martins Ltd – a company which also subsequently closed. Despite being listed in 2003, the building fell into major disrepair, and was badly damaged by fire in 2005.
Farben Works The Farben Works was another worsted spinning mill. It was opened in 1914, and was designed by Harding and Toppott in a classical style. It is grade II listed and, with the Slater Street School and Frisby Jarvis works, forms part of a significant group of historic buildings.
Hitchcock's Flour Mill Hitchcock's Flour Mill was constructed in the nineteenth century. It employed
water power to drive its equipment, and the mill race – which is crossed by a distinctive Victorian iron bridge – still survives on the island. In 1888, it was converted to steam power. The mill was badly damaged by fire in 2011, leading to its partial demolition.
Stephenson's Lifting Bridge The island was also the location of Stephenson's Lifting Bridge, which carried the Swannington Railway over the Soar Navigation. The bridge was designed by
Robert Stephenson, and careful counterbalancing allowed it to be operated by hand from a booth at the side of the canal. It was removed in the mid-twentieth century, became an exhibit at
Snibston Discovery Museum until that museum's closure and is now at the Mountsorrel & Rothley Community Heritage Centre where it is being rebuilt. == Leisure and culture ==