Derwent Valley Mills is a World Heritage Site located along the River Derwent in Derbyshire, England. It was named a World Heritage Site in December 2001 and is managed by the Derwent Valley Mills Partnership. The modern factory system, or "mill," began in the 18th century in this area to use new technology for spinning cotton created by Richard Arkwright. As technology improved, cotton could be made continuously. This system spread throughout the valley and later to other parts of Britain. By 1788, more than 200 Arkwright-type mills existed in Britain. Arkwright’s inventions and methods for organizing workers were shared with Europe and the United States.

Water power was first used in England by John Lombe at his silk mill in Derby in 1719. However, Richard Arkwright was the first to use water power to spin cotton in the 1770s. His invention, called a water frame, allowed cotton to be made continuously, which meant unskilled workers could do the job. Cromford Mill was the location of Arkwright’s first mill. The nearby village of Cromford grew to house his workers. This system of building mills and worker housing was copied throughout the valley. To provide housing for workers, mill owners built new communities around the mills. These communities often included schools, chapels, and markets. Much of the housing still exists today and is still used. Roads and other transportation systems were built to help sell the mills’ products.

Mills and worker settlements were also built in Belper, Darley Abbey, and Milford by Arkwright’s competitors. Arkwright-type mills became very popular, and sometimes they were copied without paying Richard Arkwright for the use of his ideas.

The cotton industry in the Derwent Valley declined in the early 1800s because other areas, like Lancashire, were better connected to markets and raw materials. Many mills and their buildings were preserved after the industry declined. Some of these buildings are listed as protected sites and are now used for museums or other purposes.

The Derwent Valley Trust is now working to build a bicycle path that runs the entire length of the World Heritage Site. This project aims to encourage eco-friendly tourism and travel.

Location and coverage

The Derwent Valley Mills World Heritage Site covers an area of 12.3 kilometers (4.7 square miles) and stretches 24 kilometers (15 miles) along the Derwent Valley in Derbyshire, from Matlock Bath in the north to Derby city center in the south. The site includes mill complexes, worker housing, weirs on the River Derwent, and the transport systems that supported the mills. It includes the communities of Cromford, Belper, Milford, and Darley Abbey. There are 838 listed buildings in the area, which include 16 Grade I, 42 Grade II*, and 780 Grade II structures. Nine additional buildings are designated as Scheduled Ancient Monuments. These buildings include mills, worker housing, and other structures connected to the mill communities. The Cromford Canal and Cromford and High Peak Railway, which helped the area develop industry, are also part of the World Heritage Site.

History

In the late 1600s, silk production grew because people wanted to wear silk in stylish clothes. To increase silk-making, Thomas Cotchett asked engineer George Sorocold to build a mill near the center of Derby on an island in the River Derwent. This experiment did not work, but it made John Lombe, who worked for Cotchett, believe that using water power could help create a market for silk. Lombe secretly copied plans for Italian machines and got a patent in 1719. He built a five-story mill next to Cotchett’s mill that was 33.5 meters by 12 meters (110 feet by 39 feet). By 1763, 30 years after Lombe’s patent ended, only seven mills using his design had been built because the silk market was small. However, Lombe introduced a working water-powered machine and created a model for organized labor that future industrialists used.

Silk was a luxury item, so the market was limited and could be filled quickly by machine-made goods. The next major development in textile production came with cotton, which had a larger market and produced cheaper goods. Spinning cotton was more complex than silk-making. Richard Arkwright invented the water frame, a machine that could spin yarn continuously, in 1769. These machines replaced skilled workers with untrained supervisors to operate them. Water frames had between 4 and 96 spindles. Because of this, water frames became popular. In 1771, Arkwright rented land in Cromford. By 1774, his first mill was working, and by 1776, he started building a second mill there. During this time, he created machines for pre-spinning cotton and got a second patent in 1775. After spinning was mechanized, other cotton-making steps also needed machines. Arkwright made a machine for carding, which aligned cotton fibers, but some tasks, like cleaning cotton, were still done by hand until the 1790s when a working machine was invented.

Arkwright needed money, so Peter Nightingale, a local landowner (and great-uncle of Florence Nightingale), bought the Cromford Estate for £20,000 (£3 million in 2025). Nightingale also built Rock House as a home for Arkwright and gave him £2,000 (£280,000) to build the second mill and £1,750 (£240,000) for workers’ housing. Between 1777 and 1783, Arkwright and his family built mills in Bakewell, Cressbrook, Rocester, and Wirksworth across Derbyshire and Staffordshire. Jedediah Strutt, Arkwright’s business partner, built mills in Belper and Milford between 1776 and 1781. Thomas Evans, a landowner in Darley Abbey, bought 7.1 hectares (18 acres) of land in Darley Abbey for £1,140 (£160,000) and built a cotton mill in the village in 1782. Arkwright earned money from people who copied his machines, though some faced legal trouble for stealing his designs.

Masson Mill in Matlock Bath started being built in 1783, led by Arkwright. Around the same time, Jedediah Strutt entered the cotton industry. Strutt benefited because Arkwright had already tested new machines, so Strutt did not need to spend money on research. Strutt built a mill in Belper, about 8 miles (13 kilometers) south of Cromford, which was likely finished by 1781. A second mill was added in 1784. Strutt also built a mill in Milford, about 2 miles (3 kilometers) south of Belper. By 1793, two more mills were added for printing and bleaching. The Strutts estimated they spent £37,000 (£5 million) on their mills in Belper and Milford by 1789 and earned £36,000 (£5 million) yearly.

Arkwright was known as a caring employer who cared about his workers and their families. A Sunday school was built in Cromford in 1785 to teach 200 children. By 1789, the Cromford Estate belonged to the Arkwright family again, who shaped the village’s structure. A marketplace was added to help the village grow. Arkwright held a market every Sunday and gave prizes to those who attended most often. After Arkwright died in 1792, his son, Richard Arkwright junior, took over and sold most of the cotton mills outside Cromford and Matlock Bath. The mills in Cromford and Matlock Bath were likely kept to support the Willersley Estate. Societies and clubs formed in Cromford. Arkwright was not focused on religion, but in 1797, Arkwright junior built Cromford Church, which his father had originally planned as a private chapel at Willersley Castle. The family’s effort to make Cromford self-sufficient through a market was successful, and the village grew until about 1840, even though the mills began to decline during this time.

Richard Arkwright junior was not interested in the cotton business, and after his father’s death, the Arkwright family stopped investing in the industry. The Strutt family continued to invest, using profits from their mills in Milford and Belper. They built more mills into the 1810s, and by 1833, their business employed 2,000 people and dominated the cotton industry in the Derwent Valley. Like Arkwright, the Strutts provided housing for workers. Belper was already a village with its own market before Strutt built mills there, so he did not need to develop the community as much as Arkwright did. The Strutts also provided education, and in 1817, 65

Transport

The Erewash Canal, started in 1777, was mainly built to carry coal. It ran from the River Trent in Sawley to Langley Mill, 14 miles (23 kilometers) south of Cromford. In 1788, Richard Arkwright asked William Jessop to calculate how much it would cost to build a canal connecting the mills at Cromford to Langley Mill. Jessop estimated the cost would be £42,000 (£5 million as of 2025), and this amount was raised within a few weeks. Local mill owners Jedediah Strutt and Thomas Evans disagreed with the plan, worried it might reduce the water supply for their mills. However, in 1789, Parliament approved the canal’s construction.

The Cromford Canal opened in 1794, but it cost almost twice Jessop’s original estimate. Between Langley Mill and Cromford Wharf, the canal passed over two aqueducts, went through a tunnel 3,000 yards (2,700 meters) long under ironworks at Bull Bridge, and included fourteen locks. Most of the canal’s cargo was coal and coke, with the rest being gritstone, iron ore, and lead. When the Derby and Nottingham Canals were completed by Jessop and Benjamin Outram in 1796, they created direct routes to the important textile centers of Derby and Nottingham. In January 1845, the Cromford Canal Company decided to build a permanent pump to ensure enough water during dry periods. This pump was made by Graham and Company at the Milton Iron Works, Elsecar. The canal remained successful until the mid-19th century, when the Manchester, Buxton, Matlock and Midlands Junction Railway extended its line south of the canal. In 1852, the canal was sold to the railway company, which caused its decline. By 1889, the canal was mostly used for local traffic. It was finally closed in 1944 because the cost of maintaining and repairing it became too high. Derbyshire County Council bought the canal in 1974, and the Cromford Canal Society worked to restore it.

In the early 19th century, a plan was proposed to connect the Peak Forest Canal, which ended at Whaley Bridge, with the Cromford Canal, creating a direct route between markets in Lancashire and Derbyshire. However, the cost was too high, and the plan was abandoned. Josias Jessop, the son of William Jessop, believed a wagonway would be cheaper than a canal. On 2 May 1825, an Act of Parliament was passed to build a railway from Cromford to Whaley Bridge. This proposal, supported by William Cavendish, 6th Duke of Devonshire, Richard Arkwright junior, and several Manchester bankers, aimed to use steam locomotives, even though the technology was not yet fully developed. The railway’s southern section, from Cromford Wharf to Hurdlow, opened on 29 May 1830, and the rest of the line opened to Whaley Bridge on 6 July 1831. The first steam locomotive on the line was introduced in 1841; before that, only wagons were used.

The railway rose from 277 feet (84 meters) above sea level at Cromford Wharf to 1,264 feet (385 meters) at Ladmanlow, then descended to 747 feet (228 meters) at the wharves of the Peak Forest Canal. These changes in height, which would have required many locks for a canal, were easier for a railway. For a time, the Cromford and High Peak Railway had the sharpest curve in Britain and the steepest incline for vehicles without steam power. The railway’s construction cost £180,000, more than the original estimate of £155,000 (£12 million and £11 million as of 2025), but much less than the £500,000 (£34 million as of 2025) predicted for the canal. The railway’s success was tied to the canals, but by the time it opened, traffic on the Cromford Canal had already declined. In 1855, an Act of Parliament allowed the railway to carry passengers as well as freight. Although passenger travel became more important, the railway eventually declined and closed on 21 April 1967.

Legacy

The Derwent Valley is known as the birthplace of the factory system. Machines like the water frame, developed in the valley, allowed for continuous production. Richard Arkwright's Cromford Mill and the nearby workers' settlement created a model for industrial communities, both in the valley and around the world. A settlement was built at the same time as Cromford Mill to provide housing for workers. Without homes for workers and their families, the mill could not get the labor it needed. Arkwright's success encouraged other industrialists to copy his ideas. Entrepreneurs like Peter Nightingale, Jedediah Strutt, and Thomas Evans built settlements such as Belper, Milford, and Darley Abbey in the Derwent Valley for their employees. Industrialists wanted to ensure a steady supply of workers, and they also showed care for their employees and families through a system called paternalism.

Arkwright's innovations included not only workers' settlements but also patents for water-powered spinning technologies. These inventions were so valuable that other industrialists tried to copy them, even risking legal action. Arkwright's patents ended in 1785, and by 1788, over 200 mills similar to his were built in Britain. New Lanark in Scotland, a World Heritage Site, was directly influenced by Arkwright and the developments in the Derwent Valley. David Dale and Arkwright visited Lanark in 1784 and identified it as a site for a mill. Dale later built four mills there, which were similar in structure to Arkwright's Masson Mill. At least two of these mills used technology from the Derwent Valley, though the factory system in Lanark was different. In 1799, Robert Owen took over New Lanark and expanded paternalism by introducing education for workers of all ages and improving social control. Saltaire, another World Heritage Site, was founded in 1853 and included worker housing, facilities, and other elements of Arkwright's factory system.

In 1774, the British government passed a law banning the export of tools used in the cotton and linen industries. This meant that new British technologies could only spread abroad through secret copying. Carl Delius, who worked in England, shared plans for Arkwright's inventions with Johann Gottfried Brugelmann. Brugelmann used this information to build a mill in Ratingen, near Düsseldorf, which started production in 1784. He named the settlement around the mill "Cromford," after Arkwright's mill. This was the first Arkwright-style mill in mainland Europe. The spinning techniques developed in the Derwent Valley also reached America. In 1790, the United States had fewer than 2,000 spindles powered by spinning jennies, compared to 2.4 million machine-driven spindles in Britain. Arkwright mills in America were introduced by English migrants, many of whom were unskilled. Samuel Slater, from the Derwent Valley and an apprentice of Jedediah Strutt, founded Slater Mill in Pawtucket, Rhode Island. Many technologies from the Derwent Valley Mills remained in use for other textile industries until the mid-20th century. The factory system made it possible to produce inexpensive textiles and clothing.

Preservation

The Arkwright Society was created in 1971 after the Arkwright Festival. In 1979, the society bought the Cromford Mill complex to protect the buildings from being destroyed. The charity purchased the site to preserve it and begin restoring it. The mills had been polluted by industrial materials like pigments and dyes that were stored there after the mill stopped making cotton. With help from local councils, the East Midlands Development Agency, English Heritage, the Heritage Lottery Fund, and a cost of £5 million, the mills were cleaned and restored. Today, Cromford Mill is used by small businesses and for education.

Many mills built in the Derwent Valley for the cotton industry still exist and were reused after the industry declined. Most of the homes once used by workers remain and are still used as homes. Between the 1970s and 1980s, local governments and English Heritage worked together to stop the mills and homes from falling into poor condition by offering advice and funding for repairs. When the area was nominated for World Heritage Site status in 2000, 26 of the 838 buildings listed in the region were in poor condition and on English Heritage's At Risk Register.

In 2000, the Derwent Valley Mills were nominated to become a World Heritage Site. Along with Blaenavon Industrial Landscape, New Lanark, and Saltaire (now all World Heritage Sites), the site was proposed to add more examples of industrial history to the list. The nomination was accepted, and the Derwent Valley Mills became a World Heritage Site in 2001. This status helps protect the site, as all World Heritage Sites are considered to have "outstanding value to humanity." The site was listed under the second and fourth Heritage Site selection criteria. The Derwent Valley Mills were among the first to develop worker housing and industrial technology created by Richard Arkwright, forming an industrial landscape that influenced the growth of industrial towns. The Derwent Valley Mills Partnership, on behalf of the British government, manages the site. In June 2009, Bath Street Mill in Derby was damaged by fire. This 18th-century building was part of the World Heritage Site.

In 2018, the "Cromford Mills Creative Cluster and World Heritage Site Gateway Project" was named a finalist for the "Best Major Regeneration of a Historic Building or Place" in the Historic England Angel Awards. In 2019, the Arkwright Society employed 100 people at the Cromford Mills site, and the total cost of restoration by that time was £48 million.

• Richard Arkwright's Masson Mill is now a working textile museum with the largest collection of bobbins in the world.
• Leawood Pumphouse is now a working museum that still pumps water from the Derwent to the Cromford Canal. It is open on selected weekends.
• At Belper, many areas of the site have been converted to other business uses. The Belper North Mill building houses the Derwent Valley Visitor Centre, which displays machinery and items related to the history of the Derwent Valley textile industry.
• At the southern end of the site, Lombe's Silk Mill now houses the Derby Industrial Museum. This museum closed on 3 April 2011 and was not used for over two years.
• In October 2013, a program began to update the silk mill for the 21st Century, using the principles of STEAM (Science, Technology, Engineering, Art, and Maths). The museum now opens four days a week.
• The Derby Industrial Museum was renamed the Museum of Making in November 2021. It displays exhibits about the history of the Derwent Valley Mills and the broader history of manufacturing.