The Old Slater Mill Association was organized in 1921 to preserve the mill as a museum with textile machinery and related artifacts. Restoration was completed by 1925 and the building soon housed an impressive array of industrial artifacts frequently displayed, but with little or no interpretation. By the early 1950s, the museum was opened on a regular basis with interpreted tours, demonstrations and an organized exhibit of textile machinery, and by 1966 Slater Mill was designated a National Historic Landmark by the National Park Service. In the 1970s, the Wilkinson Mill and Sylvanus Brown House were restored, additional acreage purchased, and the site renamed Slater Mill Historic Site and given status as a National Historic Landmark District.
The Old Slater Mill was dedicated exclusively to the production of cotton thread until 1829 and then continuously occupied until 1921 with various owners and renters who altered its physical structure to suit whatever enterprise they brought with them. Beginning with modest dimensions of 43" x 29", the mill was periodically enlarged, reaching its maximum of 140" x 51" in 1920. Through the years, production included jewelers' tools, coffin trimmings, cardboard and bicycles. The demise of the last private owner spurred a small group of local businessmen to organize the Old Slater Mill Association to purchase, restore and preserve the "Birthplace of the American Industrial Revolution" the Old Slater Mill. Between 1925 and 1930, the Association's efforts secured support from 62 individuals and gave them the honor of becoming "founders" of one of the first industrial museums in the United States. Industrial giants such as Henry Ford, Walter Chrysler and Harvey Firestone were not only early supporters of this early industrial museum, but went on to preserve their own industrial collections.
The Old Slater Mill Association's (OSMA) preservation efforts are unique in several important ways. The national preservation movement was still in its infancy after World War I. All historic preservation pre-dating World War I had been associated with prominent politicians or with the colonial and revolutionary periods of American history. Furthermore, women typically conducted preservation projects for the purpose of instilling civic virtue. The first Association members were businessmen who were closely tied to the textile industry and had witnessed its abandonment of the Northeast in favor of the cheap labor, cheap land and availability of raw materials in the South. Unable to halt the deterioration of the textile-based economy, they sought to preserve and protect the last vestige of their industrial heritage, the Old Slater Mill.
Today, Slater Mill is a museum complex which includes the Old Slater Mill, built in 1793, restored to its c. 1835 appearance; the Wilkinson Mill, built in 1810; the Sylvanus Brown House, built in 1758; archival materials; collections of hand-operated and powered machinery, a 120 seat theatre, 2 gift shops, a gallery and a recreational park. Interpretive programs examine the transition from home manufacture to factory production and the role of water and steam power in the industrial revolution. Slater Mill serves as an educational resource center for the community, the state, and the region. Each year, Slater Mill attracts a large and diverse audience with a range of educational programs designed for different ages and interests. Highlights of the site include a 17-minute film bringing to life the development of the city of Pawtucket through industrial development and the history of the Blackstone River Valley in general, demonstrations of flax processing, cotton spinning, weaving in an 18th century artisan's home, exhibitions of 19th and 20th century machinery, and an operating 16,000 pound water wheel. Trained interpreters discuss the transition from home to factory production, labor issues and products of an early textile factory, technological development and decline of textile manufacture.