Isaac Staples' Sawmill, Industrial heritage site in Stillwater, Minnesota.

Isaac Staples' Sawmill consists of two buildings at Stillwater: an 1850 limestone powerhouse with an 80-foot smokestack, and a four-story metal-clad factory erected in 1900 beside it. The powerhouse is the only surviving industrial building tied to Isaac Staples, and the complex is listed on the National Register of Historic Places as St. Croix Lumber Mills—Stillwater Manufacturing Company.

The mill was built in 1850 and later purchased by Isaac Staples in 1869 who operated it for lumber production. A major fire in the 1890s destroyed the wooden structures but left the stone powerhouse standing, which continued to be used for different industrial purposes.

The site reflects how water-powered mills shaped the growth of Stillwater and connected the community to the lumber trade. Today it stands as a place where industrial purpose transformed into everyday commercial and residential use.

The complex is easy to locate on North Main Street and visible from the street, making it convenient to stop by while exploring downtown Stillwater. The buildings now contain shops and apartments so visitors can observe the exterior architecture and interior conversions without special access.

The 1894 fire destroyed every wooden mill structure on the site, leaving only the limestone powerhouse with its 80-foot smokestack. The Stillwater Manufacturing Company, a Minnesota Thresher Company subsidiary that made doors, window blinds and window sashes, then built the four-story metal-sided factory beside it in 1900. The two buildings therefore record two different construction eras in one lot.