Square Lake (Washington County, Minnesota)

Arcola is an unincorporated community in May Township, Washington County, Minnesota, United States. Arcola is located in the southeast part of May Township along State Highway 95 (MN 95). The northeast part of Stillwater Township is also in the immediate area. Nearby places include Stillwater and Marine on St. Croix. Arcola was first settled circa 1847. The John and Martin Mower House and Arcola Mill Site, around which the community was founded, is listed on the National Register of Historic Places.

Arcola Mills is a historic house in the unincorporated community of Arcola, Minnesota, United States. Built in 1847, it is considered the third-oldest and largest all-wood-frame house still standing in Minnesota. It was the home of brothers Martin and John Mower, who established one of the first sawmills on the St. Croix River and the community around it. The house and the remnants of the nearby mill were listed on the National Register of Historic Places in 1980 as the John and Martin Mower House and Arcola Mill Site for having local significance in the themes of architecture, exploration/settlement, and industry. The property was nominated as an "excellent example" of Greek Revival architecture and for its association with the region's early settlement and lumber industry. The property now operates as a non-profit event and education center.

The Soo Line High Bridge, also known as the Arcola High Bridge, is a steel deck arch bridge over the St. Croix River between Stillwater, Minnesota and Somerset, Wisconsin, United States. It was designed by structural engineer C.A.P. Turner and built by the American Bridge Company from 1910 to 1911. The bridge was listed on the National Register of Historic Places in 1977 for its national significance in the themes of engineering and transportation. It was nominated for its exceptional dimensions, beauty, innovative engineering techniques, and importance to transportation between Minnesota and Wisconsin.

The St. Croix Boom Company House and Barn is a historic residence in Stillwater Township, Minnesota, United States, built circa 1885. It was listed on the National Register of Historic Places in 1980 for its local significance in the theme of industry. It was nominated as the only known standing building associated with the St. Croix Boom Company, which operated a log boom critical to Minnesota's logging industry from 1856 to 1914.

The St. Croix Boom Site is a historic and scenic wayside on the St. Croix River in Stillwater Township, Minnesota, United States. It commemorates the location of a critical log boom where, from 1856 to 1914, timber from upriver was sorted and stored before being dispatched to sawmills downstream. The site was developed as a roadside park along Minnesota State Highway 95 in the 1930s. In 1966 it was designated a National Historic Landmark for its national significance in the theme of industry. It was nominated for being the earliest, most important, and longest serving of the log storage and handling operations that supported Minnesota's major logging industry. Virtually no traces remain of the site's original buildings and structures.

Stillwater Township is a township in Washington County, Minnesota, United States. The population was 2,553 at the 2000 census.

The Pest House in Stillwater Township, Minnesota, United States, is a former quarantine facility used by the city of Stillwater circa 1872 to 1910. It is a rare surviving example of a pest house, a common public health strategy of the late 19th and early 20th centuries, where people with contagious diseases were isolated. It was listed on the National Register of Historic Places in 1980 for having local significance in the theme of health/medicine. The original three-room Pest House has been converted into a private residence, with the addition of a porch on the southeast and a rear wing to the northwest.

The Gateway Trail Iron Bridge is a historic camelback truss bridge on the Gateway State Trail in Stillwater Township, Minnesota, United States. The bridge has stood in three locations in Minnesota. Its main span was built of wrought iron in 1873—before steel became the preferred material for metal bridges—and erected in Sauk Centre in Central Minnesota. Designated Bridge No. 5721, it was refurbished and moved in 1937 to rural Koochiching County in northern Minnesota, where it became known as the Silverdale Bridge. It was relocated to its present site in east-central Minnesota in 2011 and renamed Bridge No. 82524. It was listed on the National Register of Historic Places in 1998 for its state-level significance in engineering. It was nominated as a rare example of a wrought iron truss bridge with ornamental detailing.

The Point Douglas–St. Louis River Road Bridge, built in 1865, is the second oldest known stone arch bridge in the state of Minnesota after Sibley's Ferry Bridge in Mendota, which was built in 1864. It was constructed in Stillwater Township to carry the Point Douglas to Superior Military Road over Brown's Creek. The bridge was listed on the National Register of Historic Places in 1975 for having local significance in the themes of engineering and transportation. It was nominated as an example of stone engineering and as a remnant of Minnesota's early government roads.

The Henry Stussi House is a historic Gothic Revival house in Stillwater Township, Minnesota, United States, dating to the late 1870s. It was listed on the National Register of Historic Places in 1982 for its local significance in the themes of architecture and commerce. It was nominated for being one of Washington County's finest rural houses, and for its association with a notable figure in the local milling industry and ice trade.

The Minnesota Territorial Prison, later the Minnesota State Prison, was a prison in Stillwater, Minnesota, United States, in operation from 1853 to 1914. Construction of the prison began in 1851, shortly after Minnesota became a territory. The prison was replaced by the Minnesota Correctional Facility – Stillwater in nearby Bayport. Most of the original prison's structures were demolished in 1936, leaving only the 1853 Warden's House and a manual labor complex that had been constructed 1884–1898. The surviving factory buildings were listed on the National Register of Historic Places in 1982 for having state-level significance in the themes of industry and social history. The historic site, long since unused, was destroyed by arson on September 3, 2002. It was formally delisted from the National Register in 2005.