Ruins of the mill operated by the Marine Lumber Company at Marine Mills (Marine on St. Croix) between 1839 and 1895. Photograph by John Cross for the Minnesota Historical Society, ca. 2010s.

Ruins of the mill operated by the Marine Lumber Company at Marine Mills (Marine on St. Croix) between 1839 and 1895. Photograph by Wikimedia Commons user MacGhiever, June 8, 2008. GNU Free Documentation License.

Ruins of the mill operated by the Marine Lumber Company at Marine Mills (Marine on St. Croix) between 1839 and 1895, ca. 1940. Photograph by John Cross.

Marine on St. Croix. Photograph by Monroe P. Killy, June 19, 1932.

Ruins of the mill operated by the Marine Lumber Company at Marine Mills (Marine on St. Croix) between 1839 and 1895, photographed ca. 1900.

The sawmill operated by Walker, Judd & Veazie at the town of Marine Mills (later renamed Marine on St. Croix), ca. 1880.

The sawmill operated by Walker, Judd & Veazie at the town of Marine Mills (later renamed Marine on St. Croix), ca. 1880.

The sawmill operated by Walker, Judd & Veazie at the town of Marine Mills (later renamed Marine on St. Croix), ca. 1882.

Fergus Falls Regional Treatment Center, formerly Fergus Falls State Hospital. Photograph by Wikimedia Commons user HRS, August 20, 2019. CC BY-SA 4.0

An aerial view of the reconstructed Snake River Fur Post in winter, ca. 1970.