Fort Henry on the Missouri River
Fort Henry on the Missouri River, located at the mouth of the Yellowstone where it enters the Missouri, was established on October 1, 1822 by a party of men led by Major Andrew Henry, who mounted the expedition for the purpose of establishing a fur trade outpost for an area which now encompasses most of Montana, western North Dakota, parts of Wyoming, into Canada. The site of the fort, which was abandoned in 1823, is approximately 20 miles (32 km) southwest of Williston, North Dakota near the Montana - North Dakota state line.
Other short-lived forts were established by Henry on his earlier expedition with the Missouri Fur Company. In the spring of 1810, the first Fort Henry was built at the Three Forks of the Missouri River near-present day Three Forks, Montana, but was abandoned shortly thereafter. A second Fort Henry was established during the fall of 1810 on Henry's Fork of the Snake River in present-day southeastern Idaho; it was abandoned in 1811.
- Brown, Mark H. (1969). The Plainsmen of the Yellowstone: A History of the Yellowstone Basin. Lincoln, Neb.: University of Nebraska Press. p. 64.
- National Park Service (2011). "Andrew Henry". Retrieved 6 August 2011.
- Fort Wiki: Fort Henry (1)
- W. Raymond Wood. First Post in the Far West: (November 1807 – March 1813). Discovering Lewis & Clark. (See Figure 6)
- Fort Wiki: Fort Henry (2)
- Lohse, E. S. (1993). "Southeastern Idaho Native American Prehistory and History". Manual for Archaeological Analysis: Field and Laboratory Analysis Procedures. Department of Anthropology Miscellaneous Paper No. 92-1 (revised). Pocatello: Idaho Museum of Natural History.