Upper Missouri River National Historic Landmark District

Upper Missouri River National Historic Landmark District
Name	Upper Missouri River National Historic Landmark District
Location	North Dakota, Montana, United States
Area	~3,700,000 acres
Designation	National Historic Landmark District
Designated	1966

Upper Missouri River National Historic Landmark District is a nationally designated landscape that preserves an extensive series of river corridors, forts, trails, and Native American cultural sites along the upper stretches of the Missouri River in Montana and North Dakota. The district embodies intersections of Lewis and Clark Expedition, fur trade, Mandan people, Hidatsa people, and Blackfeet Confederacy histories and retains a remarkable concentration of archaeological sites, historic trails, and 19th‑century federal and commercial infrastructures.

Overview and Significance

The district encompasses landscape features and sites associated with the Lewis and Clark Expedition, the Corps of Discovery, the Fort Union Trading Post National Historic Site, the Mandan villages, and routes used by the Oregon Trail, Bozeman Trail, and Mormon Trail era movements. It is significant for its connections to individuals and institutions such as Meriwether Lewis, William Clark, Pierre-Jean De Smet, John Jacob Astor, and companies like the American Fur Company and the Hudson's Bay Company. The area also relates to federal policies and treaties including the Fort Laramie Treaty, interactions with military posts like Fort Buford and Fort Benton, and later conservation efforts led by organizations including the National Park Service and the National Historic Landmarks Program.

Geography and Boundaries

The district follows the upper Missouri and its major tributaries — notably the Yellowstone River, Little Missouri River, Knife River, and Milk River — across physiographic provinces such as the Great Plains and the Badlands (South Dakota and North Dakota). It spans counties in Richland County, Montana, Garfield County, Montana, McKenzie County, North Dakota, and adjacent jurisdictions, tying together riparian corridors, oxbow meanders, and exposed sedimentary formations associated with the Western Interior Seaway fossil record recognized by paleontologists like Edward Drinker Cope. Boundaries were drawn to include archaeological complexes, historic steamboat landings at Fort Benton, and the natural vistas that shaped exploratory narratives by John Colter and Alexander MacKenzie.

Historical Development

Precontact and historic periods within the district record occupations by the Mandan, Hidatsa, Arikara, Assiniboine, and Lakota peoples, as documented in ethnographies by Lewis Henry Morgan and fieldwork tied to archaeologists such as Ales Hrdlicka. European‑American penetration accelerated with the Lewis and Clark Expedition (1804–1806), followed by the growth of the fur trade in establishments like Fort Union and the arrival of steamboat commerce epitomized by the Yellowstone River boat traffic centered on Fort Benton. Military presence increased with posts including Fort Clark, Fort Buford, and Fort Abraham Lincoln during periods connected to events like the Sioux Wars and the Nez Perce War. Later 19th‑century developments included railroad expansion by companies such as the Northern Pacific Railway, agricultural settlement promoted under laws like the Homestead Act, and conservation initiatives culminating in recognition by the National Historic Landmarks Program.

Cultural and Archaeological Resources

The district contains earthlodge village sites, burial mounds, tipi rings, fur trade forts, steamboat landings, trail segments, and historic ranch complexes documented through investigations by institutions such as the Smithsonian Institution, the University of Montana, and the State Historical Society of North Dakota. Archaeological assemblages include ceramics, lithic tool scatters, and trade goods tied to networks linking the Mandans and Hidatsas with Euro‑American traders like Joseph La Barge. Ethnohistoric records reference ceremonies and gatherings involving leaders such as Sitting Bull, Chief Four Bears, and negotiators present at treaty councils under signatories like Henry M. Teller and William Tecumseh Sherman.

Natural Environment and Ecology

Riparian habitats support species and communities examined by ecologists and conservationists associated with organizations like the U.S. Fish and Wildlife Service and the Bureau of Land Management. The district includes grassland, cottonwood gallery forest, and riparian wetlands that provide habitat for migratory birds cataloged by ornithologists linked to the Audubon Society, mammals including American bison herds historically and modern reintroduction projects advocated by conservationists such as Theodore Roosevelt, and fish populations influenced by hydrological changes linked to projects overseen by the U.S. Army Corps of Engineers. Geological exposures record Cretaceous and Tertiary strata studied by geologists including Ferdinand Vandeveer Hayden and paleontologists from the American Museum of Natural History.

Management and Preservation

Management involves federal, tribal, state, and private stakeholders including the National Park Service, Bureau of Land Management, U.S. Fish and Wildlife Service, tribal governments of the Mandan, Hidatsa, and Arikara Nation, and state historical agencies. Preservation actions address cultural resource protection under statutes such as the National Historic Preservation Act and coordination through programs like the Historic American Landscapes Survey. Collaborative stewardship includes site monitoring, archaeological permitting through institutions like the National Council for Preservation Education, and land conservation efforts supported by entities such as the The Nature Conservancy.

Visitor Access and Interpretation

Public interpretation is available at associated sites and museums including Fort Union Trading Post National Historic Site, Lewis and Clark Interpretive Center, Fort Benton, and regional visitor centers operated by state historical societies. Recreational access is provided via river trips guided by outfitters, segments of the Lewis and Clark National Historic Trail, and hiking on public lands managed by the Bureau of Land Management. Educational programming involves partnerships with universities like the University of North Dakota, tribal education offices, and outreach by nonprofits such as Historic Fort Union Association.

Category:Historic districts in Montana Category:Historic districts in North Dakota