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Upper Missouri River Breaks National Monument

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Containing a spectacular array of biological, geological, and historical objects of interest, the Upper Missouri River Break National Monument spans 149 miles of the Upper Missouri River, the adjacent Breaks country, and portions of Arrow Creek, Antelope Creek, and the Judith River. From Fort Benton to the Charles M. Russell National Wildlife Refuge, the monument includes six wilderness study areas, the Cow Creek Area of Critical Environmental Concern, segments of the Lewis and Clark National Historic Trail and the Nez Perce National Historic Trail, the Fort Benton National Historic Landmark, and more. The area was declared a National Monument in January, 2001.


Though largely unchanged in the more than 200 years since Meriwether Lewis and William Clark traveled through it on their epic journey in 1805, the valley of the Upper Missouri River is a living museum, the product of many events over time. About 90 million years ago, wide oceans, volcanoes, and dinosaurs existed in what is now Montana. Rivers continually carried sediment into the vast interior sea. These sediments of mud and silt were laid down in layers on the ocean floor. Over great periods of time, these sediments were compressed and formed into sedimentary rocks.





Upper Missouri River Breaks, Montana

Upper Missouri River Breaks by Bob Wick, Bureau of Land Management, 2012.

Image available for photo prints & downloads HERE.


Next came the glaciers. They pushed south into present-day Montana and forced the Missouri River into a new channel by carving through stone and sediment to re-route the flowing waters. As more time passed, flowing magma from prehistoric volcanoes hardened and formed into igneous rock while uplifts occurred on the ocean floor, causing the interior seaway to drain. These newly exposed landforms have been and still are subjected to rain, snow, wind, ice, and piercing heat. These climatic forces shaped the sedimentary and igneous rocks into extraordinary cliffs, canyons, pillars, and spires near the water’s edge creating the landform known as the Breaks. The black color of old volcanic features contrasts sharply with the lighter colored shale's and sandstones creating beautiful views along the river.


For thousands of years the Upper Missouri River area provided a home for many Native American tribes such as the Blackfoot, Gros Ventre, Assiniboine, and Crow. Other tribes traveled through and used the area, including the Shoshone, Cheyenne, Sioux, and Nez Perce. The Missouri River landscape, though sparse in appearance, provided many resources the tribes needed for daily living, including numerous types of plant and animal life. These tribes lived by following the tremendous herds of bison as the animals roamed the prairie. Other game species, such as elk and deer, also provided sustenance. Plants along the Missouri River, such as willow and snowberry, provided for and supplemented their nutritional and medicinal needs. These first peoples utilized the Missouri River as a path of trade and transport. In addition, the river and its tributaries formed tribal boundaries.


The center of Native American trade along the Missouri River was in the Dakotas region on its great bend. Here, a large cluster of walled Mandan, Hidatsa and Arikara villages situated on bluffs and islands was home to thousands of people and would later serve as a market and trading post used by early French and British explorers and fur traders.


The first Europeans encountered the river in the late 17th century, and the region passed through Spanish and French hands before finally becoming part of the United States through the Louisiana Purchase. Following the introduction of horses to Missouri River tribes the natives' way of life changed dramatically. The use of the horse allowed them to travel greater distances, and thus facilitated hunting, communications and trade.


As a route of western expansion, the Missouri River had few equals. Lewis and Clark spent three weeks, from May 24 through June 13, 1805, exploring the segment that is now the Upper Missouri National Wild and Scenic River. Today this portion is considered to be the premier component of the Lewis & Clark National Historic Trail. Captain William Clark wrote about the badlands saying,


"This country may with propriety, I think, be termed the Deserts of America, as I do not conceive any part can ever be settled, as it is deficient in water, timber, and too steep to be tilled." On May 31, 1805, the Corps camped at Stonewall Creek (present-day Eagle Creek) where Lewis remarked in his journal about the sandstone white cliffs along the river. "The hills and river cliffs, which we passed today exhibit a most romantic appearance . . ." and described " . . . elegant ranges of lofty freestone buildings, having their parapets well stocked with statuary . ." and ". . . scenes of visionary enchantment. . ." 




On June 2, 1805, the Corps reached the confluence of the Missouri with another river which they named Maria’s River in honor of Lewis’s cousin (today the river is called Marias, pronounced as Mah-rye-us). At this point, they had to decide which river was the true Missouri. Therefore, the site, near Loma, Montana, is known as Decision Point. On June 3, Lewis wrote in his journal:

This morning early we passed over and formed a camp on the point formed by the junction of the two large rivers… An interesting question was now to be determined; which of these rivers was the Missouri . . . Capt. C & myself strolled out to the top of the heights in the fork of these rivers from whence we had an extensive and most enchanting view; the country in every direction around us was one vast plain in which innumerable herds of Buffalo were seen attended by their sheperds the wolves; the solitary antelope which now had their young were distributed over it’s face; some herds of Elk were also seen; the verdure perfectly clothed the ground, the weather was pleasant and fair. . "


They spent days at the mouth of the Marias River trying to resolve the dilemma of which river to follow. Through exploration, river observations, and the captains’ educational background, Lewis and Clark determined in slightly more than a week which river was the correct one, and therefore, which route to take. They took the southern route. This decision took the explorers in the right direction as they continued on to the Pacific Ocean.


Lewis and Clark with Sacagawea, guiding them.

Lewis and Clark with Sacagawea, guiding them, by E.S. Paxton.

Image available for photo prints & downloads HERE.


During the years following the passage of the Lewis and Clark Expedition, the Blackfoot Indians showed such an uncompromising hatred for Europeans that the tribe effectively prevented the penetration of their territory by trappers. However, the American Fur Company was finally successful in opening the upper river to trade in 1831. In that year they established Fort Piegan at the mouth of the Marias River. The following year they moved eight miles up river and established Fort McKenzie. The Missouri River soon became one of the main routes for the westward expansion, with the growth of the fur trade laying much of the groundwork as trappers explored the region and blazed trails. Pioneers headed west en masse beginning in the 1830s, first by covered wagon, then by the growing numbers of steamboats entering service on the river. Former Native American lands in the watershed were taken over by settlers, leading to some of the most longstanding and violent wars against indigenous peoples in American History.



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