Missouri River Breaks

The Upper Missouri River Breaks National Monument, in north-central Montana between Fort Benton and the Charles M. Russell National Wildlife Refuge, preserves 375,000 acres of the most spectacular and least-known river-canyon landscape in the American West — the rugged, eroded badlands and white Eagle Creek sandstone cliffs that line the Upper Missouri Wild and Scenic River corridor, a 149-mile stretch of the Missouri that looks almost exactly as Meriwether Lewis described it in 1805: “the most beautiful scenery I ever beheld.”

The Upper Missouri is the longest free-flowing and least-altered stretch of the Missouri River remaining in the United States — a remarkable preservation of the landscape the Corps of Discovery traveled through in May and June of 1805. The monument is remote, uncrowded, and accessible primarily by float trip (canoe or kayak on the Missouri) or by gravel road, making it one of the finest wilderness river experiences in the American West for visitors willing to embrace its remoteness.

May through mid-June is the finest season for the Missouri River float — the river is at a good paddling level (snowmelt provides good flow), the weather is still cool (ideal for multi-day camping), the cottonwoods along the river have just leafed out in brilliant green, and the wildlife (including the pelican colony) is at its most active. Late September and October are excellent for the fall color (the cottonwood corridor turns gold) and for elk and deer movement. Summer (July and August) is hot (90-100°F) and the river level drops — paddling is slower and sun exposure on the open river is intense; bring serious sun protection. The monument is open year-round but the river float is best May-June and September-October. Spring for the float and fall for the foliage are the recommendations.

The Upper Missouri River Breaks corridor is one of the most historically significant landscapes in the American West — Meriwether Lewis’s journal entries from May 1805 (as the Corps of Discovery ascended the Missouri through the Breaks) contain some of the most lyrical descriptions of American landscape ever written, including his famous description of the white sandstone formations as “scenes of visionary enchantment.” The Breaks were the homeland of the Blackfeet, Assiniboine and Gros Ventre peoples; the Cow Island crossing (northeast of the monument, on the Missouri) was the site of the final significant military engagement of the Nez Perce War in September 1877. The buffalo robe trade era (1840s-1870s) saw bull-boat and steamboat traffic through the Breaks. The Upper Missouri was designated a Wild and Scenic River in 1976; the monument was established by President Clinton in 2001 under the Antiquities Act.

The Missouri River Breaks expose a remarkable sequence of Cretaceous sedimentary rocks — primarily the Eagle Creek Sandstone (Campanian, approximately 75-80 million years old), a white to cream-colored marine sandstone that forms the dramatic cliff faces, spires and alcoves lining the Missouri River corridor; and the underlying Claggett and Judith River Formations (also Cretaceous), which yield significant fossil material including hadrosaur and ceratopsian dinosaur bones. The Breaks landscape was formed by the Missouri River’s entrenching into the Cretaceous rocks as the land rose during the Laramide orogeny, followed by subsequent erosion of the soft shales and harder sandstone layers into the characteristic badlands coulee-and-cliff landscape. The white Eagle Creek Sandstone cliffs that Lewis described as “visionary enchantment” are the defining geological feature of the monument.

The Upper Missouri River Breaks NM supports one of the finest wildlife communities in Montana’s high plains — bighorn sheep (a significant herd visible on the cliff faces and talus slopes along the river; commonly seen from canoes), mule deer (abundant throughout the Breaks), pronghorn (on the plateau above the breaks), white-tailed deer (in the cottonwood riparian corridor), American white pelicans (the Missouri River supports one of the largest white pelican nesting colonies in Montana; flocks of 50-100+ birds are frequently seen fishing the river), great blue herons, common mergansers, belted kingfishers, osprey, golden eagles (nesting on the sandstone cliffs), prairie falcons, peregrine falcons, and the occasional grizzly bear (the monument is near the southern range limit of the northern Great Plains grizzly population). The bighorn sheep, pelicans and golden eagles are the defining wildlife encounters.

The Upper Missouri River Breaks NM’s most significant ecological feature is the Missouri River cottonwood riparian corridor — one of the longest and most intact native cottonwood forests in the Great Plains, providing critical nesting and migration stopover habitat for songbirds, raptors and wading birds along the Great Plains flyway. The river’s naturally variable flow (undammed in this reach) supports the native cottonwood forest regeneration process — cottonwood seeds require bare, moist riverbank sediment to germinate, which only the natural spring flood pulse provides. Invasive tamarisk and Russian olive are present in the Breaks and are managed by BLM. The bighorn sheep herd and the pronghorn herds on the plateau above the Breaks are critical populations for the northern Great Plains ecosystem.

The Upper Missouri River Breaks NM holds a unique and irreplaceable place in the heritage of the American West — the most historically significant river corridor in Montana (the Corps of Discovery’s 1805 passage; Meriwether Lewis’s most celebrated journal descriptions), the longest undammed and least-altered stretch of the Missouri River remaining in the United States, one of the finest wilderness float trips in the American West, and a landscape of extraordinary geological beauty that receives only a small fraction of the visitation of more famous monuments. Its combination of Lewis and Clark history, wildlife abundance, river wilderness and remoteness makes it exceptional. The Missouri River Breaks are a treasured natural and historical monument of Montana.

The Upper Missouri River Breaks NM is remote and accessible primarily by float trip and gravel road. The primary float trip access is at Fort Benton, Montana (the historic steamboat landing, about 40 miles northeast of Great Falls on US-87) — the float takeout is typically at the Fred Robinson Bridge (US-191, about 60 miles north of Lewistown). Great Falls (the largest city in the region, 40 miles southwest of Fort Benton) has full services. The BLM Lewistown Field Office manages the monument and provides float trip planning resources (waterproof maps, camping regulations and river conditions). Canoe and kayak rentals and shuttle services are available through commercial outfitters in Fort Benton. The Cow Island Recreation Area (a drive-in access point on the Missouri, via gravel road from Malta) provides an alternate access point. Check BLM for current river conditions and any special use requirements before visiting.

The Bureau of Land Management manages the Upper Missouri River Breaks NM. The free-flowing Missouri River corridor is the monument’s most critical conservation feature — protecting the river’s natural flow regime, water quality and native cottonwood forest from upstream diversions and riparian degradation is the primary management priority. Invasive plant management (tamarisk, Russian olive, leafy spurge) is ongoing. Visitors on the float trip must follow Leave No Trace principles rigorously: pack out all human waste (a WAG bag or portable toilet system is required — BLM mandates carry-out human waste on the Wild and Scenic River); pack out all trash; use fire pans for campfires and remove all ash. Camp in previously used sites to minimize new impact. Report any invasive plant infestations or archeological disturbance to BLM.

The Missouri River float trip is a multi-day backcountry experience in a remote, roadless corridor — self-sufficiency is essential. Carry a comprehensive first-aid kit, a satellite communicator (no cell service in the Breaks), 7+ days of food and water treatment capability, detailed waterproof maps (download USGS topo maps before launch), and a WAG bag system. The river is Class I-II (generally calm), but strong winds (common on the Missouri in the Breaks) can make paddling difficult and waves large enough to swamp an open canoe. Summer heat (90-100°F) requires serious sun protection, adequate water (purify river water before drinking), and heat-illness awareness. Prairie rattlesnakes are common on shore; check your campsite carefully before setting up. The monument’s remoteness (no road access for 80+ miles in the float corridor) means any emergency requires self-rescue or satellite rescue activation.

No entrance fee. Float trip on the Wild and Scenic Missouri: carry-out human waste required (WAG bag or portable toilet system; no burying human waste on the river corridor). Campfire allowed in a fire pan only; remove all ash. Camp in previously used sites. No motorized boats in the designated float segments (check BLM for current motorized restrictions). Archeological sites (pictographs, tipi rings, homestead remains) are protected — do not touch, disturb or collect any artifact. Fishing requires a Montana fishing license (check MFWP for current regulations). Check BLM for current fire restrictions, camping regulations and float permit requirements before launching.

Fort Benton, Montana (the launch point — one of the most historically significant small towns in Montana, with the Museum of the Upper Missouri, the Lewis and Clark National Historic Trail Interpretive Center in Great Falls, and the original steamboat landing on the Missouri), Great Falls (40 miles southwest of Fort Benton — the largest city in north-central Montana, with the excellent Lewis and Clark National Historic Trail Interpretive Center — the finest Lewis and Clark museum in Montana), the Charles M. Russell National Wildlife Refuge (downstream from the monument — one of the largest national wildlife refuges in the Lower 48, with exceptional elk, deer and bighorn sheep populations), and Malta, Montana (northern gateway to the monument via gravel road) define the region.

Hire a commercial outfitter in Fort Benton for your first Missouri Breaks float — they provide canoe rental, shuttle service, waterproof river maps, float permit coordination and invaluable local knowledge about river conditions, camping spots and wildlife viewing. Download the BLM’s Missouri River float guide before your trip and identify the 5-6 prime campsites along the route (the cottonwood-grove campsites at the bases of the white sandstone cliffs, with the pelicans fishing the river at dawn, are among the finest camp experiences in the American West). Float in May or early June for the finest conditions — the cottonwoods are in fresh leaf, the river is at good level, and the temperature is ideal for paddling. Lewis’s journal (available free online from the American Philosophical Society) is the finest companion reading for the trip.