Upper Missouri River Breaks

Upper Missouri River Breaks National Monument protects 377,346 acres of dramatic Missouri River canyon country in central Montana across Blaine, Chouteau, Fergus, and Phillips counties. The monument preserves the most visually stunning and historically significant stretch of the Missouri River, largely unchanged since Lewis and Clark passed through in 1805.

The monument supports elk, mule deer, bighorn sheep, and pronghorn. Mountain lions, bobcats, and coyotes are predators. The river provides habitat for paddlefish, sauger, and channel catfish. Golden eagles, prairie falcons, and ferruginous hawks nest on the cliffs.

The breaks support a mosaic of native grasslands, sagebrush, and pine-juniper woodlands on the canyon rims. Cottonwood galleries line the river. The varied terrain creates diverse plant communities from arid badlands to sheltered creek bottoms.

The Missouri River has carved deep canyons through Cretaceous-age sandstone and shale formations, creating the dramatic 'breaks' landscape. The White Cliffs section features eroded sandstone formations that Lewis described as 'seens of visionary inchantment.' Exposed formations span millions of years.

Central Montana experiences hot summers and very cold winters. Annual precipitation averages about 12 inches. The remote canyon country amplifies weather extremes. Summer temperatures can exceed 100°F while winter drops below -30°F.

The Lewis and Clark Expedition traveled this stretch in 1805-1806, and the landscape remains remarkably unchanged. Earlier inhabitants included various Native peoples. Steamboats plied the river in the 1800s, and scattered homesteads tell stories of attempted settlement.

Upper Missouri River Breaks National Monument was designated by President Clinton in 2001. The BLM manages the monument, which encompasses one of the largest and most intact sections of Lewis and Clark Trail landscape remaining.

The 149-mile Missouri River canoe trail from Fort Benton to the Fred Robinson Bridge is the premier attraction. The White Cliffs, Hole-in-the-Wall, and Dark Butte formations are iconic. The remote canyon country provides genuine wilderness experience.

The BLM interpretive center in Fort Benton provides trip planning. Designated campsites line the river. Most access is by boat. The monument is remote with limited road access along its borders.

The monument protects one of the most intact sections of the Lewis and Clark landscape. Managing motorized access while allowing traditional grazing use balances preservation with local economy. The river corridor requires ongoing stewardship.