The Missouri River is the longest river in the United States. Rising in the Eastern Centennial Mountains of the Bitteroot Range of the Rocky Mountains of Southwestern Montana, the Missouri flows east and south for 2,341 miles (3,767 km) before entering the Mississippi River north of St. Louis, Missouri. The river drains a sparsely populated, semi-arid watershed of more than 500,000 square miles (1,300,000 km2), which includes parts of ten U.S. states and two Canadian provinces. Although a tributary of the Mississippi, the Missouri River is slightly longer and carries a comparable volume of water. When combined with the lower Mississippi River, it forms the world's fourth longest river system.
A natural arch, natural bridge, or rock arch is a natural landform where an arch has formed with an opening underneath. Natural arches commonly form where inland cliffs, coastal cliffs, fins or stacks are subject to erosion from the sea, rivers or weathering.
Fort Benton is a city in and the county seat of Chouteau County, Montana, United States. Established in 1846, Fort Benton is the oldest continuously occupied settlement in Montana. Fort Benton was the most upstream navigable port on the Mississippi River System, and is considered "the world’s innermost port".
The Yellowstone River is a tributary of the Missouri River, approximately 692 miles (1,114 km) long, in the Western United States. Considered the principal tributary of upper Missouri, via its own tributaries it drains an area with headwaters across the mountains and high plains of southern Montana and northern Wyoming, and stretching east from the Rocky Mountains in the vicinity of Yellowstone National Park. It flows northeast to its confluence with the Missouri River on the North Dakota side of the border, about 25 miles west of present-day Williston.
Cow Creek is a tributary of the Missouri River, approximately 35 miles (56 km) long, in north central Montana in the United States. Cow Creek rises in the southern foothills of the Bear Paw Mountains in western Blaine County and flows east and then south, joining the Missouri approximately 25 air miles (40 km) northeast of Winifred, Montana—or 22 miles (35 km) upstream from the Fred Robinson Bridge.
The Fort Peck Dam is the highest of six major dams along the Missouri River, located in northeast Montana in the United States, near Glasgow, and adjacent to the community of Fort Peck. At 21,026 feet (6,409 m) in length and over 250 feet (76 m) in height, it is the largest hydraulically filled dam in the United States, and creates Fort Peck Lake, the fifth largest artificial lake in the U.S., more than 130 miles (210 km) long, 200 feet (61 m) deep, and it has a 1,520-mile (2,450 km) shoreline which is longer than the state of California's coastline. It lies within the Charles M. Russell National Wildlife Refuge. The dam and the 134-mile-long (216 km) lake are owned and operated by the U.S. Army Corps of Engineers and exist for the purposes of hydroelectric power generation, flood control, and water quality management.
The Great Falls of the Missouri River are a series of waterfalls on the upper Missouri River in north-central Montana in the United States. From upstream to downstream, the five falls along a 10-mile (16 km) segment of the river are:
Mullan Road was the first wagon road to cross the Rocky Mountains to the Inland of the Pacific Northwest. It was built by U.S. Army troops under the command of Lt. John Mullan, between the spring of 1859 and summer 1860. It led from Fort Benton, which at the time was in the Dakota Territory, then Idaho Territory from July 1863, and into Montana Territory beginning in May 1864. The road eventually stretched all the way from Fort Walla Walla, Washington Territory, near the Columbia River to the navigational head of the Missouri River, which at the time was the farthest inland port in the world). The road previewed the route approximately followed by modern-day Interstate 15 and Interstate 90 through present-day Montana, Idaho, and Washington.
Upper Table Rock and Lower Table Rock are two prominent volcanic plateaus located just north of the Rogue River in Jackson County, Oregon, U.S. Created by an andesitic lava flow approximately seven million years ago and shaped by erosion, they now stand about 800 feet (240 m) above the surrounding Rogue Valley. The Table Rocks are jointly owned; The Nature Conservancy is responsible for 3,591 acres (1,453 ha), while the Bureau of Land Management is responsible for 1,280 acres (520 ha).
Black Eagle Dam is a hydroelectric gravity weir dam located on the Missouri River in the city of Great Falls, Montana. The first dam on the site, built and opened in 1890, was a timber-and-rock crib dam. This structure was the first hydroelectric dam built in Montana and the first built on the Missouri River. The dam helped give the city of Great Falls the nickname "The Electric City." A second dam, built of concrete in 1926 and opened in 1927, replaced the first dam, which was not removed and lies submerged in the reservoir. Almost unchanged since 1926, the dam is 782 feet (238 m) long and 34.5 feet (10.5 m) high, and its powerhouse contains three turbines capable of generating seven megawatts (MW) of power each. The maximum power output of the dam is 18 MW. Montana Power Company built the second dam, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014. The reservoir behind the dam has no official name, but was called the Long Pool for many years. The reservoir is about 2 miles (3.2 km) long, and has a storage capacity of 1,710 acre-feet (2,110,000 m3) to 1,820 acre-feet (2,240,000 m3) of water.
LaBarge Rock in Chouteau County, Montana is a dramatic landform in the shape of a large rock column or pillar, rising 150 feet (46 m) from waters' edge of the Missouri River. It was named in honor of Captain Joseph LaBarge, a steamboat captain who cruised the Missouri River in the mid nineteenth century. Besides having a striking appearance, LaBarge Rock is located in a picturesque riverside setting which has attracted artists and photographers over two centuries. Access is difficult; the pillar is located at Missouri River BLM mile-mark 56 in the White Cliffs section of the remote Missouri Breaks area of Montana. The pillar is composed of massive dark alkilik igneous rock, in striking contrast to the long white sandstone cliffs that form its backdrop. Because of the isolation of the Missouri Breaks area LaBarge Rock and the White Cliffs appear today much as they did when seen by Lewis and Clark in 1804 on the outward leg of their journey of exploration.
Cow Island lies in a left turning bend of the Missouri River, in the area known as the Missouri River Breaks. The island is formed by sediments that are seasonally washed out from the mouths of Cow Creek and Bull Creek, which enter the Missouri River just upstream from Cow Island. The island is about 1.2 miles long and averages about 150 yards in width. It is located in extreme northern Fergus County, but lies across the river from extreme southern Blaine County, to its east.
Camp Cooke also known as Fort Claggett was a U.S. Army military post on the Missouri River in Montana Territory. The camp was established on July 10, 1866, just upstream from the mouth of the Judith River by the 13th Infantry Regiment. By 1867 Camp Cooke had a strength of approximately 400 men. The army established the post to protect steamboat traffic en route to Fort Benton. The boats carried passengers and freight to supply swiftly growing boom towns at the site of rich gold strikes in the western mountains of the Montana Territory.
Grant Prince Marsh was a riverboat pilot and captain who was noted for his many piloting exploits on the upper Missouri River and the Yellowstone River in the Western United States from 1862 until 1882. He began working as a cabin boy in 1856, eventually becoming a captain, pilot, and owner in a career lasting over sixty years. During that time, he achieved an outstanding record and reputation as a steamboat captain, serving on more than 22 vessels. His piloting exploits became legendary and modern historians have referred to him as "possibly the greatest steamboat man ever", "possibly the greatest [steamboat pilot] ever", "possibly the finest riverboat pilot who ever lived", and "the greatest steamboat master and pilot on both the Missouri and Yellowstone Rivers".
The Benton Shale is a geologic formation name historically used in Montana, Wyoming, North Dakota, South Dakota, Colorado, Kansas, and Nebraska. In the "mile high" plains in the center of the continent, the named layers preserve marine fossils from the Late Cretaceous Period. The term Benton Limestone has also been used to refer to the chalky portions of the strata, especially the beds of the strata presently classified as Greenhorn Limestone, particularly the Fencepost limestone.
Tower Rock State Park is a state park near the community of Cascade in the U.S. state of Montana in the United States. The centerpiece of the park is Tower Rock, a 424-foot (129 m)-high rock formation which marks the entrance to the Missouri River Canyon in the Adel Mountains Volcanic Field. It was well known to Native Americans, and considered a sacred place by the Piegan Blackfeet. Tower Rock received its current name when Meriwether Lewis of the Lewis and Clark Expedition visited the site in 1805. Railroad and highway development in the late 1800s and 1900s skirted Tower Rock, but the landform itself remained pristine. The 87.2 acres (0.353 km2) encompassing Tower Rock was added to the National Register of Historic Places on March 18, 2002. The 140-acre (0.57 km2) Tower Rock State Park was created around the National Historic Site in 2004.
The Judith Landing Historic District is a historic district near Winifred, Montana which was listed on the National Register of Historic Places in 1975. It is large, 9,555 acres (38.67 km2) in size, spanning parts of Choteau and Fergus counties, including the confluences of the Judith River and Dog Creek into the Missouri River.
Joseph Marie LaBarge was an American steamboat captain, most notably of the steamboats Yellowstone, and Emilie, that saw service on the Mississippi and Missouri rivers, bringing fur traders, miners, goods and supplies up and down these rivers to their destinations. During much of his career LaBarge was in the employ of the American Fur Company, a giant in the fur trading business, before building his own steamboat, the Emilie, to become an independent riverman. During his career he exceeded several existing speed and distance records for steamboats on the Missouri River. Passengers aboard his vessels sometimes included notable people, including Abraham Lincoln. LaBarge routinely offered his steamboat services gratis to Jesuit missionaries throughout his career.
The Spread Eagle was a steam-driven sidewheel riverboat that transported passengers, goods and supplies to the forts and trading posts along the Missouri River between 1857–1864. It was constructed and launched at Brownsville, Pennsylvania. The vessel was a wooden hull packet, 210 feet (64 m) long, with a beam of 36 feet (11 m), a draft of 6 feet (1.8 m), and was rated at 389 tons. It was powered by two steam engines with 3 boilers each, at 40 inches (1,000 mm) in diameter and 24 feet (7.3 m) in length. The Spread Eagle was constructed by Captain Benjamin Johnson who sold the vessel to the American Fur Company upon her arrival at Saint Louis, Missouri. Commanded by captain Bailey, she was once engaged in a race along the Missouri from St. Louis to Fort Benton where she rammed her opponent.
The Emilie was a sidewheel steamer, designed, built and owned by the famed riverboat captain Joseph LaBarge, and used for trade and transporting people and supplies to various points along the Missouri River in the mid nineteenth century. The Emilie was built in Saint Louis in 1859, was 225 feet in length with a 32 foot beam and had a draft of six feet. Larger than the average riverboat at the time, she could carry 500 tons of cargo. During her extended service on the Missouri River she also fell into the hands of both Union and Confederate soldiers during the Civil War. As a result of her numerous exploits, Emilie was among the most famous boats on the river and was widely considered a first rate and an exceptionally beautiful riverboat. After some nine years of service the Emilie was caught in and destroyed by a tornado on June 4, 1868.
