Missouri River

Rising in the Rocky Mountains of western Montana, the Missouri flows east and south for 2341 mi before entering the Mississippi River north of St. Louis, Missouri.

The Missouri River, after which the state is named, flows through the center of the state into the Mississippi River, which makes up Missouri's eastern border.

Rising in the Rocky Mountains of western Montana, the Missouri flows east and south for 2341 mi before entering the Mississippi River north of St. Louis, Missouri.

In the 19th century, during the height of the ideology of manifest destiny, the Mississippi and several western tributaries, most notably the Missouri, formed pathways for the western expansion of the United States.

Although the lower Missouri valley is now a populous and highly productive agricultural and industrial region, heavy development has taken its toll on wildlife and fish populations as well as water quality.

The Missouri River Valley outlines the journey of the Missouri River from its headwaters where the Madison, Jefferson and Gallatin Rivers flow together in Montana to its confluence with the Mississippi River in the State of Missouri.

The flooding along the Missouri which began during the spring 2019 Midwestern U.S. floods is expected to persist through the winter.

The Midwestern United States has been experiencing major floods since mid-March 2019, primarily along the Missouri River and its tributaries in Nebraska, Missouri, South Dakota, Iowa, and Kansas.

When combined with the lower Mississippi River, it forms the world's fourth longest river system.

It then winds east through a scenic region of canyons and badlands known as the Missouri Breaks, receiving the Marias River from the west then widening into the Fort Peck Lake reservoir a few miles above the confluence with the Musselshell River.

The Musselshell River is a tributary of the Missouri River, 341.9 mi long from its origins at the confluence of its North and South Forks near Martinsdale, Montana to its mouth on the Missouri River.

It then winds east through a scenic region of canyons and badlands known as the Missouri Breaks, receiving the Marias River from the west then widening into the Fort Peck Lake reservoir a few miles above the confluence with the Musselshell River.

The Marias River is a tributary of the Missouri River, approximately 210 mi (338 km) long, in the U.S. state of Montana.

Flowing eastward through the plains of eastern Montana, the Missouri receives the Poplar River from the north before crossing into North Dakota where the Yellowstone River, its greatest tributary by volume, joins from the southwest.

The Yellowstone River is a tributary of the Missouri River, approximately 692 mi long, in the western United States.

Farther on, the river passes through the Fort Peck Dam, and immediately downstream, the Milk River joins from the north.

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.

The Missouri River officially starts at the confluence of the Jefferson and Madison in Missouri Headwaters State Park near Three Forks, Montana, and is joined by the Gallatin a mile (1.6 km) downstream.

Missouri Headwaters State Park is a Montana state park that marks the official start of the Missouri River.

Rising in the Rocky Mountains of western Montana, the Missouri flows east and south for 2341 mi before entering the Mississippi River north of St. Louis, Missouri.

East of the divide the Missouri River, which is formed by the confluence of the Jefferson, Madison, and Gallatin Rivers near Three Forks, flows due north through the west-central part of the state to Great Falls.

The Missouri then meanders east past Williston and into Lake Sakakawea, the reservoir formed by Garrison Dam.

Garrison Dam is an earth-fill embankment dam on the Missouri River in central North Dakota, U.S..

Flowing eastward through the plains of eastern Montana, the Missouri receives the Poplar River from the north before crossing into North Dakota where the Yellowstone River, its greatest tributary by volume, joins from the southwest.

The Poplar River is a tributary of the Missouri River, approximately 167 mi long in Saskatchewan in Canada and Montana in the United States.

Flowing eastward through the plains of eastern Montana, the Missouri receives the Poplar River from the north before crossing into North Dakota where the Yellowstone River, its greatest tributary by volume, joins from the southwest.

The western half of the state consists of the hilly Great Plains as well as the northern part of the Badlands, which are to the west of the Missouri River.

It then proceeds to form the boundary of South Dakota and Nebraska, then after being joined by the James River from the north, forms the Iowa–Nebraska boundary.

Iowa is a state in the Midwestern United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west.

The Missouri makes a bend to the southeast as it winds through the Great Plains, receiving the Niobrara River and many smaller tributaries from the southwest.

The Niobrara River (, literally "water spread-out horizontal-the" or "The Wide-Spreading Water") is a tributary of the Missouri River, approximately 568 mi long, running through the U.S. states of Wyoming and Nebraska.

Below the dam the Missouri receives the Knife River from the west and flows south to Bismarck, the capital of North Dakota, where the Heart River joins from the west.

The Heart River is a tributary of the Missouri River, approximately 180 mi long, in western North Dakota, United States.

It then proceeds to form the boundary of South Dakota and Nebraska, then after being joined by the James River from the north, forms the Iowa–Nebraska boundary.

It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwest; and Wyoming to the west.

It then passes through Canyon Ferry Lake, a reservoir west of the Big Belt Mountains.

Canyon Ferry Lake is a reservoir on the Missouri River near Helena, Montana and Townsend, Montana.

It slows into the Lake Oahe reservoir just before the Cannonball River confluence.

The Cannonball River is a tributary of the Missouri River, approximately 135 mi (217 km) long, in southwestern North Dakota in the United States.

While it continues south, eventually reaching Oahe Dam in South Dakota, the Grand, Moreau and Cheyenne Rivers all join the Missouri from the west.

The Grand River is a tributary of the Missouri River in South Dakota in the United States.

While it continues south, eventually reaching Oahe Dam in South Dakota, the Grand, Moreau and Cheyenne Rivers all join the Missouri from the west.

The state is bisected by the Missouri River, dividing South Dakota into two geographically and socially distinct halves, known to residents as "East River" and "West River".

While it continues south, eventually reaching Oahe Dam in South Dakota, the Grand, Moreau and Cheyenne Rivers all join the Missouri from the west.

The Oahe Dam is a large earthen dam on the Missouri River, just north of Pierre, South Dakota, United States.

At Sioux City the Big Sioux River comes in from the north.

The Big Sioux River is a tributary of the Missouri River, 419 miles (674 km) long, in eastern South Dakota and northwestern Iowa in the United States.

It then proceeds to form the boundary of South Dakota and Nebraska, then after being joined by the James River from the north, forms the Iowa–Nebraska boundary.

The James River (also known as the Jim River or the Dakota River) is a tributary of the Missouri River, approximately 710 miles (1,140 km) long, draining an area of 20,653 square miles (53,490 km 2 ) in the U.S. states of North Dakota and South Dakota.