The Yellowstone River is a big river. 

The Yellowstone River is a very long river. 


The Yellowstone River is a very long river. 



The Yellowstone River is a major river in the Western United States. It is a large part of the Missouri River system. The river begins in the mountains of northwestern Wyoming. It starts where the North Fork and South Fork meet. The North Fork flows from Younts Peak. The South Fork flows from the slopes of Thorofare Mountain. The river flows through many different types of land. It moves from high mountains down to the flat plains. 
Water moves through the river in a very interesting way. It flows north through Yellowstone National Park first. It drains Yellowstone Lake and drops over two big waterfalls. These are the Upper and Lower Yellowstone Falls. The water then moves through the Grand Canyon of the Yellowstone. 

Many different people have given the river names over time. The Minnetaree name means "Yellow Rock River." French trappers called it Roche Jaune. The Cheyenne people called it the Yellow Rocks River. In 1805, Lewis and Clark recorded the English name. In 1806, William Clark explored the river. He even gave a name to the Clark's Fork. Later, a captain named Grant Marsh named many landmarks. He named places like Chimney Rock and Diamond Island. He named others after his friends or family members.
History shows that the river was a busy place. Native American tribes like the Crow and Sioux hunted here. In the 1860s, gold was found in Montana. This brought many people to the area using trails. Later, settlers used riverboats to travel the water. This time was often difficult for Native American tribes. There were many conflicts over the land and resources. Eventually, the Northern Pacific Railroad was built near the river in 1883.
Today, the Yellowstone River is used in many ways. People love to go fly fishing in its upper parts. 

The Yellowstone River is a major tributary of the Missouri River. It is located in the Western United States. This river serves as the principal tributary for the upper Missouri River. It drains a massive area through its own network of smaller rivers. These headwaters begin in the mountains and high plains of southern Montana and northern Wyoming. The river flows northeast toward the North Dakota border. It eventually meets the Missouri River west of the city of Williston.
The river's journey begins in the Absaroka Range of northwestern Wyoming. It sits on the Continental Divide in southwestern Park County. The river forms where the North Fork and the South Fork converge. The North Fork is the larger of these two branches. It flows from Younts Peak. The South Fork starts on the southern slopes of Thorofare Mountain. From here, the water flows north through Yellowstone National Park. It drains Yellowstone Lake and drops over the Upper and Lower Yellowstone Falls. These falls sit at the head of the Grand Canyon of the Yellowstone. 
After leaving the Grand Canyon, the river enters the Black Canyon of the Yellowstone. It then moves north into Montana. The river travels through the Paradise Valley between the northern Absaroka Range and the Gallatin Range. 

Many different names have described this river throughout history. The Minnetaree name, Mi tse a-da-zi, means "Yellow Rock River." Some believe this refers to yellow rocks in the Grand Canyon of the Yellowstone. Others suggest it refers to yellow sandstone bluffs on the lower river. The Cheyenne people called it Mo'éheo'hé'e, or Yellow Rocks River. The Crow people called it E-chee-dik-karsh-ah-shay, meaning Elk River. French trappers used the name Roche Jaune. In 1805, Lewis and Clark recorded the English translation. In 1806, William Clark explored the river and named the Clark's Fork. Later, Captain Grant Marsh named many landmarks during an 1873 expedition. He named places like Chimney Rock and Diamond Island. He also named islands after his family and friends.
The Yellowstone River has a complex history of human activity. Native American tribes like the Lakota Sioux, Crow, and Cheyenne used the region for summer hunting. In the 1860s, gold was discovered near Virginia City, Montana. This led to the use of the Bozeman and Bridger Trails. European-American settlers later used riverboats for transportation. This expansion led to conflicts such as Red Cloud's War and the Great Sioux War. The Battle of the Little Bighorn also took place near the river. By 1883, the Northern Pacific Railroad was completed. This provided rail service along the river to the north entrance of the park.
The river's water is managed for many different purposes. In Montana, the water has been used for irrigation since the 1860s. There are no storage dams on the mainstem of the Yellowstone River. However, there are six low-head diversion dams. These dams supply water to irrigation canals for farmers and ranchers. These include the Huntley Diversion Dam and the Waco Diversion Dam. The watershed also contains five major reservoirs on its tributaries. These are the Boysen, Buffalo Bill, Big Horn, Tongue River, and Lake De Smet reservoirs. 
Today, the river is important for recreation and the environment. In its upper reaches, it is a popular place for fly fishing. 
🖼️ Images & Media (9)
More to explore
✨ What else?
Related topics you might enjoy
🔬 Go deeper
More advanced topics to explore
🪜 Step back
Simpler topics to build understanding
What is Nepedia?
A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.