Yukon River Basin facts for kids
Quick facts for kids Yukon River Basin |
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The location of the Basin is between Alaska and Yukon Territory
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| Physical characteristics | |
| Main source | Alaska and The Yukon Territory |
| Basin features | |
| River system | Yukon River |
| Basin size | 330,000 square miles (850,000 km2) |
| Population | 126,000 indigenous peoples |
The Yukon River Basin is a huge area of land and water. It is located in Canada (Yukon Territory and a small part of British Columbia) and Alaska. This basin is like a giant funnel. It collects water from 13 smaller basins and many rivers. All this water then flows into the Yukon River.
The Yukon River Basin is about 330,000 square miles (850,000 km²) in size. It stretches for about 1,980 miles (3,190 km). This area has many different types of land. You can find various terrains, shrublands, and rivers here. It is still a very natural place, full of salmon. These fish are important for local people's food and jobs.
Contents
A Look Back: History of the Yukon Basin
Some of the first people in North America lived in the western part of the Yukon Basin. They traveled across a land bridge called Beringia many years ago. These early people lived on their own for hundreds of years.
European explorers started coming to the Yukon River Basin in the mid-1800s. One of the first was Robert Campbell in 1840. These early explorers were looking for furs, not gold. Later, in the 1870s, explorers like Leroy McQuesten and Arthur Harper found many valuable minerals. Their mining grew until they reached the Stewart River. There, they found gold, which started the famous Klondike Gold Rush.
Exploring the Yukon Basin's Geography
The Yukon River Basin is huge, covering about 330,000 square miles (850,000 km²). It is also very long, about 1,980 miles (3,190 km). This makes it the fourth largest river basin in North America! It sits between the Rocky Mountains to the north and the Pacific Mountain system to the south.
The basin is found in the Yukon Territory in Canada and Alaska in the USA. It has 13 smaller basins inside it. The land here is very varied. There are five main physical regions with different heights. These include:
- Alaska Range: Mountains that are 6,000 to 9,000 feet (1,800–2,700 m) high.
- Central and Eastern Brooks Range: Mountains 7,000 to 8,000 feet (2,100–2,400 m) high.
- Indian River Uplands: Hills that are 1,500 to 2,000 feet (460–610 m) high.
- Innoko Lowlands: Flat flood plains.
- Kolkrine-Hodzana Highlands: Hills that are 2,000 to 4,000 feet (610–1,200 m) high.
Rocks and Land: Geology of the Basin
Half of the Yukon River Basin is in Canada, and the other half is in Alaska. This area has many different types of land and rocks. You can find sedimentary, igneous, and metamorphic rocks here.
The basin also has many different types of land. These include forests (like needleleaf and broadleaf), shrublands, grasslands, and areas with lichens. There are also many types of soils.
A lot of the Yukon River Basin has Permafrost. This is ground that stays frozen all year round. Because of this, the basin can have sudden floods. When permafrost melts, it can also cause the river's flow to increase. This leads to more erosion of the land.
Water Flow: Hydrology of the Basin
The water in the Yukon River Basin flows from east to west. The water gets warmer as it flows downstream. The water, fish, and other animals in the basin are very important to the local people. So, checking the water quality often is very important.
Because it is so far north, the Yukon River Basin is frozen for almost eight months of the year.
Weather and Climate in the Yukon Basin
The weather in the Yukon River Basin changes a lot. This is because it's a very large area with different types of land. It covers parts of Alaska and the Yukon Territory in Canada.
On average, the basin gets about 19 inches (48 cm) of precipitation (rain and snow) each year. Some areas get less than 10 inches (25 cm), while others get up to 50 inches (130 cm). Taller mountains usually get more rain than flat lowlands. The average temperature in summer is about 30°C (86°F). In winter, it can drop to about -40°C (-40°F). This area has some of the biggest temperature changes for a place in a continental zone.
Climate Change and the Yukon Basin
Studies show that temperatures in the Yukon River Basin have been rising since the 1840s. Climate change is a big issue here. Warmer, drier weather has led to more forest fires. It also causes permafrost to melt, which changes how water flows.
For example, in 2009, there was a lot of flooding. This happened because there was more snow and ice than usual, followed by very warm spring temperatures. The fast melting caused floods, erosion, and damage along the river. Climate change affects the entire river system.
Life in the Yukon Basin: Ecosystems
The Yukon River Basin has a very healthy ecosystem. It is a great home for many birds, mammals, fish, and other creatures. Only one type of amphibian, the wood frog, can live here. This frog has a special "antifreeze" in its cells. This helps it survive the extremely cold winters.
The basin has thousands of lakes, ponds, wetlands, and rivers. These provide homes for many animals. There are over 150 bird species and 40 mammal species. About 1.5 million ducks breed here every year! The basin is also famous for having the longest salmon runs in history.
Plant life includes white spruce, paper birch, and quaking aspen trees. You can also find willow and alder bushes, grasslands, and meadows. These plants help the animals in the ecosystem to thrive.
Amazing Salmon: Life Cycle and Importance
The Yukon River Basin is known for the longest salmon runs in history. Salmon from this area are very special. Their meat is rich and oily. This is because they build up a lot of fat. They need this fat for their long journey up the Yukon River. Some of these valuable salmon include chinook, coho, and chum salmon.
These salmon are not just important for food. They are also a big part of the local economy. People in the villages dry, smoke, and freeze the salmon. Without these salmon runs, the ecosystem might not be as healthy. So, the fisheries are carefully managed. This is done by the Alaska Department of Fish and Game and other groups.
Scientists have studied how salmon migrate. In one study, they tagged adult wild chinook salmon with radio transmitters. This helped them track the salmon's journey up the river. This information helps them keep an eye on the salmon population.
| Category (year) | 2002 | 2003 | 2004 | All Years |
|---|---|---|---|---|
| Start of Tagging | 9 June | 3 June | 3 June | 3-9 June |
| End of Tagging | 13 July | 14 July | 19 July | 13-19 July |
| Captured | 1,310 | 2,312 | 2,107 | 5,729 |
| Tagged | 768 | 1,097 | 995 | 2,860 |
| Moved Up River | 751 | 1,081 | 958 | 2,790 |
| Tracked Past Multiple Stations | 683 | 1,050 | 893 | 2,626 |
| Typical Pattern | 666 | 1,031 | 863 | 2,560 |
This table shows data about how Chinook salmon move in the Yukon River.
People of the Yukon Basin: Demographics
The Yukon River Basin is home to about 126,000 people. There are 4 towns or cities and 43 villages. About 10% of the people still live directly off the land. A large part, 83%, are Indigenous people.
The towns of Dawson and Faro have about 1,000 to 2,000 residents each. The city of Whitehorse has over 23,000 residents. Fairbanks is larger, with around 84,000 residents. Villages around the basin are smaller, with 30 to 800 people.
