Great Salt Lake

The Great Salt Lake is a big lake.

It is in the state of Utah. Long ago, a much larger lake was here.

Now, the lake is very salty. Rivers bring minerals into the water. The salt makes the water thick. This helps you float when you swim.

Many birds live in the lake. It is a special home for them. The lake can change size quite a bit.

The Great Salt Lake is in Utah. It is the largest saltwater lake in the Western Hemisphere.

Long ago, a giant lake called Lake Bonneville was here. It was ten times larger than the lake today.

As the world warmed, the big lake began to dry up. This left behind the Great Salt Lake.

Three rivers flow into the lake. These are the Jordan, Weber, and Bear rivers. Every year, they bring 1.1 million tons of minerals into the water. The lake has no way to let this water out. Only evaporation, or water turning into vapor, leaves the lake. This makes the water very salty. The salt makes the water dense, which means it is thick. This thickness helps you float when you swim.

The lake is a home for many living things. Millions of birds live there. It is a very important place for birds like the Wilson's phalarope. But the lake is shrinking. Drought and using too much water can make it smaller. Scientists worry the lake could dry up soon.

The Great Salt Lake is a very special place in northern Utah. It is the largest saltwater lake in the Western Hemisphere.

This lake is also the eighth-largest terminal lake in the entire world. A terminal lake is a lake that has no way to flow out. Because the water cannot leave, it stays in one place. This makes the lake very important for the local weather. It can even help create lake-effect snow in the area.

This lake works in a very interesting way. Three major rivers named the Jordan, Weber, and Bear flow into it. Every year, these rivers bring about 1.1 million tons of minerals into the lake.

Since the water only leaves through evaporation, these minerals stay behind. This makes the water very salty and very dense. High density means the water is thick. Because of this, swimming in the lake feels like floating.

Long ago, the lake looked very different. It is a remnant of a huge prehistoric lake called Lake Bonneville. During the Pleistocene Epoch ice ages, Lake Bonneville was much larger. It was nearly as big as Lake Michigan today. It covered much of Utah, Idaho, and Nevada. About 16,800 years ago, a large part of the lake escaped through Red Rock Pass in Idaho. This caused huge floods. As the climate warmed, the rest of the water dried up.

Many people have explored the lake over the years. Silvestre Vélez de Escalante learned about it from the Timpanogos Utes in 1776. Later, Jim Bridger and Etienne Provost saw it in 1824. In 1843, John C. Fremont led the first scientific expedition there. His reports helped Brigham Young choose to settle in the Salt Lake Valley in 1847. In 1850, Howard Stansbury led a full survey of the area. He even named Stansbury Island.

The lake is changing again due to many factors. Drought and using too much water upstream make it shrink. In the 1980s, the lake reached a very high level. To stop flooding, the state built the West Desert Pumping Project in 1987. This project moved water into the desert to help the lake evaporate. However, the lake has also hit very low points recently. In 2021, it fell to its lowest recorded area. Scientists worry about the lake drying up completely.

The Great Salt Lake is a massive body of water in northern Utah. It is the largest saltwater lake in the Western Hemisphere. It is also the eighth-largest terminal lake in the entire world. A terminal lake is a lake that has no outlet. This means water cannot flow out through rivers or streams. Instead, water only leaves the lake through the process of evaporation.

This lack of an outlet creates a unique chemical process. Three major tributaries, the Bear, Weber, and Jordan rivers, flow into the lake. Every year, these rivers deposit approximately 1.1 million tons of minerals into the water. Because the water evaporates but the minerals stay behind, the concentration of salt increases. This results in high salinity, making the lake much saltier than the ocean. This high salt content also increases the water's density. Because the water is so dense, objects like humans can float very easily while swimming.

The lake is actually a small remnant of a much larger prehistoric system. During the Pleistocene Epoch, a massive body of water called Lake Bonneville covered the region. At its peak, Lake Bonneville was nearly as large as Lake Michigan. It was roughly ten times the size of the current Great Salt Lake. The lake covered much of Utah and parts of Idaho and Nevada. About 16,800 years ago, a large portion of this water escaped through Red Rock Pass in Idaho. This event caused cataclysmic floods. As the climate warmed, the remaining water dried up into several smaller lakes.

Human history with the lake involves many different explorers and settlers. In 1776, Silvestre Vélez de Escalante learned of the lake from the Timpanogos Utes. Early maps often confused the Great Salt Lake with Utah Lake. In 1824, Jim Bridger and Etienne Provost observed the lake independently. Later, in 1843, John C. Fremont led the first scientific expedition to the area. His reports influenced Brigham Young to settle the Salt Lake Valley in 1847. In 1850, Howard Stansbury conducted the first comprehensive survey. He even named Stansbury Island during his travels.

The lake's size changes constantly due to water levels and climate. In the 1980s, the lake reached a historic high. This caused flooding and damaged property on the eastern side. To help, the state built the West Desert Pumping Project in 1987. This project used three pumps at Hogup Ridge to move water into the desert. The goal was to increase the surface area to speed up evaporation. The project removed about 120,000 acre-feet of water before it shut down in 1989.

Today, the lake faces significant threats from drought and water diversion. In 2021, the lake fell to its lowest recorded area. This was lower than the previous record set in 1963. Scientists at Brigham Young University estimate the lake could dry up by 2028 without policy changes. Such a loss would impact the local climate and environment. For example, the lake helps create lake-effect snow. Shrinkage could also turn the lake bed into a source of toxic dust. This dust could potentially poison the air near Salt Lake City.

Despite these challenges, the lake remains a vital ecosystem. It provides a habitat for millions of native animals. These include brine shrimp, nematodes, and many types of waterfowl. The lake holds the largest staging population of Wilson's phalarope in the world.

It also supports unique life forms like stromatolites on its shores.

The lake is also a site of human engineering, such as the railroad causeway. This causeway was built in the 1950s by the Morrison-Knudsen company. Today, about 15 trains cross this route every single day.