Lake Bonneville
At one point, Great Salt Lake State Park was part of what is now known as the ancient Lake Bonneville. During this period in time, over 20 million years ago, the area was covered by a large lake that stretched from Utah to Idaho and Nevada. This lake maintained its size for thousands of years until it began to dry up about 14,000 years ago due to a combination of climatic conditions. The remains of this lake are now visible as the Great Salt Lake, and what remains is an impressive example of geological history.
The unique nature of Lake Bonneville is due to the fact that it was formed by a combination of three separate geologic processes. The first process, known as “orographic lifting”, created the topography which led to the lake's formation. This process caused rocks and other materials to be pushed up from the bottom of the lake, creating ridges and troughs in the landscape. The second process, known as “drainage”, caused water to be drawn away from the lake by rivers and streams. The third process, known as “desiccation”, slowly dried up the lake until it eventually became what is now Great Salt Lake State Park.

The Great Salt Lake
The Great Salt Lake itself is a remnant of the much larger ancient Lake Bonneville and is the largest saltwater lake in the western hemisphere. It has several islands, including Antelope Island, Fremont Island, and Stansbury Island. Its area covers nearly 2,000 square miles, making it bigger than Rhode Island and Delaware combined. The salinity of the lake varies depending on location, but it’s generally between 6 and 27%. Due to the high salt content, the water has a slightly blue-green tint.
The lake is also home to a variety of birds and wildlife, including pelicans, gulls, American white pelicans, herons, and great egrets. It’s also an important stopover for migratory birds. Additionally, the lake provides habitat for several species of fish, including whitefish and carp.
The Great Salt Lake is perhaps most famous for its salt production. The high salinity of the lake makes it a prime location to extract salt, which is then used in a variety of industries from food processing to manufacturing. The lake is also used for recreation, including fishing, boating, and birdwatching.