Utah Water Science Center
![]() GREAT SALT LAKE
Utah PROJECTS
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Great Salt Lake, UtahGreat Salt Lake Facts
![]() Great Salt Lake is located on a shallow playa. Consequently, small changes in the water-surface elevation result in large changes in the surface area of the lake. This is particularly evident when the lake spills into the west desert at an elevation of about 4,215 feet, greatly increasing its area. The satellite imagery shows changes in the area of the lake from 1972, through the high-runoff period of 1983-87, and ending in 1996. At the historic average (1847-1986) surface elevation of 4,200 feet (1975 is an "average year" shown in the images), the lake covers an area of about 1,700 square miles. At the historic low elevation of 4,191.35 in 1963, the lake covered only 950 square miles. The drop of about 8.5 feet in elevation resulted in a loss of about 44 percent in surface area. During 1986 and again in 1987, the lake reached an elevation of 4,211.6 feet and had a surface area of about 3,300 square miles. The relation between water-surface elevation and corresponding surface area and volume of the lake is shown on an elevation-area-volume curve, also called a hypsographic curve (from the Greek, hypsos, meaning height).
Great Salt Lake and vicinity, Utah
The map to the left shows Tooele and Salt Lake City. A larger image is available. HydrologyIn addition to measuring changes in lake elevation, since the early 1960s the USGS has conducted detailed studies of the physical and chemical hydrology of the lake. These have included investigations of the prehistory of the lake, general hydrology of closed-basin lakes, effects of human activities on the lake, and a detailed accounting of the water budget.
Salinity and water qualitySalt industry
The picture to the left shows salt ponds. A larger image is available. Industries extracting salt and other minerals from the lake:
EcologyBrine shrimpBrine shrimp are not only the most visible inhabitants of Great Salt Lake and are very important to the ecology of the lake, serving as a major source of food for migratory birds. They are also valuable for the hard-walled eggs they produce, which are commercially harvested and used worldwide in the aquaculture industry. BirdsBirds: Great Salt Lake supports between 2 and 5 million shorebirds, as many as 1.7 million eared grebes, and hundreds of thousands of waterfowl during spring and fall migration. Because of its importance to migratory birds, the lake was designated a part of the Western Hemisphere Shorebird Reserve Network in 1992. The lake and its marshes provide a resting and staging area for the birds, as well as an abundance of brine shrimp and brine flies that serve as food. Planktonic and benthic habitatsThe planktonic and benthic habitatin Great Salt Lake consists of the open water inhabited by brine shrimp, phytoplankton (algae), bacteria, and other small zooplankton. These organisms are all free-swimming or float in the water. The benthic habitat consists of the bottom substrate of the lake and its associated organisms. These organisms are primarily brine-fly larvae and benthic algae. USGS publications about the ecology of Great Salt LakeOther interests on Great Salt LakeBoating and recreationThis is a brief explanation and listing of boating and recreation on Great Salt Lake. Organizations involved with Great Salt Lake
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