The questions people actually ask about Great Salt Lake, answered from the same cited research that grounds this Watch's chat — and the chat can go deeper on any of them.
South arm (Saltair) is at 4189.9 ft (NGVD29), down 0.5 ft over 30 days — 8.1 ft below the healthy range.
The Great Salt Lake Data Watch dashboard shows live water level for Great Salt Lake with full historical context, tributary inflows, weather on the water, curated news and photos, and a grounded AI assistant that answers questions from the live data on the page.
It is remarkably shallow for its size: at typical levels it averages only about 13-16 feet deep, with a maximum of roughly 33-35 feet. Because it sits in a broad, nearly flat basin, small changes in water level translate into very large changes in surface area, so depth depends on the current elevation and the shoreline can shift miles between wet and dry years.
The Great Salt Lake is the shrunken remnant of Lake Bonneville, a vast Ice Age freshwater lake that at its peak covered around 20,000 square miles and reached depths near 1,000 feet. About 14,500 years ago Bonneville breached its rim at Red Rock Pass in Idaho, and continued warming and drying evaporated most of what remained; today's lake took roughly its modern form about 11,000 years ago.
It is a terminal lake with no outlet, so minerals delivered by rivers concentrate as water evaporates, making it far saltier than the ocean's roughly 3.5 percent. A railroad causeway built in 1959 splits it into two arms: the north arm is often near salt saturation at roughly 25-32 percent, while the south arm, which receives most river inflow, averages around 12 percent.
More than 10 million migratory birds of roughly 250-330 species use the lake each year, feeding on its brine shrimp and brine flies, which makes it a hemispherically important stop on the Pacific and Central flyways. Those food species thrive only within a salinity window; when salinity climbs roughly above 15-18 percent in the south arm, algae collapse and brine shrimp fail to reproduce.
As of September 7, 2026, Great Salt Lake is at 4,189.9 ft, 1.4 ft above the all-time record low. Human water use is the dominant reason. Research led by Wayne Wurtsbaugh estimated that upstream diversions, mostly for agriculture, have lowered the lake by about 11 feet compared with an undeveloped baseline, and roughly 40 percent of river water that would reach the lake is consumed before it arrives. That analysis concluded consumptive use, not drought alone, drives the long-term decline.
The exposed lakebed sediments contain elevated levels of metals including arsenic and lead, and University of Utah and Utah State University studies report the dust can carry more reactive, bioavailable metals than many other regional sources. Much of the playa is currently held down by a natural mineral crust, but that protection can break down, and the full health impact is still an active research area.
A widely cited study estimated the lake contributes about 1.3 billion dollars a year to Utah, supporting thousands of jobs. Roughly 1.1 billion comes from mineral extraction such as magnesium and potash, the brine shrimp cyst harvest generates on the order of 50-60 million dollars a year and supplies an estimated 35-45 percent of the global supply, and recreation adds roughly 130 million.
Yes, but its role is often overstated. When cold air crosses the relatively warm lake it picks up heat and moisture, forming snow bands that can hit the Wasatch resorts, and estimates suggest lake-effect events contribute somewhere in the range of 5-10 percent of annual snowfall in the most-favored areas. Most Wasatch snow comes from regular Pacific storm systems.
The lake is Utah state sovereign land, managed by the Department of Natural Resources, mainly through the Division of Forestry, Fire and State Lands; in 2023 the Legislature created the Office of the Great Salt Lake Commissioner to coordinate a statewide effort. The Commissioner's January 2024 strategic plan adopts a healthy elevation range of roughly 4,198 to 4,205 feet above sea level.
Built by Daniel P. Ames, PhD — Civil & Environmental Engineering.