Yes, the Great Salt Lake is shrinking dramatically. The lake hit its lowest recorded level in July 2022, dropping to an average daily elevation of 4,190.1 feet above sea level, breaking a record that had stood since October 2021. That measurement comes from a USGS data record stretching back to 1847. The lake has been losing an average of nearly four inches of depth per year for the past three decades, and the primary driver is not drought alone. Roughly 62% of the river water that historically refilled the lake is now diverted before it ever reaches the shoreline.
Where the Water Goes
The Great Salt Lake has no outlet. It depends entirely on rivers flowing in and rain falling directly on its surface, balanced against evaporation. When humans pull water from those feeder rivers, the lake shrinks. Agriculture accounts for 71% of all human-caused water losses, and within that category, 80% goes to growing cattle-feed crops like alfalfa and grass hay that support nearly a million head of dairy cattle in the region. Municipal and industrial use make up most of the rest.
Climate change compounds the problem by raising temperatures, which increases evaporation from the lake’s surface and reduces snowpack in the mountains that feed its tributaries. But researchers at Northern Arizona University emphasize that human consumption is the larger factor. The math is straightforward: if you divert most of a terminal lake’s inflow, the lake disappears.
What Happens When the Lakebed Is Exposed
As the lake recedes, it exposes hundreds of square miles of dry lakebed. That sediment contains arsenic from both natural geology and decades of human activity, along with lead, copper, thallium, nickel, and other heavy metals deposited by mining, coal burning, and agricultural runoff. When wind sweeps across this exposed ground, it kicks up dust plumes that can reach Salt Lake City and surrounding communities.
Researchers have observed dust plumes coming off the lakebed in concentrations that exceed federal air quality standards for short periods. The Utah Department of Environmental Quality now issues high-wind warnings so residents can go indoors during dust events. Scientists are still working to measure exactly how much arsenic and other toxic particulate matter residents are breathing on a regular basis, but the concern is serious enough that research teams are deploying air monitors to capture and analyze dust samples for chemical signatures tied specifically to the shrinking lake.
This is not a hypothetical risk. The Aral Sea in Central Asia, which dried up through similar agricultural diversions, created toxic dust storms that have been linked to elevated rates of respiratory disease, cancer, and infant mortality in surrounding populations for decades.
Wildlife at Stake
More than 250 bird species use the Great Salt Lake ecosystem each year, making it one of the most important migratory stopovers in the Western Hemisphere. Wilson’s phalaropes, eared grebes, and American avocets depend on the lake’s brine shrimp and brine flies as fuel during long migrations. If those food sources collapse, millions of birds lose a critical refueling point with no comparable alternative nearby.
Brine shrimp can survive in water with salinity ranging from about 3% to 33%. As the lake shrinks, its salinity rises because the same amount of dissolved salt is concentrated in less water. Push past that upper threshold and brine shrimp populations crash, taking the brine fly populations with them. This would not only devastate the bird populations but also eliminate a commercial brine shrimp harvest that is part of a $1.9 billion annual economic contribution the lake makes to Utah’s economy, supporting over 7,700 jobs across mineral extraction, shrimp harvesting, and recreation.
The Gap Between Current Levels and Recovery Targets
Utah’s Great Salt Lake Commissioner has set an official target range of 4,198 to 4,205 feet for the lake’s elevation, with an intermediate milestone of 4,195 feet. The state plans to reach this range within 30 years through annual water conservation targets across agricultural, municipal, and industrial sectors. The problem is scale: the lake’s record low sat around 4,190 feet, meaning the state needs to raise the lake roughly 8 to 15 feet from its worst point. That requires returning enormous volumes of water that are currently being consumed.
Getting there depends on convincing or compensating farmers to use less water, shifting crop choices away from water-intensive alfalfa, investing in efficiency upgrades for irrigation systems, and potentially purchasing water rights to send flows back to the lake. Some of these measures are already underway. Utah has passed legislation creating frameworks for water trading and conservation incentives, and wetter-than-average years in 2023 and 2024 provided some temporary relief. But a couple of good snow years do not reverse a 30-year trend driven by structural overuse of the water supply.
What Recovery Actually Requires
The core challenge is that the lake’s decline is not a natural disaster. It is the predictable result of diverting most of a lake’s water supply to other uses. Reversing it means changing how water is allocated across an entire regional economy. Agriculture will need to use significantly less, which means either fewer irrigated acres, different crops, or dramatically more efficient irrigation methods. Urban growth along the Wasatch Front, one of the fastest-growing metro corridors in the country, adds pressure in the opposite direction.
The 30-year timeline in the state’s strategic plan reflects the difficulty of the task. Water rights in the Western United States are legally complex, economically entrenched, and politically sensitive. Every acre-foot of water returned to the lake is an acre-foot that someone was using for something else. The question is not whether the Great Salt Lake is drying up. It is whether Utah will reallocate enough water to stop it before the ecological and public health consequences become irreversible.