Water volume on the Great Salt Lake has dropped by more than two-thirds since pioneers once settled the Salt Lake Valley. Much of the lake surface is now exposed. This fall, water levels fell to all-time lows.
Photographs of empty marinas and the cracking crust of the lake’s surface often illustrate the lake’s decline. But perhaps the most concerning symptom lies beneath the surface of what little water is left. The lake’s salinity levels have risen dramatically in recent years, nearing dangerous thresholds for the creatures at the base of its food web.
“As the lake goes down, water evaporates but salts are left behind,” said Wayne Wurtsbaugh, a professor emeritus of water sciences at Utah State University. “We’re getting to the level where high salinity is stressing organisms that are adapted to that environment — that’s mainly brine flies and brine shrimp.”
About 10 million migratory birds—some 338 species—depend on the lake’s habitat to survive.
“We could see nonlinear collapses of food webs, and that’s going to happen before the lake disappears,” said Ben Abbott, a Brigham Young University professor who led the scientific group that’s warned of an emergency.
Brine shrimp are a critical food source for the aquaculture industry. Low water levels threaten other economic staples, too. The lake’s decline pushed US Magnesium, the country’s largest magnesium producer, to apply to extend canals that are used to take in and evaporate lake brine to mine the metal. The Utah Department of Environmental Quality denied its application late last year.
In the meantime, unhealthy dust from the lake’s dried surface — which contains arsenic and other heavy metals — blows into communities near the lake, threatening more than 2 million residents in a region already struggling with the quality of its air..
State officials in recent years have awakened to the lake’s problem—that upstream water use strangles the terminal lake. The rivers and streams that feed the Great Salt Lake are overallocated, which means farmers and other water users collectively have rights to more water than what typically flows through each year. The amount of water that reaches the lake, particularly during a drought, is insufficient.
Last year, lawmakers passed several bills designed to reshape the state’s relationship with water. One bill created a water trust designed to benefit the lake and its wetlands. The Nature Conservancy and Audobon Society were designated to lead the trust, which received $40 million from the Legislature. Another bill makes it a “beneficial use” for farmers to allow water to flow to the lake. Previously, not using all of the allotted water risked losing future use of that water.
Separately, Utah Gov. Spencer Cox last November closed the Great Salt Lake basin to appropriations for new water uses, effectively capping the line of water users wanting to use what flows into the lake.
The recent report from scientists and conservationists says those measures are not enough, and that the impacts of those measures would take too long and that a concerted effort to rescue the lake was needed.
“The lake needs water this year,” Abbott said.
Lawmakers say they’re poised to shower the problem with new funding.
Last session, “we passed significant pieces of legislation that gave us the tools to help us save the lake,” said Casey Snider, a Republican state representative. “This session, we now have the option to pull funding levers.”
Cox, in his annual budget, included $132.9 million for the lake, incorporating $100 million for short-term water leases to “shepherd” agricultural water to the lake, and another $217.9 million for statewide water conservation and supply measures.
“We will do more than that. I’m confident. Probably significantly more,” said Utah House Speaker Brad Wilson. “There’s probably no issue more important than investing in and supporting our water strategy for the lake.”
