Wildlife, air quality at risk as Great Salt Lake recedes
SALT LAKE CITY— The silvery blue waters of the Great Salt Lake sprawl across the Utah desert, having covered an area nearly the size of Delaware for much of history. For years, though, the largest natural lake west of the Mississippi River has been shrinking. And a drought gripping the American West could make this year the worst yet.
The receding water is already affecting the nesting spot of pelicans that are among the millions of birds dependent on the lake. Sailboats have been hoisted out of the water to keep them from getting stuck in the mud. More dry lake bed getting exposed could send arseniclaced dust into the air that millions breathe.
“A lot us have been talking about the lake as flatlining,” said Lynn de Freitas, executive director of Friends of the Great Salt Lake.
The lake’s levels are expected to hit a 170year low this year. It comes as the drought has the U.S. West coping with already low reservoirs. Utah Gov. Spencer Cox, a Republican, has begged people to cut back on lawn watering and “pray for rain.”
For the Great Salt Lake, though, it is only the latest challenge. People for years have been diverting water from rivers that flow into the lake to water crops and supply homes. Because the lake is shallow — about 35 feet at its deepest point — less water quickly translates to receding shorelines.
The water that remains stretches across a chunk of northern Utah, with highways on one end and remote land on the other. A resort — long since closed — once drew sunbathers who would float like corks in the extra salty waters. Picnic tables once a quick stroll from the shore are now a 10minute walk away.
The waves have been replaced by a dry, gravelly lake bed that’s grown to 750 square miles. Winds can whip up dust from the dry lake bed that is laced with naturally occurring arsenic, said Kevin Perry, a University of Utah atmospheric scientist. It blows through a region that already has some of the dirtiest wintertime air in the country because of seasonal geographic conditions that trap pollution between the mountains.
Perry warns of what happened at California’s Owens Lake, which was pumped dry to feed thirsty Los Angeles and created a dust bowl that cost millions of dollars to tamp down. The Great Salt Lake is much larger and closer to a populated area, Perry said.
Luckily, much of the bed of Utah’s giant lake has a crust that makes it tougher for dust to blow. Perry is researching how long the protective crust will last and how dangerous the soil’s arsenic might be to people.
This year is primed to be especially bleak. Utah is one of the driest states in the country, and most of its water comes from snowfall. The snowpack was below normal last winter and the soil was dry, meaning much of the melted snow that flowed down the mountains soaked into the ground.