How a thriving California lake became a massive source of toxic dust storms

Countries & Cities · Published 10 October 2026 Swipe more like this →

In short: Once a vital part of a vast Pleistocene water system, Owens Lake was drained in the early 20th century to quench the thirst of Los Angeles. Today, the desiccated basin serves as a cautionary tale, transforming from a glacial remnant into the largest single source of airborne dust pollution in America.

During the Pleistocene Epoch, which spanned from about 3 million to 12,000 years ago, Owens Lake was a significant component of an interconnected river and lake network. Fed by meltwater from alpine glaciers in the Sierra Nevada, it was part of a regional system that included other basins like Searles and China Lake. While those neighboring lakes dried out due to shifting regional climates, the desiccation of Owens Lake was primarily an anthropogenic event. In the early 20th century, the Owens River was diverted to supply water to Los Angeles, located 266 kilometers to the south.

The lakebed was fully dry by 1926, leaving behind a vast salt flat composed of exposed sediments and mineral crusts. This transformation had immediate consequences for the local environment and human health. Residents of the nearby town of Keeler began experiencing intense, airborne dust events they dubbed Keeler fog. These storms are not merely a nuisance; they carry fine, alkaline particles that have been linked to respiratory issues for local populations and reduced visibility in protected wilderness areas and national parks.

In response to the environmental damage, the City of Los Angeles has initiated various efforts to manage dust evolution from the lakebed. Current strategies include shallow flooding of the salt pan and the implementation of managed vegetation, such as saltgrass, to stabilize the surface. Despite these interventions, the lake remains a complex site where springs and seeps support minor wetlands, and halophilic organisms thrive in the margins of the remaining brine pools, illustrating the persistent, albeit altered, ecological activity in this once-submerged landscape.

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