What Lake Bonneville Left Behind
NASA highlights Lake Bonneville’s geological legacy, from ancient floods to modern engineering feats, as scientists test Venus mission instruments in its salt flats.
Ancient Lake Bonneville, nearly as large as Lake Michigan, formed 55,000 years ago in western Utah and parts of Nevada and Idaho. A natural dam at Red Rock Pass held back the lake until about 18,000 years ago, when it breached, unleashing one of North America’s largest floods. The catastrophic event lowered lake levels by over 350 feet in six weeks, reshaping the region’s landscape permanently.
The receding waters left behind vast, flat playas and salt flats rich in minerals like halite and gypsum. These mineral deposits have drawn mining interest, particularly for potash used in fertilizers, visible as rectangular evaporation ponds in satellite imagery. The surrounding terrain includes rugged mountains such as the Silver Island and Newfoundland ranges, composed of ancient sedimentary and igneous rocks formed over hundreds of millions of years.
In June 2026, NASA’s DAVINCI mission team tested cameras and instruments at Crater Island, a site nicknamed 'Venus on Earth' for its geological similarities to Venus. The tests involved capturing near-infrared images and creating 3D maps of rock formations from a helicopter descent, validating techniques for mapping Venus’s Alpha Regio region during the mission’s planned atmospheric descent.
The Bonneville Salt Flats have also been the stage for land speed records, including Andy Green’s 2026 hydrogen-fueled run at 406.320 mph. Nearly two centuries earlier, the Donner-Reed Party struggled crossing the salt crust in 1846, their wagons mired in mud, foreshadowing the challenges of the journey ahead.