Bonneville Salt Flats

Access from I-80

The Bonneville Salt Flats Special Recreation Management Area is managed by the BLM Salt Lake Field Office on the western edge of the Great Salt Lake basin in Tooele County, about one hundred twenty miles west of Salt Lake City near Wendover. From Interstate 80 take Exit 4 (Bonneville Speedway). Head north, follow signs toward the Speedway, then turn right on Leppy Pass Road toward the flats. A parking area sits at the end of the road. Driving onto the crust is allowed when the surface is dry and free of seasonal or event closure.

Day-use is free for general public recreation. No overnight camping is allowed on the salt itself. Dispersed camping is available on adjacent BLM land off the approach roads. Services — fuel, food, lodging — are in Wendover, Utah, and West Wendover, Nevada, a few minutes west on I-80. There is no visitor center on the flats. The Salt Lake Field Office handles permits and event questions from the city.

The salt flats run roughly twelve miles long and five miles wide — about thirty thousand acres, just over forty-six square miles. Near the center the crust can approach five feet thick; it tapers to less than an inch at the edges. Volume estimates run on the order of one hundred forty-seven million tons of salt, about ninety percent sodium chloride. Like Great Salt Lake, the crust is a remnant of Pleistocene Lake Bonneville, which covered more than a third of Utah between roughly ten thousand and thirty-two thousand years ago.

Seasonal wet closure and race-week blackout

Motor vehicle use shuts down seasonally in spring when the salt is moist or standing water covers the surface. Closure dates vary with weather and are posted on-site and through BLM. Driving on wet or flooded salt damages the crust and is prohibited. When the surface is soft, even walking leaves long-lasting tracks. Treat wet salt as closed.

Land-speed racing and other permitted events take exclusive use of large portions of the flats for multi-day windows each summer and early fall. During those periods the salt is closed to the general public except for limited pedestrian access near the portal — often capped at about one hundred feet onto the salt for photos. Paved approach roads and the parking area may remain open while the racing surface is closed. Event calendars shift yearly; check the BLM visit page and current announcements before a long drive from Salt Lake or Reno. Organized races, film shoots, and large commercial uses require Special Recreation Permits from the Salt Lake Field Office.

Racing heritage, trail history, and salt replenishment

Land-speed use dates to the early twentieth century. W.D. Rishel scouted a bicycle course across the flats in 1896; Teddy Tezlaff’s Blitzen Benz set an unofficial mark near 142 mph in 1914. Utah native Ab Jenkins and the Mormon Meteor endurance runs of the 1930s, followed by Sir Malcolm Campbell’s 1935 visits, cemented Bonneville as the international straightaway. By 1949 the course was the standard for world land-speed records. Successive barriers at 300, 400, 500, and 600 mph fell here. The flats are listed for their contribution to that racing history and are also designated an Area of Critical Environmental Concern.

People and wagons crossed long before the racers. Jedediah Smith crossed while returning from California in 1827. John C. Frémont’s 1845 expedition tested a shorter overland route; the next year that alignment became the Hastings Cutoff on the California Trail. The Donner-Reed Party of 1846 lost critical days when wagons mired in mud beneath the thin crust — delay that contributed to their later Sierra winter disaster. Artifacts from that crossing are interpreted at the Donner-Reed Museum in the region. NPS California National Historic Trail materials treat the flats as part of that story.

Industry and racers share concern about crust thinning. Through cooperative salt-laydown work, potash operations (currently Intrepid Wendover Potash) produce brine over winter and pump concentrated salt water onto the southern flats in spring so it recrystallizes as temperatures rise. The work is imperfect science and ongoing management. That is why industrial canals and discharge sit near the access road in the same views as the pure white horizon.

For photography, the classic infinite-horizon look needs dry crust, clear air, and often early or late light. Summer event blackouts and spring flooding cancel more visits than anything else. If the salt is closed, the I-80 rest areas still give a distant view of the white plain. Confirm conditions with BLM before counting on a walk or drive onto the crust.