What the Bonneville Salt Flats do to a vehicle.

Getting there without getting stuck

The public way onto the flats is the paved BLM access road from I-80 exit 4, about five miles to the parking area. The BLM keeps the flats generally open but closes them to vehicles in spring while the salt is moist or has standing water, with the dates posted by sign. Its warnings are blunt: the salt crust is much thinner near the edges, wet crust can break under the weight of a car, a vehicle may become suddenly stuck in the underlying mud, and getting stuck out there has resulted in fatalities. Don't drive on salt that's under water, and don't drive to the edge to get the photo.

The racing calendar closes the flats too. In 2026 the BLM listed Speed Week from July 27 to August 8, a private event August 9 to 15, the motorcycle trials August 20 to 28, World of Speed August 30 to September 8, and the World Finals September 23 to 29. During an event, visitors can go about 100 feet onto the salt from the portal sign and no further.

What the salt is

The BLM describes the crust as comprised mostly of sodium chloride, table salt. Underneath and around it is brine that the Utah Geological Survey describes as chlorides and sulfates of sodium, potassium and magnesium; potash has been pulled out of it since 1917, and spring salt brine is discharged onto the southern section of the flats near the access road. So what your tires throw into the wheel wells is chloride salt, with magnesium in it, and it's the chloride that does the damage.

What it does to the vehicle

Chloride plus moisture is the corrosion recipe. NASA's corrosion reference explains the two things that matter here: where aluminum or magnesium parts touch steel, galvanic corrosion accelerates the corrosion of the aluminum or magnesium, and pitting is most likely to occur in the presence of chloride ions. A detailing manufacturer's road-salt guidance describes where it lands and what it does: wheel wells, brake lines, undercarriages and suspension components take the hits, mixed with moisture the residue becomes highly corrosive and accelerates rust on exposed metal, it works its way into seams where rust forms quietly, door seals and window trim dry out and crack, and lingering residue can leave pale, chalky blotches in the paint. Inside, salt bonds to carpet fibers and moisture pulls it back to the surface, which is why a salt stain reappears after it's been wiped.

What to do the same day

The BLM says wash it off; it doesn't say when, so we will: the same day, before it dries in. Rinse the underbody, the wheel wells, the brake components and the suspension with fresh water until it runs clear, then wash the paint. Open the doors and rinse the sills and seals. If salt got inside on shoes or gear, the carpet needs a wet extraction, not a vacuum, because dry salt in the fibers keeps drawing moisture. A detail after a salt flats trip is the only one we'd call maintenance rather than cleaning.