The Bonneville Salt Flats are what remains of Lake Bonneville, which covered most of the Great Basin during the Pleistocene and then, over thousands of years, dried. What’s left is a crust — five feet deep in some places, less than half an inch in others where the brine has been pumped out for potash mining. The crust cracks in polygonal patterns. It floods in wet winters and dries again in summer. Speed Week happens in late August, when it’s firmest.
What draws people there is the flatness. The absolute, geological flatness — the longest uninterrupted straight line available on the continent, and the corresponding possibility of going faster than anywhere else on it. The land speed record for a wheel-driven vehicle, set in 2018, is 341 miles per hour. For piston engines, 406. For jets, 763, though that was Black Rock Desert in Nevada, because Bonneville keeps shrinking, keeps getting wet, keeps losing the hardness that makes it safe to push something to its limits on top of it.
The salt thins a little every year. Before Speed Week, crews truck in a hundred thousand pounds of loose salt and scatter it over the course. They drag chains to find the hardest line. They stake out the timing lights at measured miles, check the level with instruments, argue about which path through the flat is truest. There’s an entire profession of reading salt.
The cars are the thing the photographs show, but in person what you notice first is the smallness of them against the flat. A streamliner — the long, enclosed, bullet-shaped ones — is maybe twenty feet long, three feet wide, so low-slung that the driver lies almost horizontal inside it, peering forward through a slit or a small periscope. At rest in the paddock it looks like a mistake of scale. Then it’s towed to the starting line and the engine lights and the thing accelerates and within five seconds it’s a sound more than a shape, and within fifteen it’s gone, a white thread of dust extending from where it was.
The paddock is the city, the salt is the country. In the paddock: generators, folding tables, cases of tools, roll-around toolboxes, engine stands, nitrogen tanks, people asleep in lawn chairs at ten in the morning because they’ve been working since two. The smell is nitromethane and something sweeter underneath it, exhaust baked into metal baked in August desert heat. Teams sometimes camp for two weeks before Speed Week even starts, prepping the car, helping prep the surface, checking in with officials. There are families. Children who’ve grown up with this. Old men who’ve been coming since the fifties showing young men their old timing slips, the times in pencil, faded.
Between the paddock and the course there’s a walk across salt that takes about ten minutes. The surface is granular, compact. Your footprints show but don’t sink. After a vehicle passes, the compressed track marks stay for hours — twin lines where the tires or the wheels were, and on either side a bloom of disturbed salt thrown outward. A fast run throws the salt farther. You can read roughly how fast a car went by looking at the throw.
The light. The photographers know. In the first two hours of morning, before the surface dries, the flat becomes a mirror for the sky. A car at a mile out seems to float in a doubled world — above it, blue; below it, the same blue, inverted, the same clouds moving the same way. The mountains ringing the basin appear twice: once at their horizon, once below, reaching down into a sky beneath the salt. A streamliner doing 200 miles per hour across this surface looks like something moving between two atmospheres, neither of them quite real.
As the sun rises and the moisture burns off, the mirror quality goes. By nine the flat is simply white, featureless, blinding if you’re not wearing good lenses. The mountains go flat and hazy. The course markers — orange cones spaced a hundred yards apart for ten miles — are impossible to count because the heat shimmer starts and the far end of the course wobbles. By noon the racers are squinting into something that has no gradient, no shadow, no place for the eye to rest. The course officials sit under canopies and drink water from insulated bottles and watch the empty salt for the next car.
At golden hour it comes back. The shadows of the mountains reach in from the west, long and faintly blue. The salt turns amber, then a deep orange-rust. The teams pack up. The access road fills with trailers and the dust they kick up catches the last light. By the time you’re back on I-80 it’s dark and the flat is invisible, just a vast flatness you can feel to the south, no lights, nothing.
The racing categories multiply. Land speed is not one thing. There are streamliners, lakester, roadster, modified, production, vintage. There are diesel pushers. Motorcycles. Vehicles powered by electric motors whose runs are controversial because they’re so quiet that the timing officials have to listen for the car rather than hear it coming. There are vehicles that qualify as the same platform year after year, evolving incrementally: a frame that was built in 1959 now carrying a different engine, different body panels, different safety equipment, but the same logbook, the same designation.
The rules govern everything — wheel placement, fuel type, body dimensions, cockpit size, rollcage design. The records are held in such narrow categories that sometimes only two or three cars in the world compete for the same one. You could hold a record that took you fifteen years to build a car for and nobody will ever try to beat it. Or somebody will show up next year with something better and your name goes into second place on a list that twelve people in the world follow.
What the drivers describe afterward — the ones who’ve gone fast enough to matter — is a particular quality of concentration that isn’t quite calm and isn’t quite panic. There’s a window at the beginning of a run where you’re still thinking about the surface, whether it’s going to hold, whether the car is tracking straight. Then there’s a second window where there’s no room left for thinking, only input: a shimmy in the steering translated into a correction translated into another correction. At 300 miles per hour, a bad patch of salt — a ridge, a depression, a wet spot — can end a run or end a life. Several have. The cockpit contains everything you are for about forty seconds.
Then the chutes deploy and the world slows and the salt spreads out ahead of you and your hands are still working and then you understand it’s done.
What remains after a Speed Week pass:
The track marks in the salt, twin lines, lasting.
The timing slips that the officials print and hand to the driver: speed in miles per hour, to three decimal places, averaged across a measured mile in each direction.
The sound, briefly, of an engine at full song, already going.