If you can take I-90, west, most people think you’d be downright crazy taking Highway 18, a meandering two-lane-r that slows through small towns you’d never otherwise notice. Highway 18 barely deserves the word highway.
But if you’re crazy enough to wander and you have the time, you could do worse than score a big sky sunset some late afternoon over Hwy. 18. It’ll take you through endless reservation lands, two of them—the Rosebud and Pine Ridge—side by side in the lower echelon of west river South Dakota counties.