Rolled in on a Friday evening and snagged the last spot. There are a few coveted spots on the Yellowstone River that are prime. $18 per site, 2 pit toilets, no water, pack out trash. There is a spot to write in a site, so even if you showed up and couldn’t get a picnic table/fire ring I think you’d be okay to post up at an unmarked spot for the night. Beautiful views & shared our site with some curious but shy prairie dogs.