Arch rock campground is further up the road from Atlanta campground. It used to be a first come first serve campground, but just this month changed to a reservation system. If a site is not reserved and it is after 3pm, you can pay the iron ranger $10 for the site. Arch rock sites are more scenic than the other campground, but also more primitive with just vault toilet and water spigots distributed throughout the camp. No electricity. Desert big horn sheep do frequent the area. It can be very hot temperature. Sites are only modestly separated with little screening. Though the sites further up the loop are more dispersed. Each site has sun shade, table, fire ring, and 12’x12’ tent pads. No T-Mobile.