Neilson Wash is an unmapped airstrip on BLM land. The runway is roughly 2,800ft long. Note that this area is popular with off-roaders making it likely for vehicles to be on/near the runway.
See [Utah Backcountry Pilots Association](https://utahbackcountrypilots.org/airstrips/NEILSONWASH) for more info and conditions before attempting to land here.