Yanks Gulch/Upper Greasewood Creek

Location:  Rio Blanco County
Size:   2687 acres
Designated:   March 1988
Land Manager:   Bureau of Land Management

The Yank's Gulch/Upper Greasewood Creek Natural Area supports high-quality examples of three types of Great Basin plant communities:  Mesic pinion-juniper woodland, mesic sagebrush shrubland, and western slope grasslands.  Significant populations of three rare plant species endemic to Green River shale are also found on the site: Physaria obcordata (listed Threatened), Aquilegia barnebyi, and Astragalus lutosus.