It ranges from slightly alkaline to strongly alkaline. Accumulations of gypsum crystals and other salts range from few to many. These are the Promise soils. Promise soils do not have salts in the B horizon. Bullcreek soils are on level to moderately sloping upland valleys, alluvial fans and stream terraces.
Many areas have slight gilgai microrelief.
Slopes typically are less than 3 percent but range from 0 to 9 percent. They formed in dense clayey alluvium. Mean annual air temperature ranges from 45 to 50 degrees F, and the mean annual precipitation ranges from 15 to 24 inches. These are the competing Promise soils and the Chantier, Opal, Sansarc and Wendte soils. Promise, Chantier, Opal and Sansarc soils are on adjacent higher uplands.