Clackamas soils are noncalcareous and are medium and strongly acid. Cordova soils have slightly to strongly acid B2t horizontal. Buntingville soils are on smooth or gently convex slopes of alluvial fans and terraces at elevations of 4,000 to 5,000 feet. Slope gradients range from 0 to 9 percent. The soils formed in loamy alluvium derived primarily from tuffs, andesite, basalt, and tuff breccias.
Climate is cool, semiarid.
Mean annual precipitation ranges from 12 to 16 inches. The mean annual temperature ranges from 48 degrees to 53 degrees F., average January temperature is 28 degrees to 30 degrees F., and average July temperature is 66 degrees to 73 degrees F. Freeze-free season is 90 to 130 days. These are the Bidwell, Bieber, Goose Lake, Modoc, Pit, and Surprise soils. Bidwell soils are well drained and have 8 to 16 inch thick mollic epipedons. Bieber soils have fine textured B2t horizons and duripans.