Barry, Berville, Brookston, Jameston and Navan soils are slightly acid to mildly alkaline in the solum. Buntingville soils have secondary lime at depth of 20 inches and lack rock fragments. Marengo soils have a solum over 40 inches thick. Cordova, Hamel and Rensselaer soils are calcareous in the lower part. Millgrove soils are slightly to mildly alkaline in the B horizon.
Westland soils are neutral to moderately alkaline in the lower part of the B horizon.
The Clackamas soils are on level to gently rolling terraces at elevations of 175 to 700 feet. Slope gradients range from 0 to 3 percent. The soils formed in gravelly moderately fine textured mixed alluvium. The climate is characterized by having dry, cool summers and cool, wet winters. The mean annual precipitation is 40 to 60 inches.