Slopes range from 0 to 5 percent and most areas are weakly dissected, resulting in broad, gentle undulations. Mean annual temperature ranges from 52 to 57 degrees F, and mean annual precipitation ranges from 34 to 37 inches. These include the Haymond , Wilbur , Belknap , Dameron and Cedargap soils on lower flood plains, Twomile soils on similar positions and the Freeburg and Okaw soils on terraces. The flood plain soils do not have argillic horizons. Freeburg, Twomile and Okaw soils are somewhat poorly or poorly drained.
Permeability is moderate.
Runoff potential is negligible to low. In undisturbed areas the upper depth of an apparent water table is at 3.5 to 5 feet during November to April in most years. Flooding is none, rare, or occasional. Most areas are used for growing row crops, hayland or pasture. Native vegetation is hardwood forest.