Polo soils are well drained soils and are on ridgetops and on side slopes upslope from Sampsel soils. Snead soils are moderately deep and are on steeper slopes below the Sampsel soils. McGirk and Hartville soils have ochric epipedons. McGirk soils are on footslopes and Hartville soils are on stream terraces below the Sampsel soils. Runoff is medium.
Permeability is slow.
In undisturbed areas, a perched water table has an upper limit of 0 to 1.5 feet during November to May in most years. Most areas are cultivated to corn, wheat, and soybeans. Some is used for hay and pasture. Native vegetation was tall prairie grasses. The series is extensive.