The moderately well drained Williamstown soils are moderately deep to dense till and are on similar landforms. The moderately well drained Miami soils are moderately deep to dense till and are on more sloping shoulder slopes and back slopes on lower elevations. The poorly drained Treaty soils are very deep and are in depressions. Moderately well drained. The potential for surface water runoff is medium or high.
Permeability is moderately slow in the solum and slow or very slow in the underlying dense till.
An intermittent perched high water table is at a depth of 1 to 2.0 feet in normal years. Most areas are used to grow corn and soybeans. A few areas are used for growing small grain, mainly wheat, and for hay and pasture. Native vegetation is mixed hardwood forest. The series is of moderate extent.