St. Charles soils occupy contiguous areas of similar slopes where loess thickens to greater than 40 inches. Moderately well drained. The potential for surface runoff is low or medium. Permeability is moderate in the solum and moderately slow in the substratum. Mayville soils have a perched seasonal high water table at a depth of 2.0 to 3.5 feet for 1 month or more per year, at some time during November to April, in 6 or more out of 10 years.
Common crops are corn, small grain, and hay.
Some canning crops such as peas and sweet corn are also grown. Native vegetation is primarily deciduous forest. Common trees are northern red oak, white oak, American basswood, sugar maple, white ash, and bitternut hickory. These soils are of moderate extent. Washington County, Wisconsin, 1967.