The poorly drained Toko soils are in deeper and commonly larger depressions and are fine-loamy. Surface runoff is ponded. Permeability is moderately rapid in the solum and moderately slow in the underlying till. A seasonal perched water table is at a depth of 1 foot above the surface to 1.5 feet below the surface at some time during the period of April to June in most years. Corn is the most common crop.
Native vegetation is mainly prairie cordgrass and sedges.
East central South Dakota. The series is moderately extensive. Spink County, South Dakota, 1997.